Orion Benchtop pH/Conductivity Meter - Cole-Parmer-27… · pH mV mS/cm rdy pH man ppt mg/L MΩ- cm...

Analyze • Detect • Measure • Control™

Orion BenchtoppH/Conductivity Meter

I N S T R U C T I O N M A N U A L

Orion 550A

pH/ORP/Cond

Orion 550A

AQUAfast, Cahn, EZ Flash, Ionalyzer, ionplus, KNIpHE, No Cal, ORION, perpHect, PerpHecT, PerpHecTion, pHISA, pHix, pHuture, Pure Water, Sage, Sensing the Future, SensorLink, ROSS Ultra, Sure-Flow, TEA Analyzer, Titrator PLUS, TURBO2 and Wine Master are registered trademarks of Thermo Electron Corporation.

1-888-pHAX-ION, A+, All in One, Aplus, AQUAsnap, AssuredAccuracy, AUTO-BAR, AUTO-CAL, AUTO DISPENSER, Auto-ID, AUTO-LOG, AUTO-READ, AUTO-STIR, Auto-Test, BOD AutoEZ, Cable-Free, CERTI-CAL, CISA, DataCOLLECT, DataPLUS, digital LogR, DirectCal, DuraProbe, Environmental Product Authority, Extra Easy/Extra Value, FAST QC, Flash Titration, Flash Titrator, GAP, GLPcal, GLPcheck, GLPdoc, ISEasy, KAP, LabConnect, LogR, Low Maintenance Triode, Minimum Stir Requirement, MSR, NISS, One-Touch, One-Touch Calibration, One-Touch Measurement, Optimum Results, Pentrode, pHuture MMS, pHuture Pentrode, pHuture Quatrode, pHuture Triode, Quatrode, QuiKcheK, rf link, ROSS, ROSS Resolution, SAOB, Smart CheK, Stacked, Stat Face, The Enhanced Lab, ThermaSense, Triode, TRIUMpH, Unbreakable pH, Universal Access are trademarks of Thermo.

Guaranteed Success and The Technical Edge are service marks of Thermo.

PerpHecT meters are protected by U.S. patent 6,168,707.

PerpHecT ROSS are protected by U.S. patent 6,168,707.

ORION Series A meters and 900A printer are protected by U.S. patents 5,108,578, 5,198,093, and German patents D334,208 and D346,753.

Sure-Flow electrodes are protected by European Patent 278,979 and Canadian Patent 1,286,720.

ionplus electrodes and Optimum Results solutions are protected by US Patent 5,830,338.

ROSS Ultra electrodes have patents pending.

ORION ORP Standard is protected by US Patent 6,350,367.

ORION Series A conductivity meters are protected by US Patent 5,872,454.

© Copyright 2003, Thermo Electron Corporation. All rights reserved. Question everything, and Analyze. Detect. Measure. Control are trademarks of Thermo Electron Corporation.

The specifications, descriptions, drawings, ordering information and part numbers within this document are subject to change without notice.

This publication supersedes all previous publications on this subject.

Table of ContentsCHAPTER I.

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

CHAPTER II.MEASUREMENT THEORY . . . . . . . . . . . . . . . . . . . . . 3pH MEASUREMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3CONDUCTIVITY MEASUREMENT . . . . . . . . . . . . . . . . . . . . 5CELL CONSTANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6TEMPERATURE EFFECTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 8SALINITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9TOTAL DISSOLVED SOLIDS . . . . . . . . . . . . . . . . . . . . . . . . . 10RESISTIVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11CONDUCTIVITY STANDARD VALUES . . . . . . . . . . . . . . . . 11

CHAPTER III.GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 15INSTRUMENT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . 15

CHAPTER IV.SYSTEM SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Self-Diagnostics Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

SETUP MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CHAPTER V.OPERATION MEASUREMENT . . . . . . . . . . . . . . . . . . 25AUTOMATIC SHUTOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27pH CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Autocalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Manual pH Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Multipoint pH Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

CONDUCTIVITY CALIBRATION . . . . . . . . . . . . . . . . . . . . . 30Determination of the Cell Constant . . . . . . . . . . . . . . . . . . . . . 30Manual Calibration - The Cell Constant Adjustment Method . . 31

AutoCal™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32DirectCal™ Direct Calibration Method . . . . . . . . . . . . . . . . . 34Multipoint Calibration Method . . . . . . . . . . . . . . . . . . . . . . . 35Auto Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Temperature Compensation and Measurement . . . . . . . . . . . 36

Orion Benchtop pH/Conductivity Meter Instruction Manual

Temperature Coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Reference Temperature (rEF) . . . . . . . . . . . . . . . . . . . . . . . . 37Automatic Temperature Compensation . . . . . . . . . . . . . . . . . 38Manual Temperature Compensation . . . . . . . . . . . . . . . . . . . 38No Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . 39Measurement with an External Temperature Prob . . . . . . . . 39

Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Manual Storage of Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Automatic Storage of Data . . . . . . . . . . . . . . . . . . . . . . . . . . 40Readout of Stored Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Printing of Stored Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41Erasure of Stored Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Print Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Manual Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Automatic Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

CHAPTER VI.USE WITH PRINTERS AND COMPUTERS . . . . . . . . . 49USE WITH ORION PRINTERS . . . . . . . . . . . . . . . . . . . . . . . . 50

CHAPTER VII.ORION 550A REMOTE CONTROL COMPUTER COMMANDS . . . . . . . . . . . . . . . . . . . . . . 51USER COMMANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

CHAPTER VIII.TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 57

CHAPTER IX.ASSISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

CHAPTER X.WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

CHAPTER XI.NOTICE OF COMPLIANCE . . . . . . . . . . . . . . . . . . . . . 65

CHAPTER XII.SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67METER PERFORMANCE SPECIFICATIONS . . . . . . . . . . . . 67

CHAPTER XIII.ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . 69



Introduction 1

Chapter I.IntroductionThe Orion 550A pH/Conductivity Meter is a full-featured meter, which canbe used for a wide variety of applications. Water quality, salinity, acids,bases and other samples can be easily analyzed for pH, mV, conductivity,resistivity, salinity, and total dissolved solids.

This meter features microprocessor design, which automates complicatedand time consuming calibration and measurement procedures for a widevariety of applications.

Orion’s new DirectCal™ conductivity calibration technique allowscalibration by direct input of actual calibration standard conductivityvalues, eliminating iterative adjustments of cell constants. Orion’s newAutoCal™ conductivity calibration technique features automatic recognitionof Orion conductivity standards. A wide variety of cells, conductivity andTDS standards and accessories are available.

FIGURE 1 - Orion 550A

printautoyeslog viewlog

log clrcalmodesetup

pH/conductivity Orion 550A

rdy cond

cal TC

pH

mV

mS/cm

rdy pH

man

ppt

mg/L

MΩ - cm µS/cm

C

2



Measurement Theory 3

Chapter II.Measurement TheorypH MeasurementpH is one of the most common laboratory measurements because manychemical processes are dependent on pH. The speed or rate of chemicalreactions can often be significantly altered by changing the pH of thesolution. The solubility of many chemicals in solution, and their bio-availability is dependent on pH. The physiological chemistry of livingorganisms usually has very specific pH boundaries. In our modern lives,virtually everything we use has been monitored for pH at one time: fromthe tap water we use to bush our teeth to the medicines we take, at somepoint a pH measurement was performed.

The term pH derives from a combination of “p” for the word power and“H” for the symbol of the element Hydrogen. Together the meaning is thepower or exponent of Hydrogen.

pH electrodes measure the pH of a solution potentiometrically. Apotentiometric measurement relies on an electrical signal. When a pHsensing electrode comes in contact with a sample, a potential developsacross the sensing membrane surface. The membrane potential varies withthe pH. Making a measurement requires a second unvarying potential toquantitatively compare the changes of the sensing membrane potential. Areference electrode provides this function. Electrode behavior is describedby the Nernst equation: Emeasured =E0 + (2.3RT/nF) log aH+ Emeasured is themeasured potential from the sensing electrode, E0 is related to the potentialof the reference electrode, (2.3 RT/nF) is the Nernst factor, and log aH+ isthe pH. The Nernst factor, 2.3 RT/nF, includes the Gas Law constant (R),Faraday’s constant (F), the temperature in degrees Kelvin (T) and thecharge of the ion (n). For pH, where n=1, the Nernst factor is 2.3 RT/nF.Since R and F are constants, the factor and therefore electrode behavior isdependent on temperature. The electrode slope is a measure of theelectrode response to the ion being detected and is equivalent to the Nernstfactor. When the temperature is equal to 25 ˚C, the Nernst factor or slopeis 59.16 mV/pH unit. Most Orion pH meters display the slope as apercentage of the theoretical value. For example, a 98.5% slope isequivalent to a slope of 58.27 mV/pH unit for a two-point calibration.


Measurement Theory4

When a pH meter detects the sensing membrane signal, reference signaland the temperature, the meter software calculates the pH using the Nernstequation. Orion microprocessor controlled pH meters contain pH versustemperature values for commonly used buffers. This allows the meter torecognize a particular pH buffer and calibrate with the correct value at thattemperature.

The Orion 550A utilizes a “point-to-point” scheme for multipointcalibrations in both pH and conductivity modes. In this technique, straight-line segments are “drawn” between each successive pair of calibrationpoints. Separate slope and Eo values are calculated using the adjacent pairof data points. For example, in a five-point pH calibration, four slopes andfour E0’s are calculated to correspond to the four line segments that connectthe data. Conductivity or pH values for samples are calculated accordingto which segment their potential values fall into. Those above or below therange of calibration are calculated by extrapolation from the top or bottommost segments.

The displayed slope is an average slope of the separate segments. Theslope may be outside the range normally expected for an electrode. Forexample, if the slope of one segment is low, then the average will be lowerthan theoretical, even though the response may be Nernstian over most of the range.

Example of calibration curve using this method:

25020015010050

0-50

-100-150-200-250mV

pH3 pH4 pH5 pH6 pH7 pH8 pH9 pH10



Conductivity Measurement The term conductance refers to the ability of materials to carry an electriccurrent. Liquids, which carry an electric current, are referred to aselectrolytic conductors. Under the influence of an electric field, the flow ofcurrent through an electrolytic conductor is accomplished by themovement of positive and negative ions. The conductance of a liquid isdefined by the ratio of current to voltage between any two points withinthe liquid. As the two points move closer together or further apart the ratiowill change. For analytical purposes, a dimension is given to themeasurement; i.e., the physical parameters of the measurement.

By defining the physical parameters of the measurement, a standardmeasure is created. The standard measure is referred to as specificconductance or conductivity, which is defined by the reciprocal of theresistance in ohms, measured between the opposing faces of 1 cm cube ofliquid at a specific temperature.

