Microprocessor Operation Manual pH/ORP/ION Benchtop...

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SP-2300/SP-2500 Microprocessor pH/ORP/ION Benchtop Meter

Operation Manual

CONTENTS 1. Specifications ................................................................................................................1 2. Panel Description ...........................................................................................................2

2.1 Front panel ...........................................................................................................2 2.2 Sockets...................................................................................................................2 2.3 Display...................................................................................................................3 2.4 Keypad ..................................................................................................................4

3. Operation ........................................................................................................................5 3.1 Measurement ........................................................................................................5 3.2 Block diagram of parameter settings .................................................................6 3.3 Parameter settings ...............................................................................................7 3.4 Auto/Manual data storage .................................................................................16 3.5 Data transmitting and display ..........................................................................18 3.6 Delet all of data...................................................................................................23

4. Calibration....................................................................................................................24 4.1 pH calibration.....................................................................................................24 4.2 Opearation of pH calibration............................................................................26 4.3 Auto calibration for preset buffers (CT/CN) ...................................................26 4.4 Any Buffer manual calibration (CA) ...............................................................29 4.5 Define Buffers calibration (CD)........................................................................31 4.6 ORP relative potential adjustment...................................................................33 4.7 ION concentration calibration (SP-2500 only)................................................34 4.8 ION concentration calibration (CC) (SP-2500 only) ......................................35

5. Error message...............................................................................................................37 6. Maintenance .................................................................................................................38

6.1Battery replacement............................................................................................38 6.2 Electrode clean and maintenance .....................................................................38

7. Modbus protocol and instructions..............................................................................39 7.1 Function code .....................................................................................................39 7.2 Modbus name and address table ......................................................................40

8. Appenix .........................................................................................................................41 Note: The instrument software and hardware maybe modified to make progress of the better operation and better accuracy. Thus, this may result in difference between this manual and your instrument. We can not guarantee there are no errors in the manual. Therefore, we are sure that you understand that we cannot accept any legal claims resulting from the data, figures or descriptions.

1. Specifications

Model SP-2300 SP-2500 Measuring Unit pH/ORP/TEMP pH/ORP/TEMP/ION

pH -2.00~16.00 pH/-2.000~16.000 pH ORP -1999~1999 mV/-1999.9~1999.9 mV

TEMP -10.0~110.0 �C Measuring

RangeION �� 0.001~1999.9 ppm(mg/l) pH 0.01 pH/0.001 pH

ORP 1 mV/0.1 mV TEMP 0.1 �C

Resolution

ION �� 1, 0.1, 0.01, 0.001 ppm(mg/l)pH ±0.01 pH/±0.005 pH(±1Digit)

ORP ±0.05 %(±1Digit) TEMP ±0.2 �C(±1Digit)

Accuracy

ION �� ±0.5 %(±1Digit) Auto-Read(HOLD) Yes

Automatic with PT1000/NTC30K