The units used to define conductance are:1/ohm=1 mho=1 Siemen(S)=1,000 mS=1,000,000 µS.The conductivity value is obtained by multiplying the conductance valueby the cell constant. See Figure 2 for Conductivity Ranges of CommonAqueous Solutions.

FIGURE 2 - Ranges of Common Aqueous Solution

s ms0.1 1 10 100 1 10 100 1000

high pressure boiler water

deionizer water

demineralizer water

wastewater

drinking water

surface water

brackish water, sea water

industrial process-water

concentrated acids and dyes

Cell ConstantsIn theory, a conductivity-measuring cell is formed by two 1 cm squaresurfaces spaced 1 cm apart. The theoretical cell just described has a cellconstant of K = 1.0 cm-1. The cell constant, K, is defined as the ratio of thedistance between the electrodes, d, to the electrode area, A. However, theexistence of a fringe-field effects the electrode area by the amount AR,therefore K = d/(A + AR). See Figure 3. Because it is normallyimpossible to measure the fringe-field effect and the amount of AR tocalculate the cell constant, K, the actual K of a specific cell is determinedby a comparison measurement to a standard solution of known conductivity (e.g., 0.01 M KCl).

FIGURE 3 - Ranges of Common Aqueous Solutions


Measurement Theory6

Electrode distance dFringe Field

Homogeneous Field



Cells of different physical configuration are characterized by their cellconstant, K. Often for considerations having to do with sample volume orspace, a cell’s physical configuration is designed differently. Cells withconstants of 1.0 cm-1 or greater normally have small, widely spacedelectrodes. Cells with constants of 0.1 cm-1 or less normally have largeclosely spaced electrodes.

Since K is a “factor” which reflects a particular cell’s physicalconfiguration, the cell constant must be multiplied by the observedconductance to obtain the actual conductivity reading. For example, a conductance reading of 200 mS using a cell with K = 0.1 cm-1, theconductivity value is 200 mS x 0.1 cm-1= 20 mS/cm.

Solutions with low conductivity, ranging from 0.01 µS/cm up to 300 µS/cm, are best measured with cells having a cell constant of K = 0.1 cm-1. Orion 4-electrode cells with K = 0.475 cm-1 are best used forsolutions with conductivity of 10 µS/cm to 500 mS/cm. Cells with K =10.0 cm-1 are also best used for solutions with conductivity of 10 µS/cm to 500 mS/cm. See Figure 4 for typical conductivity ranges forcell constants.

FIGURE 4 - Conductivity Cell Schematic

µS/cm mS/cm0.1

K=0.1

K=0.475

K=0.6

K=1.0

K=10

10 100 10 100 10001


Measurement Theory8

Temperature Effects The conductivity of a solution with a specific electrolyte concentrationchanges with temperature. The relationship of the change in conductivity asa function of temperature is described by a solution’s temperaturecoefficient. Temperature coefficients vary with each solution. Someexamples are shown in Table 1. The Orion 550A uses 2.1%/˚C as a defaulttemperature coefficient, which is representative of many aqueous samples,to compensate for temperature changes. The meter has an adjustabletemperature coefficient of 0.0 to 10.0%/˚C. The meter also has twoselectable nonlinear temperature coefficients: “nLFn” which is helpful formeasurements of natural waters, and “nLFu” for ultrapure water.

By definition, temperature compensated conductivity of a solution is theconductivity which that solution exhibits at the reference temperature. Thetemperature is chosen to be either 25 ˚C or 20 ˚C. A measurement made atthe reference temperature needs no compensation. The closer the sample isto the reference temperature, the smaller the error will be if the metertemperature coefficient is incorrect. The Orion 550A automaticallycompensates for temperature changes based on the temperature coefficientand the reference temperature when a temperature measurement issimultaneously made.

Table 1Typical Temperature Coefficients Between 25 and 50 ˚C(Percent change of Conductivity per ˚C)

Solution %/˚CUltrapure Water 4.55Salt (NaCl) Solutions 2.125% NaOH 1.72Dilute Ammonia 1.8810% HCl 1.325% Sulfuric Acid 0.9698% Sulfuric Acid 2.84Sugar Syrup 5.64



The Orion 550A allows the operators to enter their own temperaturecoefficient, with a selectable range from 0.0 to 10.0 %/˚C or select non-linear functions nLFu and nLFn for ultra-pure water and natural waterrespectively. The user can enter their own temperature coefficient bypressing the SETUP key to enter the setup menu and hitting the YES keyuntil the TC 2.1 screen is displayed. This value can be changed byscrolling up or down with the arrow keys, and the new value can beselected with the YES key. (NOTE: The YES key must be pressed toaccept the change.) The default value for TC factor on the 550A meter is2.1%/˚C.

SalinitySalinity is a measure of the total dissolved salts in a solution and is used todescribe seawater, as well as natural and industrial waters. Salinity is arelative scale based on a KCl solution. A Salinity value of 35 is relative toseawater at 15 ˚C and a conductivity value equivalent to a KCl solutioncontaining 32.4356 g KCl in 1 Kg of solution. The units to describesalinity are ‰ or ppt (parts per thousand). Orion 550A calculates thesalinity based on the Practical Salinity Scale of 1978, as referenced inStandard Methods or Water and Wastewater.


Measurement Theory10

Total Dissolved Solids Total Dissolved Solids (TDS) refers to the dissolved inorganics in asolution. These dissolved inorganics will carry a current and will bereflected as a conductivity reading. Since a relationship can be shownbetween conductivity and TDS, a conductivity reading can be used as anestimation of the presence of inorganics.

The standard method of determining TDS (Total Dissolved Solids) is byevaporating the sample to dryness at 180 ˚C and weighing the residue.After evaporating the sample, one would have to calculate a specific“factor” for the solution by taking the TDS value obtained in weighing anddividing it by the conductivity of the sample. This factor would then bemultiplied by the subsequent conductivity readings to obtain the TDS valueof the sample as referenced in Standard Methods or Water and Wastewater.

The Orion 550A allows the operators to enter their own TDS factor for thecalculation of the TDS value in mg/L, with a selectable range from 0.10 to1.00 and a default value of 0.49. The user can enter their own TDS factorby pressing the SETUP key to enter the setup menu and pressing the YESkey until the TDS FCTR 0.49 screen is displayed. This value can bechanged by scrolling up or down with the arrow keys, and the new valuecan be selected with the YES key. (Note: the YES key must be pressed toaccept the change.) The default value for TDS factor on the 550A meter is0.49, which is a reasonable estimate of a TDS factor for natural waterapplications.



ResistivityResistivity is equal to the reciprocal of measured conductivity values.Resistivity measures the resistance to the flow of the current through anaqueous solution at a specific temperature. This current is carried by ionsand is measured between opposite electrode plates forming a centimetercube. The units for resistivity on the 550A meter are Megohm-cm.

Conductivity Standard ValuesTable 2 contains conductivity values for Orion Conductivity/TDSStandards at a range of temperatures. The conductivity value at thetemperature of the standard should be used when using the DirectCal(tm)calibration procedure. For higher accuracy, data in this table may beinterpolated between integral temperature readings. There may be smalldifferences between the values shown here and other values in theliterature. These small differences are due to using kilograms of waterrather than liters, as well as changes in assigned molecular weights,definitions of the Siemen, the use of slightly different temperature scales,and whether or not the inherent conductivity of water was subtracted out.For further information, see “Review of Electrolytic ConductanceStandards”, Wu, Koch, Hamer and Kay, J. Soln. Chem. 1987,16, 985-997.


Measurement Theory12

Table 2Table of Conductivity vs. Temperature For Orion Conductivity Standards.Values shown are in µS (microSiemens).

Temp. 12.9 mS/cm Standard 1413 µS/cm Standard 100 µS/cm Standard ˚C Cat. No. 011006 Cat. No. 011007 Cat. No. 011008

0 7131 776 54

1 7344 799 56

2 7560 822 58

3 7776 846 59

4 7995 870 61

5 8215 894 63

6 8436 918 64

7 8659 943 66

8 8884 968 68

9 9110 992 70

10 9337 1017 72

11 9566 1043 73

12 9796 1068 75

13 10027 1094 77

14 10260 1119 79

15 10494 1145 81

16 10729 1171 83

17 10956 1198 85

18 11203 1224 87

19 11441 1251 88

20 11681 1277 90

21 11922 1304 92

22 12164 1331 94

23 12407 1358 96

24 12651 1386 98

25 12896 1413 100



Temp. 12.9 mS/cm Standard 1413 µS/cm Standard 100 µS/cm Standard ˚C Cat. No. 011006 Cat. No. 011007 Cat. No. 01100826 13142 1441 102

27 13389 1468 104

28 13637 1496 106

29 13885 1524 108

30 14135 1552 110

31 14385 1580 112

32 14636 1608 114

33 14888 1636 117

34 15141 1665 119

35 15394 1693 121

36 15648 1722 123

37 15903 1751 125

38 16158 1780 127

39 16414 1808 129

40 16671 1837 131

41 16928 1866 134

42 17185 1896 136

43 17443 1925 138

44 17701 1954 140

45 17960 1983 142

46 18220 2013 145

47 18479 2042 147

48 18739 2071 149

49 18999 2101 151

50 19260 2103 154


14


General Information 15

Chapter III.General InformationInstrument DescriptionOrion 550A

DisplayA large bright LED display shows pH, or mV in the main (middle) fieldand Conductivity, Resistivity, TDS, or Salinity results in the lower field.Temperature is displayed in the upper field. The icon indicators at thesides and top of the display indicate the mode or function in which you areoperating. See Figure 5.

FIGURE 5 - Orion 550A Display

rdy cond

cal TC

pH

mV

mS/cm

rdy pH

man

ppt

mg/L

MΩ - cm µS/cm

C


General Information16

CalThis icon is the calibration mode indicator. This is an indication that themeter is being calibrated.

TCA function of conductivity, indicating that temperature compensation is set.The default temperature coefficient setting is 2.1%/˚C with a range from0.0 to 10%/˚C. Non-linear functions (nLFu for ultra-pure water and nLFnfor natural water) are available on the 550A as well.

˚CThis icon represents temperature in degrees Celsius. This indicator is litwhenever temperature is being displayed in the upper field of the meter.

pHThe pH icon indicates that the meter is displaying pH results in the main(middle) field.

mVThe mV icon indicates that the meter is displaying mV results in the main(middle) field.

mS/cmThis icon represents units of conductivity in milli-siemens per centimeter.This icon is lit when conductivity is being displayed in the lower field.

µS/cmThis icon represents units of conductivity in micro-siemens per centimeter.This icon is lit when conductivity is being displayed in the lower field.

rdy condThis icon is displayed when the conductivity reading has stabilized.



rdy pHThis icon is displayed when the pH reading has stabilized.

manThis icon is an indication that manual temperature has been set on themeter if a temperature probe is not in use.

pptThis icon represents salinity units in parts per thousand and when lit, itindicates that the lower field of the meter is displaying salinity results.

mg/LIndicates the units of TDS (Total Dissolved Solids) in milligrams per liter.This icon is lit when the TDS value is being displayed in the bottom field.

MΩ-cm The megohm centimeter icon represents units of resistivity and when lit,indicates that the meter is displaying resistivity results in the lower field.



KeypadThe Orion 550A meter has an 8-button keypad used to control all meterfunctions. Each keypress is acknowledged by the meter via a positive feelresponse. See Figure 6.

FIGURE 6 - Orion 550A Keypad

printautoyeslog viewlog

log clrcalmodesetup

pH/conductivity Orion 550A



Key Functionlog Dual function key: log logs data when in the

measurement mode, or allows scrolling throughoptions in the setup mode and numeric scrolling duringcalibration.

log clr Dual function key: log clr clears log data when in themeasurement mode, or allows scrolling throughoptions in the setup mode and numeric scrolling duringcalibration.

yes Dual function key: yes allows entry of parameterlog view settings. log view allows the user to view and scroll

through any logged data.

setup Press to enter setup mode. setup is entered to changeoperating parameters and to enter calibration options.

auto Press to obtain options for automatic logging of data, oroptions for automatic printing. When pressed inconjunction with the log key (auto then log), the meterwill automatically log data according to user-definedparameters. When pressed in conjunction with the printkey (auto then print), the meter will automatically printdata according to user-defined parameters.

mode Press to enter measurement mode from any screen.Used to change the measuring mode of the meter.Modes include pH, mV, conductivity, salinity, TDS andresistivity.

cal Press to select then initiate pH or conductivitycalibration.

print Press to print measured data or press in conjunction withthe auto key (auto then print) to choose type ofautomatic printing.



Meter Connections

FIGURE 7 - Orion 550A Meter Connections (Insert picture)

Item Feature Function1 8 pin DIN Connection Conductivity probe connection

2 Power Connection For connection of line adapter

3 RS232 Connection For Printer or computer

4 ATC port For separate temp. probe connection

5 BNC Connection pH electrode connection

6 Reference Input Connection of reference electrode

7 Recorder Output D/A Output for pH or Conductivity

RecorderATC

ReferenceBNC RS232Conductivity Line Adaptor

Input


System Setup 21

Chapter IV.System SetupInstrument Setup

Power SourceOrion 550A operates on an AC line adapter (Orion No. 020125 for 110V, Orion No. 020130 for 220V, or Orion No. 020135 for 240V).

**See Figure 7 For Orion 550A meter connections.

Power Up1. Connect the pH and conductivity probes to the meter.

2. Plug the meter in. All display indicators will be displayed briefly,followed by the Orion meter number.

Self-Diagnostics Checkout This test is performed every time that the meter is powered up (plugged in)WHILE THE YES KEY IS PRESSED.

1. Disconnect all sensors from the meter for the following test andconnect the BNC shorting cap. If the cell is attached and immersed insolution, the meter will fail “Test 3.”

2. Press and hold the YES key as the meter is powered up and the metermodel is displayed. The instrument automatically performs electronicand hardware diagnostic tests.

3. If any problems are found during self-test, the meter will display anoperator assistance code until the YES key is pressed. See page 57 forOperator Assistance Codes.

4. After Test 7 a “0” will appear on the display. Press each of the eightkeys from left to right starting from the top row.

NOTE: The time between each keypress must be less than 4seconds.

5. If any problems are found during self-test, the meter will display anoperator assistance code until the YES key is pressed. See page 57 forOperator Assistance Codes.


22

Setup MenuSystem operating parameters are configured by pressing the SETUP key toaccess the setup menu. The “setup” indicator on the display will beilluminated. There are two series of setup parameters (one for conductivityand one for pH). Choose the setup menu of interest by selecting either pHor COND with the SCROLL keys. When the desired option is selected,press the YES key.

• Scroll through Setup functions by pressing the YES key.

• Changes are made with the or keys.

• All changes must be acknowledged by pressing the YES key.

• Return to Measure mode by pressing the MODE key.

List of Setup Features

Display

SET pH/COND

pH SLP

pH rES

MAN (ATC)

Feature

Setup Menu choice

pH Slope

pH Resolution

Manual TemperatureInput (available onlywhen temperatureprobe is not in use)

Options

pH or COND, scroll to pHor COND with the or keys select choice with YESkey

Display of pH Slope forapproximately 3 secondsthen advances automaticallyto next function.

0.000, 0.00 or 0.0

-5 to 105 ˚C

Comments

Set to pH to select pHmode parameters. Setto COND to setConductivity modeparameters. pH is thedefault

This function is toview pH slope only. Itmay not be changedexcept via calibration.

Default is 0.000

For ManualTemperature Input(sample temperature)

pH Specific Setup Functions

System Setup

Comments

Default is 2.1% per ˚CWhich can be scrolledfrom 0.0 to 10.0%/˚Cwhen selected.

For ManualTemperature Input(sample temperature)

Default is 25 ˚C

Default is 0.49

Manual Cal. is thedefault calibrationselection

Default is OFF. Turnon when connectingplanar conductivitycell

Default is OFF.

Used to set specificparameter (pH, cond,or both) printing wheninput stabilizes.

24 hour clock

Default is 1200

Default is pH.Selection determinesman temperature pH or conductivity

Default is pH. Selectwhich parameter isused for recorderoutput.

Display

TC

MAN (ATC)

REF

TDS FCTR

CAL SEL

PLnr

rdY Prnt

SET Date

SET Hour

SET Baud

˚C dIS

Rec Out

Conductivity Specific Setup Functions

Feature

Temperature Coefficient

Manual TemperatureInput (available onlywhen temperaturesensor is not in use)

Reference Temperature

TDS Factor

Calibration Select

Probe Selection

Print on Ready

Sets meter Date

Sets meter clock

Baud Rate

Displayed TemperaturePriority

Recorder out selection

Options

Scroll to and press the YESkey to select either PEr(percent), nLFn (non-linearfunction for natural water),or nLFu (non-linearfunction for ultrapure water)

-5 to 105 ˚C

25 ˚C or 20 ˚C

0.10 to 1.00

Auto CalibrationManual CalibrationDirect CalibrationMultiple Point Calibration

Scroll with the or keysto turn planar conductivitycell from OFF to On

OFF, pH, Cond, both

YearMonthDay

HourMinute

1200, 2400, 4800 or 9600

Select either pH or COND

Select either pH or COND


System Setup 23

Common Setup Functions

NOTE: Manual Temperature Input is not accessible in the Setup mode when aconductivity cell with an internal temperature sensor or an external temperaturesensor is attached to the meter.


24


Operation Measurement 25

Chapter V.Operation MeasurementThe Orion 550A has six measurement modes: pH, mV, conductivity, totaldissolved solids (TDS), salinity and resistivity. Pressing the MODE keycan access these modes. When the mode key is pressed the user can scrollthrough three selections: SET pH, SET COND, or SET ˚C. Choosedesired selection by pressing the YES key. Once the mode is selected, usethe or keys to scroll through choices and select with the YES key.

Example: If the user wants to change units of conductivity to resistivity,then press MODE key, scroll to COND and select with the YES key. Thenscroll COND to rSt and select with the YES key.

pH: pH measurements are displayed in the middle(main) field and are reported in pH units.

mV: mV measurements are displayed in the middle(main) field and are reported in mV units.

Conductivity Mode: Conductivity measurements are displayed in thelower field and are reported in millisiemens percentimeter (mS/cm), or microsiemens per centimeter(µS/cm) depending upon the sample concentration.

Salinity Mode: Salinity measurements are displayed in the lowerfield and are reported in parts per thousand. Orion550A meter calculates salinity based upon thePractical Salinity Scale of 1978, as referenced inStandard Methods for Water and Wastewater.


Operation Measurement26

TDS Mode: Total Dissolved Solids are displayed in the lowerfield of the meter and are reported in units ofmilligrams per liter. The Orion 550A allows theoperators to enter their own TDS factor for thecalculation of the TDS value in mg/L, with aselectable range from 0.50 to 1.00 and a defaultvalue of 0.66. The user can enter their own TDSfactor by pressing the SETUP key and scrolling toCOND and pressing the YES key to enter theconductivity setup menu. The user can then pressthe YES key until the TDS FCTR 0.66 screen isdisplayed. This value can be changed by scrollingup or down with the or keys, and the newvalue can then be selected with the YES key. (Note:the YES key must be pressed to accept the change.)The default value for TDS factor on the 550A meteris 0.66, which is a reasonable estimate of a TDSfactor for natural water applications.

Resistivity Mode: Resistivity measurements are displayed in the lowerfield and are reported in megohms-centimeter (MΩ-cm). Resistivity is equal to 1/conductivity.The chart below describes the relationship betweenunits of conductivity and resistivity.



Conductivity (µS/cm) Resistivity (megohm-cm)

0.056 180.1 10 1.0 1.010.0 0.1

*100.0 0.01*1413 0.0007

*12900 (12.9 mS) 8 x 10-5 (0.08 kilohm-cm)

* Denotes Orion Conductivity Standard Values

The MODE key can also be used to display both the pH and conductivitytemperatures. If the user wants to display both the pH and conductivitytemperature, then press the MODE key, scroll to ˚C and select with theYES key. The pH temperature is then displayed in the main (middle) fieldand the conductivity temperature is displayed in the bottom field.

NOTE: The temperature display for manual temperature duringnormal measurement is defined as being either pH orconductivity temperature in the Setup menu. The default displayfor temperature is pH.

Automatic ShutoffThe Orion 550A has an automatic shutoff feature that turns the meter offafter 20 minutes of inactivity. After the 20-minute period, the message“Stdby” (standby) will appear. All background readings are still active andthe meter will go back into active mode with the press of any key. Themeter’s settings, data storage and calibrations will not be lost if the metergoes into standby mode.

NOTE: Interval and differential datalogging and printing areconsidered meter activity and if the meter is continually loggingor printing data then it will not enter standby mode.



pH Calibration

AutocalibrationAutocalibration is the feature of the Orion 550A Meter that automaticallyrecognizes as many as five Orion buffers: 1.68, 4.01, 7.00, 10.01, and12.46, within a range of ± 0.5 pH units. Results greater than ± 0.5 pHunits from the correct value will trigger the meter to determine thatautocalibration is not being used. At this point, a manual calibration canbe performed or the calibration can be ended and repeated with freshbuffers. During calibration, the user waits for a stable pH reading. Oncethe electrode is stable, the meter automatically recognizes and displays thetemperature-corrected value for that buffer. Pressing YES to the recognizedvalue enters the value into memory.

Manual pH CalibrationTo calibrate with buffers other than 1.68, 4.01, 7.00, 10.01 or 12.46, usethe manual calibration technique. The calibration sequence is the same asautocalibration except that buffer values are manually entered using the or keys until the desired value is obtained and selected by the YES key.

Multipoint pH CalibrationUp to five-(5) point calibration can be performed on the Orion 550AMeter. Both autocalibration and manual calibration may be used withinthe same calibration curve. For example, autocalibration may be used withthe 1.68, 7.00, and 10.01 buffers while manual calibration would be usedwith 3.78 and 9.18 buffers.

NOTE: To abort the calibration and return to measure mode,the MODE key may be used until a calibration buffer value isentered. After a buffer value has been entered, the MODE key isused to end a calibration.

pH Calibration Procedure1. Rinse the pH electrode, place into the first calibration buffer and press

the CAL key. The last calibration type (pH or COND) will bedisplayed.

2. Press the SCROLL keys until pH is displayed. Then press the YESkey to select pH calibration mode.

3. The current pH slope value will be displayed briefly in the bottomfield as well as the Eo mV displayed in the middle field.

4. Then SET P-1??? will be displayed. To start the first calibration point,place the pH electrode in the buffer and press the YES key.

5. The meter will begin monitoring for a stable electrode signal. Whenthe electrode signal has stabilized, the pH rdy icon will light up. If abuffer is automatically recognized, the temperature and pH value willbe displayed. The autocalibration buffer value can be selected withthe YES key. If a manual calibration point is desired, the pH valuecan be scrolled to the desired value and selected with the YES key.

6. Once the first buffer has been entered, SET P-2? will be displayed. Ifa one point calibration is desired, press the MODE key. If the userexits at a one point pH calibration Set SLP will be displayed with thenew pH slope. The user can scroll the slope value up or down withthe or keys and hit YES to accept the new slope. To continueadding calibration points, rinse the pH electrode and place into thenext buffer. Repeat steps 4 through 6 for each subsequent buffer.

7. After the last desired buffer has been entered, press the MODE key.Upon exiting to active measurement mode, the meter will display thenew slope and Eo millivolt reading. If the user performs a five-pointcalibration upon completion of the last point, the calibration willautomatically end and the meter will return to measure mode afterdisplaying the new slope and Eo millivolt.

NOTE: For multiple calibration points, the displayed slope andE0 are the average values of all the segments.





Conductivity Calibration

Determination of the Cell ConstantIt is recommended to calibrate the cell constant against known conductivitystandards as the conductivity cell constant may shift with time. Calibrationfrequency depends upon the type of cell in use as well as the particularapplication. The Orion 550A has four means of calibration. The metermay be calibrated by a Manual Calibration (cell constant adjustmentmethod) or the meter may also be calibrated by performing a DirectCal™,an AutoCal™ or a Multiple point (Multipoint) calibration. Calibration forTDS, Salinity and Resistivity must be performed in the conductivity modeusing conductivity standards.

NOTE: When performing a multiple point calibration, alwayscalibrate with lower conductivity standards first and move tohigher conductivity standards in order to reduce carry over.

A Manual Cal is performed by placing the electrode into the conductivitystandard and then scrolling in the cell constant until the desiredconductivity measurement is obtained.

A DirectCal is performed by placing the electrode into the desiredconductivity standard and then inputting the standard value at the actualtemperature of the standard. The cell constant is then calculated by themeter. The Orion 550A meter allows a maximum of two conductivitystandards to be used for DirectCal (see Multipoint calibration for using 3 to5 conductivity standards).

An AutoCal is performed by entering the nominal cell constant and thenmeasuring the Orion calibration standard(s). When the reading stabilizes,the nominal calibration standard value is displayed. Whether using atemperature sensor or manual temperature entry, the meter corrects fortemperature internally. For best results, calibrate at the chosen referencetemperature.

A Multipoint calibration is performed by placing the electrode into thedesired conductivity standard and then inputting the standard value at theactual temperature of the standard. Each subsequent standard used requiresinput of the standard value at the actual temperature of the standard. Orionsuggests that the user calibrate the meter by entering the probe into theconductivity standards starting from low concentration working up to thehigher concentrations in order to reduce carry over during calibration.



Manual Calibration - The Cell Constant Adjustment Method The default calibration mode is Manual calibration. If the calibrationselection in SETUP has not been changed, then pressing the CAL key (andselecting conductivity calibration) the meter will automatically perform amanual calibration. When the CAL key is pressed and a conductivitycalibration is chosen, the meter switches to conductivity mode.

NOTE: To return to active measurement modes from thecalibration mode, press the MODE key.

1. Press the SETUP key to enter the setup mode. Press the or keysuntil SET COND is displayed. Select conductivity setup path with theYES key. Then press the YES key until the CAL SEL (select) promptis given. Scroll through the calibration options with the and keys until CAL MAN is displayed. Press the YES key to select cellconstant adjustment (MAN) mode. Then press the MODE key toreturn to Measure mode.

2. To initiate the cell constant adjustment method, rinse the conductivitycell, place into the calibration standard and press the CAL key.

3. Press the SCROLL key until COND is displayed as calibration choice.Then press the YES key.

4. CAL Man is then displayed, the “CAL” indicator, the current (ormanual) temperature, the non-temperature corrected conductivityvalue and the last cell constant will appear on the display.

5. Immerse the conductivity cell in the standard. Slightly agitate the cellto remove any air bubbles.

6. Enter the cell constant printed on the cell cable or estimate the cellconstant of the cell in use. Scroll the cell constant value, using the and keys, until the correct non-temperature compensated value ofthe conductivity standard is displayed. The measured conductivityvalue is updated when the scroll keys are released. Press the YES keyto accept the value. The meter will automatically return to measuremode after briefly displaying the new cell constant.



AutoCal™

The AutoCalibration feature, when activated, allows the meter to recognizeOrion Conductivity Standards. Only the following Orion standards maybe used: 12.9mS/cm (Orion No. 011006), 1413µS/cm (Orion No.011007)and 100µS/cm (Orion No. 011008).

To perform an AutoCalibration, the user must first activate theAutoCalibration feature. Then, upon entering Calibration mode, thenominal cell constant or current value in memory must be entered. Themeter is then ready to recognize Orion Conductivity Standards. AutoCalcan perform calibrations utilizing up to two Orion Conductivity Standards.

NOTE: When a standard is recognized, the nominal standardvalue is displayed. However, the temperature-corrected value isused internally as the calibration value.

AutoCal Method1. Press the SETUP key to enter the setup mode. Press the or keys

until SET COND is displayed. Select conductivity setup path with theYES key. Then press the YES key until the CAL SEL (select) promptis given. Scroll through the calibration options with the and keysuntil CAL Auto is displayed. Press the YES key to select autocalibration mode. Then press the MODE key to return to Measure mode.

2. To initiate the AutoCal method, rinse the conductivity cell, Place theconductivity probe into the standard. Slightly agitate the probe toremove air bubbles. Only the following Orion standards may beused: 12.9mS (Orion No. 011006), 1413µS (Orion No. 011007) and100µS(Orion No. 011008).

3. Press the SCROLL key until COND is displayed as calibration choice.Then press the YES key. The conductivity calibration type will bedisplayed “CAL AUTO”.

4. When “SET CELL” is displayed, the current cell constant will bedisplayed. This value may be accepted with the YES key or the cellconstant may be changed to a nominal value (default is 0.475) usingthe or key (When the desired cell constant is displayed, press theYES key.



5. The meter will then display P1 to indicate the first calibration point.While the meter is attempting to recognize the standard, dashes (----)will flash on the display.

6. When the meter recognizes a standard, the rdy cond indicator will bedisplayed simultaneously with the nominal value of the recognizedstandard displayed. If the probe input stabilizes without recognizinga standard, the dashes will stop flashing and the cond rdyindicator will be displayed.

7. When the recognized standard value is displayed, press the YES key.

8. After the first point is accepted, the meter will then display P2 &dashes (----) to indicate the second calibration point. If the operatorwishes to add a second point, go to STEP 9. If a one-point calibrationis desired, press the MODE key to return to measurement mode.

9. If a two-point calibration is desired, rinse the probe & place it into thesecond calibration standard, and follow steps 5 through 7. The newcell constant is displayed for 2 seconds and then the meter will returnto measure mode.

NOTE: Calibrate the meter by placing the probe into theconductivity standards starting from low concentration workingup to the higher concentrations in order to reduce carry overduring calibration. To avoid carry over, always rinse the probebetween standards.



DirectCal™ Direct Calibration Method NOTE: To return to active measurement modes from thecalibration mode, press the MODE key.

1. Press the SETUP key to enter the setup mode. Press the or keysuntil SET COND is displayed. Select conductivity setup path with theYES key. Then press the YES key until the CAL SEL (select) promptis given. Scroll through the calibration options with the and keys until CAL DIr is displayed. Press the YES key to DirectCalmode. Then press the MODE key to return to Measure mode.

2. To initiate the DirectCal method, rinse the conductivity cell, Place theconductivity probe into the standard. Slightly agitate the probe toremove air bubbles. Initiate calibration by pressing the CAL key. Thelast calibration type will be displayed.

3. Press the SCROLL key until COND is displayed as calibration choice.Then press the YES key. The conductivity calibration type will bedisplayed “CAL Dir”.

4. The “CAL” indicator will be lit and the display will ask “SET P-1?”

5. Press YES to begin. The display will now indicate the currenttemperature in the top field and the standard value of 199.9µS/cm.Press the CAL key to select the correct standard value range (rangesfrom 199.9µS/cm to 1999µS/cm to 19.99mS/cm to 199.9 mS/cm).Press YES to select the desired standard value range. Scroll with or until the desired value (at the standard temperature) is displayed.Press YES to accept. The meter will then take it’s measurement with“----” flashing until rdy cond is achieved.

6. The meter will then display “SET P-2?”, press the YES key tocontinue the calibration then repeat steps 4 and 5 to complete theDirectCal. If a one-point cal is desired, press the MODE key. Themeter will return to measure mode. After the second point has beenentered, the new cell constant is displayed for 2 seconds and then themeter will automatically return to measure mode.

NOTE: Calibrate the meter by placing the probe into theconductivity standards starting from low concentration workingup to the higher concentrations in order to reduce carry overduring calibration. To avoid carry over, always rinse the probe between standards.

NOTE: If “E-22,” cell constant out of range, appears on thedisplay, press the YES key to clear the error. See theTroubleshooting section for corrective action.



Multipoint Calibration Method NOTE: To return to active measurement modes from thecalibration mode, press the MODE key.

1. Press the SETUP key to enter the setup mode. Press the or keysuntil SET COND is displayed. Select conductivity setup path with theYES key. Then press the YES key until the CAL SEL (select) promptis given. Scroll through the calibration options with the and keys until CAL MuL is displayed. Press the YES key to multi-pointcalibration mode. Then press the MODE key to return to Measure mode.

2. To initiate the multi-point calibration method, rinse the conductivitycell, Place the conductivity probe into the standard. Slightly agitate theprobe to remove air bubbles. Initiate calibration by pressing the CALkey. The last calibration type will be displayed.

3. Press the SCROLL key until COND is displayed as calibration choice.Then press the YES key. The last conductivity calibration type willbe displayed.

4. The “CAL” indicator will be lit and the display will ask “SET P-1?”

5. Press YES to begin. The display will now indicate the currenttemperature in the top field and the standard value of 199.9µS/cm.Press the CAL key to select the correct standard value range (rangesfrom 199.9µS/cm to 1999µS/cm to 19.99mS/cm to 199.9 mS/cm).Press YES to select the desired standard value range. Scroll each digitwith or until the desired value (at the standard temperature) isdisplayed. Press YES to accept. The meter will then take it’smeasurement with “----” flashing until rdy cond is achieved.

6. The meter will then display “SET P-2?”, press the YES key tocontinue calibration.



7. Repeat steps 5 and 6 until the multi-point calibration is completed. Ifa three or four-point cal is desired, press the MODE key to completecalibration and return to active measurement mode. After the fifth hasbeen entered, the meter will automatically return to measure mode. Inall cases, the new average cell constant will be displayed for 2 seconds.

NOTE: Calibrate the meter by placing the probe into theconductivity standards starting from low concentration workingup to the higher concentrations in order to reduce carry overduring calibration. To avoid carry over, always rinse the probebetween standards.

NOTE: If “E-22,” Cal standard error, appears on the display,press the YES key to clear the error. See the Troubleshootingsection for corrective action.

Auto Range SelectionThe 550A features automatic range selection for the conductivitymeasurement. The most accurate range is automatically chosen by themeter based on the sample’s conductivity value. A small amount of overlapis provided between all ranges to avoid “range flip” when measuring asample whose conductivity is near the end of a range.

Temperature Compensation and MeasurementThe Orion 550A automatically compensates for temperature changes basedon the temperature coefficient and the reference temperature when atemperature measurement is simultaneously made by the temperature probeor manually entered into the meter. The temperature coefficient, referencetemperature, and manual temperature input are accessed in the SETUPmode. Most Orion probes have built-in temperature sensors.



Temperature CoefficientsThe Orion 550A Conductivity mode has a default temperature coefficient of2.1%/˚C. The temperature coefficient can be adjusted from 0.0 to10.0%/˚C. The temperature coefficient may also be set to either of the non-linear functions. The ultra-pure non-linear function (nLFu) is most helpfulin measuring ultra-pure waters. The natural non-linear function (nLFn) ismost helpful in measuring natural waters.

NOTE: If the coefficient is set to zero, the conductivity readingwill not be temperature compensated and the TC icon on thedisplay will not be lit.

To adjust the temperature coefficient:

1. Press the SETUP key to enter the Setup mode. Scroll with the or keys until Set Cond is displayed. Select conductivity setup mode withthe YES key.

2. When “TC PEr” is displayed select with the YES key and then2.1%/˚C or the last temperature coefficient in memory will also bedisplayed.

3. Use the or key to change the value.

4. Press the YES key to accept the new value.

5. Return to Measure mode by pressing the MODE key.

Reference Temperature (rEF)When temperature compensation is activated, the conductivity value isreferenced back to 25 or 20 ˚C. The default is 25 ˚C.

To adjust the reference temperature:

1. Press the SETUP key to enter the Setup mode. Scroll with the or keys until Set Cond is displayed. Select conductivity setup mode withthe YES key.

2. Press the YES key until “rEF” is displayed. The current referencetemperature will be displayed.

3. Use the or key to toggle between 25 ˚C and 20 ˚C.

4. Acknowledge the change by pressing the YES key.




Automatic Temperature CompensationWhen a pH electrode or conductivity cell with an integral temperaturesensor or a temperature probe is connected, the meter automaticallyrecognizes the connection and the “MAN” Indicator will be turned off.The measured values are automatically temperature corrected based on theentered temperature coefficient and reference temperature.

Manual Temperature CompensationTemperature-corrected values, based on the manually entered temperature,temperature coefficient and reference temperature, will be displayed. It isrecommended that the temperature of the sample be accurately determinedfor use with this method. Errors of 1% to 3% per ˚C are typicallyencountered if the effects of temperature are ignored.

NOTE: A temperature sensor must not be connected to themeter for manual temperature compensation.

NOTE: If a temperature sensor is connected, the manualtemperature function cannot be accessed.

1. Press the SETUP key to enter the Setup mode. Scroll with the or keys until either Set pH or Set Cond is displayed. Select setupmode of choice with the YES key.

2. Press the YES key until “MAN” is displayed.

3. Using the and keys, adjust the displayed temperature to the sample temperature.

4. Press the YES key to accept the value.




No Temperature CompensationSetting the temperature compensation (coefficient) to 0.0 can be used forconductivity, TDS and resistivity measurements only. When 0.0 is entered,the displayed value is the actual conductivity of the sample at its currenttemperature.

NOTE: In pH & Salinity modes, all measurement values aretemperature compensated. If a temperature probe is not pluggedinto the meter, manual temperature compensation at the currentlyentered manual temperature setting (default of 25 ˚C) is used.

1. Press the SETUP key to enter the Setup mode. Scroll with the or keys until Set Cond is displayed. Select conductivity setup modewith the YES key.

2. When “TC PEr” is displayed select with the YES key and then2.1%/˚C or the last temperature coefficient in memory will also be displayed.

3. Use the key to change the value to 0.0%/˚C.

4. Acknowledge the change by pressing the YES key.


Measurement with an External Temperature ProbeTemperature compensation and measurement is most convenientlyaccomplished by using an Orion pH electrode or Conductivity cell with anintegral temperature sensor. A conductivity cell with a dual banana plugand a separate temperature probe may be used on the Orion 550A with anadapter, Orion No. 010023. Temperature probes, which may be used onthe Orion 550A, are Orion Nos. 927005, 927006 and 927007.



Data Logging The Orion 550A has a data log that can store up to 200 data points. Eachdata point will include the active measurement value, the temperature, thedate and time of logging. Readings may be stored to the data log eithermanually or automatically. If the meter is set up to automatically log data,it may be done either on a timed interval or based on a difference in thereading

Manual Storage of Data1. To log data from any measurement mode, simply press the LOG key.

The current reading will be written to the log and a log point (L001 toL200) will be displayed in the middle readout. After display of thelogged reading for approximately one second, the display will return toan active reading.

2. A maximum of 200 points can be stored. Attempting to log data after200 points will result in an “E-26” error message on the display. If thishappens, the log must be cleared to continue logging data.

NOTE: If the logged data is not transferred or printed beforeclearing the log, it will be lost.

Automatic Storage of Data

The Orion 550A allows two types of automatic data storage. Differentiallogging (DIF) and Interval logging (INT).

1. To automatically log data from the current measurement mode, simplypress the AUTO key followed by the LOG key. The meter will displayOFF AUTO LOG. Pressing the or keys to cause the meter todisplay either DIF AUTO LOG or INT AUTO LOG. Then press theYES key to select the desired logging option.

2. If the differential logging option is selected, the user must then scrollto the parameter that will be used for datalogging whether pH orconductivity, and select with the YES key. Once pH or conductivity ischosen, the user may then set the differential value for datalogging(NOTE: differential parameter is dependent upon what measurementmode the meter was in when log setup function was entered).



3. The differential logging feature allows the user to log data accordingto a user-defined change in the pH, mV, conductivity, TDS, salinity, orresistivity readings. The differential range depends upon themeasurement mode that the meter was in before entering the log setupfunction. The pH differential range is 0.001 to 10.00 pH units. Thedefault is 0.500 pH units. The mV differential range is 0.1 to 500 mV.The default is 0.1 mV. The Conductivity differential range is 0.01 µS/cm to 500 mS/cm. The default is 20 µS/cm. The Salinitydifferential range is 0.1 to 70.0 ppt. The default is 1.0 ppt. The TDSdifferential range is 1 mg/L to 19900 mg/L. The default is 10 mg/L.The Resistivity differential range is 0.001 to 20 MΩ-cm. The defaultis 1 MΩ-cm. When the desired setting is displayed, press the YES key.The meter will return to measure mode. Automatic logging will thenstart based upon the parameters that have been established.

4. The interval data-logging feature allows the user to log data accordingto a defined time interval from 10 seconds to 60 minutes. The defaultinterval is 1 minute.

5. If the INT option is chosen, the meter will display the current intervalin memory. Use the and keys to scroll in the desired interval.

6. When the desired setting is displayed, press the YES key. The meterwill return to measure mode. Automatic logging will then start basedupon the parameters that have been established.

A maximum of 200 points can be stored. Attempting to log data after 200points will result in an “E-26” error message on the display. If thishappens, the log must be cleared to continue logging data.

NOTE: If the logged data is not transferred or printed beforeclearing the log, it will be lost.



Readout of Stored Data 1. To view data, press the LOG VIEW key from the measurement mode.

The last datalogged point number will be displayed.

2. To view other points, use the or keys to scroll through thenumbered data log points.

3. To view a datalogged point press the YES key. The temperature, pH,and conductivity will be displayed. To view other points, use the or keys to again scroll through the numbered data log points.

4. To return to active measurement modes, press the MODE key or theLOG VIEW key.

Printing of Stored Data1. To print all the logged data, press the LOG VIEW key from the

measurement mode. The last datalogged point number will bedisplayed.

2. Press the PRINT key while in viewing the last datalogged point tostart data transmission. The entire log will be printed. Each data set isseparated by one blank line. The following information is printed:

Sample Printouts:

Example of pH and Conductivity MeasurementORION 550A

Thermo Electron Corporation

© COPYRIGHT 2003

10-28-1999 17:52:43

pH: 2.4

mV: 258.8

Temp: 25.0 C MAN

pH Cal #1

Segment #1

CONDUCTIVITY 9.94 mS/cm

Temp: 25.3 C MAN

Temp. Coef. = 2.1 %/C

Cell Constant = 1.000 /cm

Reference Temp. = 25.0 C

Cond Cal #3 MANUAL



Example of Conductivity Calibration10-29-1999 09:22:19

Serial Number: 123345

DIRECT CALIBRATION

100.0 uS/cm 25.3 C

Cell constant 1 = 1.000 /cm

Slope = 1.0 %



ORION 550A


© COPYRIGHT 2003

Cal #5

10-29-1999 09:54:42


MANUAL CALIBRATION


Slope = 100.0 %



ORION 550A


© COPYRIGHT 2003

Cal #6

10-29-1999 10:27:09


DIRECT CALIBRATION

100.0 uS/cm 25.3 C

10.15 mS/cm 25.3 C


Slope = 98.6 %


Reference Temp. = 25.0 CCal #7

10-29-1999 10:27:45




DIRECT CALIBRATION

100.0 uS/cm 25.3 C

10.15 mS/cm 25.3 C


Slope = 98.5 %

Temp. Coef = 2.1 %/C


Cal #8

10-29-1999 10:27:45


DIRECT CALIBRATION

100.0 uS/cm 32.0 C

1413 uS/cm 32.0 C


Slope = 99.0 %


Reference Temp = 20.0 C

Example of pH CalibrationCal #1

10-28-1999 08:49:05


pH 4.01 Auto

Temp 25.0 C Man

mV 167.8

Elect Response Time 7.6s

Slope1 93.9 %

E01 1.8 mV

pH 7.00 Auto

Temp 25.0 C Man

mV 1.8


Slope2 93.6 %

E02 1.8 mV

pH 10.01 Auto

Temp 25.0 C Man

mV -164.8


Slope3 93.6 %

E03 1.8 mV

AVG Slope 93.7 %

AVG E0 1.8 mV



Example of Data Log PrintoutLog #1

10-28-1999 08:49:05

pH: 2.186

mV: 268.2

Temp: 25.0 C MAN

pH Cal #1

Segment #3

CONDUCTIVITY 237.6 uS/cm

Temp: 25.0 C MAN




Log #2

10-28-1999 08:49:05

pH: 2.187

mV: 268.1

Temp: 25.0 C MAN

pH Cal #1

Segment #3

CONDUCTIVITY 500 uS/cm

Temp: 25.0 C MAN




Cond Cal #1 MANUAL

Log #3

10-28-1999 08:49:05

mV: 268.1

Temp: 25.0 C MAN

SALINITY 0.2 ppt

Temp: 25.0 C MAN




Cond Cal #1 MANUAL

Erasure of Stored Data1. To clear all data in the log, exit from log view by pressing the

MODE key.

2. Press and hold the LOG CLR key for 2 seconds. The prompt “CLRDATA???”will be displayed. A YES keystroke will clear the log of alldata. LOG CLRD will be displayed once all data is cleared.

CAUTION: This will permanently erase all data from the log.Transfer or print out needed data before clearing the log.



Print Function The Orion 550A allows printing of data points. Each data point willinclude the current measurement value, the temperature, the date and timeof printing, the cell constant, the temperature coefficient and referencetemperature for the sample will be printed. Readings may be printed eithermanually or automatically. If the meter is set up to automatically print, itmay be done either on a timed interval or based on a difference in the reading.

Manual PrintingTo print the current reading to a printer or computer while in anymeasurement mode, press the PRINT key. Current displayed measurementswill be printed.

Automatic Printing1. To automatically print data from the current measurement mode,

simply press the AUTO key followed by the PRINT key. The meterwill display OFF AUTO PRT. Pressing the or keys to cause themeter to display either DIF AUTO PRT or INT AUTO PRT. Thenpress the YES key to select the desired printing option.

2. If the differential printing option is selected, the user must then scrollto the parameter that will be used for automatic printing whether pH orconductivity, and select with the YES key. Once pH or conductivity ischosen, the user may then set the differential value for printing (NOTE:differential parameter is dependent upon what measurement mode themeter was in when log setup function was entered).

3. The differential printing feature allows the user to print data accordingto a user-defined change in the pH, mV, conductivity, TDS, salinity, orresistivity readings. The differential range depends upon themeasurement mode that the meter was in before entering the printsetup function. The pH differential range is 0.001 to 10.00 pH units.



The default is 0.500 pH units. The mV differential range is 0.1 to 500 mV. The default is 0.1 mV. The Conductivity differential range is0.01 µS/cm to 1000 mS/cm. The default is 20 µS/cm. The Salinitydifferential range is 0.1 to 70.0 ppt. The default is 1.0 ppt. The TDSdifferential range is 1 mg/L to 19900 mg/L. The default is 10 mg/L.The Resistivity differential range is 0.001 to 20 MΩ-cm. The defaultis 1 MΩ-cm. When the desired setting is displayed, press the YES key.The meter will return to measure mode. Automatic printing will thenstart based upon the parameters that have been established.

4. The interval data-printing feature allows the user to print dataaccording to a defined time interval from 10 seconds to 60 minutes.The default interval is 1 minute.

5. If the INT option is chosen, the meter will display the current intervalin memory. Use the and keys to scroll in the desired interval.

6. When the desired setting is displayed, press the YES key. The meterwill return to measure mode. Automatic printing will then start basedupon the parameters that have been established.

NOTE: Auto print is turned off when you press the followingkeys: CAL, SETUP, AUTO, LOG VIEW, or MODE


48


Use with Printers and Computers 49

Chapter VI.Use with Printers and ComputersOne way communication to printers or two-way communication tocomputers is available on the Orion 550A.

RS232 Interface

FIGURE 8

ConnectionsMeter Pin Printer Pin

RXD 2TXD 3 RXD 2DSR 4SIG GND 5 SIG GND 5DTR 6RTS 7CTS 8 RTS 7

NOTE: Jumper 4 + 6 together and to SIG GND.

594837261


Use with Printers and Computers50

Data Transmission SettingsBaud Rate 1200 (adjustable)Parity (PC only) NoneData Bits (PC only) 8Stop Bit (PC only) 1Start Bit 1

Cables and Cable ConnectionsFor Computer, use: Orion No. 0ACBL0 (DB9 Connector)

Figure 9

Use with Orion Printers Connect printer 55PR40 (110V), 55PR49 (220V) or PRT300 (110V),PRT301 (220V) to the RS232 connector on the side panel. See OrderingInformation for information on printers and accessories.

Meter RS-232Connector (Pins)

594837261

594837261

Cable RS-232Connector (Sockets)

Meter ComputerCable

162738495

162738495

ConnectorDB9S

(Sockets)

ConnectorDB9P(Pins)

DSR

CTSTXDRTSRXDDTR

DSRCTSTXDRTSRXDDTR

GND


Orion 550A Remote Control Computer Commands 51

Chapter VII.Orion 550A Remote Control Computer CommandsThe Orion 550A meter has the capability to be operated by a remote device(computer or terminal). After connecting the meter to the device, press thecarriage return (<CR>) to initiate remote control. The commands are asfollows:

USER COMMANDS

Commands Responses“ \n ” , “Orion 550A Logged On”

“QUIT”, “Orion 550A Logged Off”

“EXIT”, “Orion 550A Logged Off”

“HELP”, “<CR>(log on)” first line

All command names, except hardware, are printed.

GET group“GETDATE”, “mm/dd/yyyy”

“GETTIME”, “hh:mm.ss”

“GETMODE”, Response: one of the six modes

“pH mode”, “mV mode”

“conductivity mode”, “salinity mode”

“TDS mode”, “resistivity mode”

“GETLOGPOINT”,

Response: “Log point: xxx” the current log point number and

the measurement data.

“GETREADY”,

Wait until ready, then send out the current reading:

“pH,xx.xxx,xxx.x,C”

“xxxx.x,mV,xxx.x,C”

“conductivity,xxx.x,uS/cm or mS/cm,xxx.x,C

“salinity,xx.x,ppt,xxx.x,C”

“TDS,xxxxx,mg/L,xxx.x,C”

“resistivity,xxx.xxx,MOhm-cm,xxx.x,C”

“GETCALPOINT”,

If pH: print all cal points and all segment slopes

“mm/dd/yyyy hh:mm.ss”

“Serial number,xxxxxx”

“P1,xx.xxx,xx.xx or xx.x”

“xxxx.x,mV,xxx.x,C”

“Slope 1,xxx.x,%”

“Cal point,1”


Orion 550A Remote Control Computer Commands52

If conductivity:

print cal mode,all cal points and all segment cell constants

“mm/dd/yyyy hh:mm.ss”

“Serial number,xxxxxx”

“Direct calibration”

“P1,xx.xx or xxx.x,uS/cm or mS/cm”

“Temp,xxx.x,C”

“Cell constant 1,x.xxx or xx.xx,/cm”

“Temp comp,2.1,%/C”

“Ref Temp,25.0,C”

“Cal point,1”

pH“GETPHSLOPE”,

Response: “pH slope 1,xxx.x,%,E0,xxx.x,mV”

“GETPHRES”, get pH resolution

Response: “pH,0.000 or 0.00 or 0.0”

conductivity“GETTC”,

Response: “Temp Coef,xx.x,%/C or nLFu,nLFn”

“GETREF”,

Response: “Ref Temp,xx.0,C”

“GETTDSFACT”,

Response: “TDS factor,x.xx”

“GETCONST”,

Response: “Cell Constant 1,x.xxx or xx.xx,/cm”

SET group“SETDATExx/xx/xxxx”, “Date set to: mm/dd/yyyy”

“SETTIMExx:xx”, “Time set to: hh:mm.ss”

“SETMODExxx”,

set current mode (first digit 0=pH,1=conductivity)

and sub-mode (2nd & 3rd digits 00=pH 01=mV,

00=cond 01=sal 10=tds 11=resist)

Response: same as “GETMODE”

“SETLOGPOINT”,

Collect latest measurement results and log a point.

Response: “xxx” the current log point number

pH“SETPHRESx”, x=1,2,3 set pH resolution

Response: “pH,0.000 or 0.00 or 0.0”


Orion 550A Remote Control Computer Commands 53

conductivity“SETTCxxxx”

Set temperature coefficient from xxxx= 0.0 to 10.0

or “NLFU, “NLFN”.

Response: “Temp Coef,xx.x,%/C or nLFu,nLFn”

“SETREFxx”,

Set reference temperature xx = 20 or 25 C

Response: “Ref Temp,xx.0,C”

“SETTDSFACTx.xx”,

Set TDS factor x.xx = 0.50 to 1.00

Response: “TDS factor,x.xx”

“SETCONSTxxxxx”,

Set Cell Constant 1 xxxxx= .0700 to 14.99

Response: “Cell Constant 1,x.xxx or xx.xx,/cm”

**This command is equivalent to Manual Calibration.

Software also sets Cell Constant 2 = 0.0; slope = 100.0%

MEAS grouppH

“MEASPH”,

Perform single pH measurement.

Response: “pH,xx.xxx,Temp,xxx.x,C”

“MEASMV”,

Perform single mV measurement.

Response: “mV,xxxx.x,Temp,xxx.x,C”

conductivity“MEASCONDUCT”,

Perform single conductivity measurement.

Response: “Conductivity,xx.xx or xxx.x,uS/cm or mS/cm,xxx.x,C”

“MEASSAL”,

Perform single salinity measurement.

Response: “Salinity,xxx.x,ppt,xxx.x,C”

“MEASTDS”,

Perform single conductivity measurement.

Multiple by TDS factor.

Response: “TDS,xxxx,mg/L,xxx.x,C”

“MEASRESIST”,

Perform single resistivity measurement.

Response: “Resistivity,xxx.x or x.xxx,Mohm-cm,xxx.x,C”


54

CAL grouppH

“CALPH”,

This routine collects as many as five calibration points.

A typical point is collected like the following:

Screen: “Start pH Cal Point x? ‘Y’ or ‘ESC’(return):”.

Type ‘Y’ or ‘ESC’ and return.

Screen: if “ESC” first time,

“Cal Aborted”, function completed.

Screen: “Measuring”.

Start measuring point x until stable(ready).

Screen: “pH,xx.xxx,abr,temp,xx.x,C”, //if abr

“pH,xx.xxx,temp,xx.x,C”, / / i f not abr

“‘Y’ or Enter value (0.000 to 14.00) & return”

Type ‘Y’ or enter a desired pH value and return.

Screen: “Start pH Cal Point x+1? ‘Y’ or ‘ESC’(return):”.

Type ‘Y’ or ‘ESC’ and return.

Screen: if “ESC”

“x Point Cal completed”

For x point cal, there are x-1 segment slope to be printed.

Send: “Slope x,xxx.x,%”

conductivity“CALDIRECT”,

Screen: “Enter point 1 value or ‘ESC’(return)”

Type: xxx.x, conductivity value for point 1, or “ESC” & return

Screen: “Cal Aborted” if “ESC”

“type ‘U’ or ‘M’”

Type: ‘U’ for uS/cm, ‘M’ for mS/cm

Screen: “Measuring ....”.

Meter starts measuring point 1 until stable (ready).

Screen: “Enter point 2 value or ‘ESC’(return)”

Type: xxx.x,conductivity value for point 2, or “ESC” & return

If “ESC”

Screen: “1 Point Cal completed”


Calibration completed.

Screen: “type ‘U’ or ‘M’”



Meter starts measuring point 2 until stable (ready).

Screen: “x Point Cal completed”


“% Linearity, xxx.x”

Orion 550A Remote Control Computer Commands


Warranty 55

“CALMULTI”,

This routine collects as many as five calibration points.

A typical point is collected like the following:

Screen: “Enter point x value or ‘ESC’(return)”

Type: xxx.x, conductivity value for point x, or “ESC” & return

Screen: If “ESC” first time,

“Cal Aborted”, function completed.

Screen: “type ‘U’ or ‘M’”



Meter starts measuring point x until stable (ready).

Screen: “Enter point x+1 value or “ESC”(return)”

Type: xxx.x, conductivity value for point x+1, or “ESC” & return

If “ESC”:

Screen: “x Point Cal completed”

For x point cal, there are x segment cell constants to be printed:

Screen: “Cell constant x,x.xxx or xx.xx,/cm”

“CALAUTO”,

Screen: “Auto Cal”

“P1, Start to Measure? ‘Y’ or ‘ESC’(return):”

Type: “ESC” to abort. Function completed.

Or ‘Y’ to start :

Send: “Measuring”.

Start measuring point 1 until stable (ready).

If recognized a standard: (100,1413 uS/cm, 12.9 mS/cm)

Send: “Value,1413,uS/cm”

If not:

Send: “No Standard Found, ‘ESC’ to exit:”

Receive: if ‘ESC’

Send: “Cal Aborted” and finish cal

or any key to restart measurement until stable again.

Send: “P2, Start to Measure? ‘Y’ or ‘ESC’(return):”


Send: “1 Point Cal completed”

Send: “Cell constant 1,x.xxx or xx.xx,/cm”

Or ‘Y’ to start :

Send: “Measuring”.

Start measuring point 2 until stable (ready).

If recognized a standard: (100,1413 uS/cm, 12.9 mS/cm)

Send: “Value,12.9,mS/cm”

“2 Point Cal completed”


“% Linearity, xxx.x”

If not:

Send: “No Standard Found, ‘ESC’ to exit:”


Send: “1 Point Cal completed”

Send: “Cell constant 1,x.xxx or xx.xx,/cm”


56


Troubleshooting 57

DisplayedError MessageE-02

E-03 through E-06

E-07

E-20

E-22

E-23

E-26

E-29

E-40

E-51

E-52

CauseMemory failure

Hardware failure

Keypad failure

Reading out of range

Cal Standard Error

Bad Slope

Data logger full

Printer error

Memory checksumerror

Bad EE Prom Read

Bad EE Prom Write

Action• Call for service

• Disconnect the conductivity cell and repeat theself test

• Repeat the self-test insuring that all keys arepressed within 4 seconds during test 7. Ifproblem persists, call for service

• Adjust cell constant

• Verify cell constant is appropriate for sampleconductivity

• Occurs when pH electrode is out of solution

• Recalibrate system using fresh buffers.

• Perform maintenance on pH electrode.

• Verify that different standard or buffer is beingused.

• Calibrate with fresh standards.

• Clean conductivity cell

• Replatinize conductivity cell (if applicable)

• pH electrode slope not in the range of 80% to 120%.

• Recalibrate using fresh buffers

• Perform maintenance on pH probe

• Clear data from memory

NOTE: Print out any needed logged databefore clearing the log.

• Verify printer is attached

• Verify printer is on

• Check printer operation (on line)

• Call for service



Chapter VIII.TroubleshootingOperator Assistance Codes


58


Assistance 59

After troubleshooting all components of your measurement system, contactThe Technical EdgeSM for Orion products. Within the United States call1.800.225.1480, outside the United States call 978.232.6000 or fax978.232.6031. In Europe, the Middle East and Africa, contact your localauthorized dealer. For the most current contact information, visitwww.thermo.com.


60


Warranty 61

Chapter X.WarrantyFor the most current warranty information, visit www.thermo.com.

The Thermo Electron Corporation, Orion products warranty covers failuresdue to manufacturer’s workmanship or material defects from the date ofpurchase by the user. User should return the warranty card and retain proofof purchase. Warranty is void if product has been abused, misused, or repairsattempted by unauthorized persons.

Warranties herein are for product sold/installed by Thermo or its authorizeddealers.

Any product sold by a U.S. or Canadian distributor must be returned toThermo for any warranty work. Please contact our Technical Servicedepartment for further information. A Return Authorization Number must beobtained from The Technical EDGE

SMfor Orion Products before returning

any product for in-warranty repair or replacement.

In the event of failure within the warranty period, Thermo will at thecompany’s option, repair or replace product not conforming to this warranty.There may be additional charges, including freight, for warranty serviceperformed in some countries. For service, call Thermo or its authorizeddealer outside the United States and Canada. Thermo reserves the right toask for proof of purchase, such as the original invoice or packing slip.

Field Service is available on Orion BOD AutoEZ™, EZ Flash® GC Accessoryand TEA Analyzer®. Contact our Field Service department for details onquotations and service, other field service-related activities.

The following products are warranted to be free from defects in material andworkmanship in the period listed below from the date of purchase from theuser or from the date of shipment from Thermo, whichever is earlier,provided use is in accordance with the operating limitations andmaintenance procedures in the instruction manual and when not having beensubjected to accident, alteration, misuse, abuse or breakage of electrodes:

Thirty-six months from date of purchase by the user (or forty-twomonths from date of shipment from Thermo)

• Waterproof Meters (Orion 630, 635, 830A, 835A, 260A, 261S, 265A,266S, 130A, 131S, 135A and 136S), Conductivity Meters (Orion105Aplus, 115Aplus, 125Aplus, 145Aplus, 150Aplus and 162A),PerpHect® pH/ISE Meters (Orion 310, 320, 330, 350, 370) pH/ISE


Warranty62

Meters (Orion 210Aplus, 230Aplus, 250Aplus, 290Aplus, 410Aplus,420Aplus, 520Aplus, 525Aplus, 710Aplus, 720Aplus and 920Aplus),pHuture MMS™ Meters (Orion 535A and 555A), pH/Conductivity Meter(Orion 550A), Dissolved Oxygen Meters (Orion 805Aplus, 810Aplus,850Aplus and 862A).

Twenty-four months from date of purchase by the user (or thirty-sixmonths from date of shipment from Thermo)

• Orion ROSS Ultra® Electrodes, Orion AQUAfast® IV Colorimeters, OrionAQUAfast® IV Turbidimeter, Orion 925 Flash Titrator™, Series 100DuraProbe™ Conductivity Cells and Series 800 Dissolved Oxygen Probes.

Twelve months from date of purchase by the user (or eighteen monthsfrom date of shipment from Thermo)

• Laboratory pH Meters, (Orion 301, 611 and 940), SensorLink®, pHuture™

pH Meters (Orion 610 and 620), Sage® Pumps, Cahn® Balances, 930Ionalyzer®, 950 ROSS™ FAST QC™ Titrator, 960 Titrator PLUS®, KarlFischer Titrators, Autosamplers, Liquid Handling Devices, LiquidHandling Automation Workstations (Orion AS2000, AS2500 andAS4000), Pumps (Orion SP201, SP201-HR, SP201-S, Peristaltic andRinse), pHuture® Conversion Box, Wine Master®, 607 Switchbox, rflink™, AQUAfast® II Colorimeters, Vacuum Degasser and Flowmeter.

• Orion EZ Flash® GC Accessory, Orion TEA Analyzer® 610 and 510excluding consumable items carry twelve months warranty only.

• Orion Ion Selective Electrodes, ionplus® Electrodes, ROSS™ Electrodes,Sure-Flow® Electrodes, PerpHecT® Electrodes, AquaPro ProfessionalElectrodes, No Cal™ pH electrodes, Standard Line pH Electrodes, Tris pHElectrodes, KNIpHE® electrode, ORP Triode™ (Orion 9180BN), pHuture™

pH Probes (Orion 616500) and pHuture MMS™ Quatrode™ and Triode™

(Orion 616600 and 617900), Orion 97-08 DO Probe, Series 100Conventional Conductivity Cells, temperature probes and compensators(except those products noted).

• Orion 93 and 97 ionplus Series sensing modules are warranted to give sixmonths of operation if placed in service before the date indicated on thepackage, except 93-07 and 97-07 Nitrate modules are warranted to giveninety days of operation if placed in service before the date indicated onthe package.

Six months from date of purchase by the user (or twelve months from


Warranty 63

date of shipment from Thermo)

• Orion Flash Titration™ Probe (Orion 092518), pHuture™ Electrode (Orion615700), pHuture MMS™ Pentrode™ (Orion 617500), Quatrode™ (Orion617800) and Triode™ (Orion 615800), Low Maintenance Triode™ (Orion9107BN), ORP Low Maintenance Triode™ (Orion 9179BN), andPerpHecT® Low Maintenance Triode™ (Orion 9207BN), WaterproofTriode™ (Orion 9107WP, 9107WL, 9109WL and 9109WP), QuiKcheK®

Meters and Micro Electrodes.

Three months from date of purchase by the user (or six months fromdate of shipment from Thermo)

• Economy Line Electrodes, Orion 91-05, 91-06, 91-15, 91-16, 91-25, 91-26, 91-35, 91-36, 92-06. Warranty also includes failure for any reason(excluding breakage), except abuse, provided the electrode is not used insolutions containing silver, sulfide, perchlorate, or hydrofluoric acid; or insolutions more than one (1) Molar in strong acid or base at temperaturesabove 50 °C.

“Out-of-Box” Warranty - Should any of the following products fail towork when first used, contact Thermo immediately for replacement.

• Orion Solutions, Standards, Reagents, Cables, Ferrules, Tubing, Lineadapters, Printers, Software, Cases, Stands, Probe Membranes,AQUAfast® Test Strips, EZ Flash® columns, Liquid Handling Probes,Adapter Plates and Racks and general accessories.

For products in the catalog not listed in this warranty statement, please visitour website at: www.thermo.com.

THE WARRANTIES DESCRIBED ABOVE ARE EXCLUSIVE AND INLIEU OF ALL OTHER WARRANTIES WHETHER STATUTORY,EXPRESS OR IMPLIED INCLUDING, BUT NOT LIMITED TO, ANYIMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE AND ALL WARRANTIES ARISING FROMTHE COURSE OF DEALING OR USAGE OF TRADE. THE BUYER’SSOLE AND EXCLUSIVE REMEDY IS FOR REPAIR ORREPLACEMENT OF THE NON-CONFORMING PRODUCT OR PARTTHEREOF, OR REFUND OF THE PURCHASE PRICE, BUT IN NOEVENT SHALL THERMO (ITS CONTRACTORS AND SUPPLIERS OFANY TIER) BE LIABLE TO THE BUYER OR ANY PERSON FOR ANYSPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL


Warranty64

DAMAGES WHETHER THE CLAIMS ARE BASED IN CONTRACT, INTORT (INCLUDING NEGLIGENCE), OR OTHERWISE WITH RESPECTTO OR ARISING OUT OF THE PRODUCT FURNISHED HEREUNDER.

REPRESENTATION AND WARRANTIES MADE BY ANY PERSON,INCLUDING ITS AUTHORIZED DEALERS, REPRESENTATIVES ANDEMPLOYEES OF THERMO WHICH ALTER OR ARE IN ADDITION TOTHE TERMS OF THIS WARRANTY SHALL NOT BE BINDING UPONTHERMO UNLESS IN WRITING AND SIGNED BY ONE OF ITSOFFICERS.


Notice of Compliance 65

Chapter XI.Notice of ComplianceThis equipment generates, uses, and can radiate radio frequency energy andif not installed and used in accordance with the instruction manual, maycause interference to radio communications. It has been tested and found tocomply with the limits for a Class A computing device pursuant to SubpartJ of Part 15 of FCC Rules, which are designed to provide reasonableprotection against such interference when operated in a commercialenvironment. Operation of this equipment in a residential area is likely tocause interference in which case the user, at his own expense, will berequired to take whatever measures may be required to correct theinterference.

“This digital apparatus does not exceed the (Class A) limits for radio noiseemissions from digital apparatus set out in the Radio InterferenceRegulations of the Canadian Department of Communications.”

“Le prèsent appareil numèrique n’ èmet pas de bruits radioèlectriquesdèpassant les limites applicables aux appareils numèriques (de la class A)prescrites dans le Rëglement sur le brouillage radioèlectrique èdictè par leministëre des Communications du Canada.”


66 Notice of Compliance

Declaration of Conformity

Manufacturer:Thermo Electron Corporation166 Cummings CenterBeverly, MA 01915 U.S.A.

hereby declares that the product550A Benchtop Meter

conforms with the following standards and documentsSafety EC Directive 72/23/EEC Low Voltage Directive

IEC 1010 Safety For Laboratory EquipmentUL 1262 Laboratory EquipmentCSA C22.2 No. 151 Laboratory Equipment

EMC EC 89/336/EEC Electromagnetic Compatibility

Emissions: EN 55022 EmissionsFCC Part 15 Class A

Immunity: EN 50082-1 Generic ImmunityIEC 801-2 ESD SusceptibilityIEC 801-3 Radiated SusceptibilityIEC 801-4 Conducted Susceptibility

These Orion products have been manufactured in compliance with theprovisions of the relevant Thermo Electron manufacturing and testdocuments and processes. Further, these documents and processes arerecognized as complying with ISO 9000:2000 by QMI, listed as File #001911.

Place and date of issue: ______________________________

Beverly, MA. John Meserve

June, 2003 Quality Assurance Manager


Specifications 67

Chapter XII.SpecificationsMeter Performance SpecificationspH measurementpH range -2.000 to 19.99pH resolution 0.001/0.01/0.1pH Relative accuracy ±0.01 pH Slope 80% to 120%pH Auto-Buffer-Recognition 1.68, 4.01, 7.00, 10.01, 12.46pH Calibration Points One to Five

mV measurementmV range ± 1600 mVmV resolution 0.1 mVmV Relative accuracy ± 0.2 or 0.05% of reading, whichever

is greater

Conductivity measurementConductivity range 0 to 500 mS/cmConductivity resolution (µS/cm) 0.01Conductivity accuracy 0.5% ± 1 digitAuto ranging YesCell constant 0.07-14.99Cell types 2 or 4 electrode cells

Resistivity measurementResistivity range 0-20 MΩ-cmResistivity resolution 0.01 MΩ-cmResistivity accuracy 0.5% ± 1 digit

Salinity measurementSalinity range 0.0 to 80.0 pptSalinity resolution 0.1Salinity accuracy ± 0.1


Specifications68

TDS measurementRange 0 to 19,900 mg/LResolution 1 mg/LAccuracy ± 0.5%

Temperature measurementTemperature range -5 to 105 ˚CTemperature resolution 0.1Temperature accuracy ± 0.1Reference temperature 20 or 25 ˚CTemperature compensation Linear adj. (0.0-10.0%/˚C), nLFn, nLFu

InputsCond. cell connection 8 pin DINSeparate temperature probe 3.5 mmpH electrode connection BNCRef. electrode connection Pin tip connectorPower input AC Adapter

OutputsTwo way RS232 YesRecorder output Yes (selectable as either pH or

Conductivity

Data ManagementData log points 200Timed print YesAutomatic datalogging/printing YesLog interval 10 secs. - 1 hour, Or user defined

threshold

Power110/115/220/240 line adapter Yes

RegulatoryRegulatory UL/CSA/CE/FCC Yes

Class AGLP Features Yes


Ordering information 69

Chapter XIII.Ordering informationCatalog No. Description

0550A0 Orion 550A with 81-02 pH probe and 110V line adapter

0550A1 Orion 550A with 81-02 pH probe and 220V line adapter

0550A2 Orion 550A, meter only

0550A3 Orion 550A with 81-02 pH probe, 013005A conductivitycell and 110V line adapter

0550A4 Orion 550A with 81-02 pH probe, 013005A conductivitycell and 110V line adapter

0550A7 Orion 550A and 240V line adapter



013016A Two Electrode Conductivity Cell with Integral TemperatureSensor, Stainless Steel, K=0.1

018020A Two Electrode Conductivity Cell with Integral TemperatureSensor, Glass/Platinum K=10.0

013005A Four Electrode Conductivity Cell with Integral TemperatureSensor, Epoxy/graphite, K = 0.475, 1.5 meter Cable

013610 Four Electrode Conductivity Cell with Integral TemperatureSensor, Epoxy/graphite, K = 0.55, 3 meter cable

010500 Orion 105 and Orion 011510 Conductivity Cell

010502 Orion 105, meter only



011510 Conductivity Cell with Integral Temp.Sensor,Epoxy/graphite, K = 1.0

012500 Orion 125 and Orion 013005A Conductivity Cell




Ordering information70

Catalog No. Description014502 Orion 145, meter only

0145US USP Package including Orion 145 meter, AC adapter,conductivity cell, cell adapter, calibration kit andconductivity standard

015000A Orion 150 and Conductivity Cell


0150US USP Package including Orion 150 meter, AC adapter,conductivity cell, cell adapter, calibration kit andconductivity standard

010023 Adapter for cells with banana plugs and ATC

011010A Conductivity Cell, Glass, K = 1.0, 8 pin WP DIN

011020A Conductivity Cell, Glass, K = 0.1, 8 pin WP DIN

011050A Conductivity Cell, Epoxy, K = 1.0, 8 pin WP DIN

927005 ATC Probe, Epoxy Body

927006 ATC Probe, Glass Body

927007 ATC Probe, Stainless Steel

011006 Conductivity/TDS Standard, 12.9 mS/cm, 7230 ppm asNaCl, 5 x 60 mL Bottles

011007 Conductivity/TDS Standard, 1413 µS/cm, 692 ppm asNaCl, 5 x 60 mL Bottles

011008 Conductivity/TDS Standard, 100 µS/cm, 47 ppm as NaCl, 5 x 60 mL Bottles

011221 Calibration Kit, 4 precision conductance calibrators, 8 pin WP DIN

8102BN ROSS Combination pH electrode

8103BN ROSS Combination with glass body, semi micro

8104BN ROSS Combination with glass body and rugged bulb

8172BN ROSS sure-flow combination glass body


Ordering information 71

Catalog No. Description020125 Line Adapter, 110 V

020130 Line Adapter, 220 V

020135 Line Adapter, 240 V

0ACBL0 Cable, RS232, for use with IBM PC compatibles

PRT 300 Ink Based Printer, 110 V, Cable Included

PRT 301 Ink Based Printer, 220 V, Cable Included

PRT 302 Replacement Printer Ribbon

55PR40 Orion 550PR40 Printer, 115 V

55PR49 Orion 550PR49 Printer, 220 V

Orion offers a variety of probe accessories, materials & cable lengths.Refer to the Laboratory Products Catalog or call Customer Service.

230980-001 Rev. D

Analyze • Detect • Measure • Control™

Environmental InstrumentsWater Analysis

North America 166 Cummings CenterBeverly, MA 01915 USATel: 978-232-6000Dom. Fax: 978-232-6015Int’l. Fax: 978-232-6031

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Orion Benchtop pH/Conductivity Meter - Cole-Parmer-27… · pH mV mS/cm rdy pH man ppt mg/L MΩ- cm...

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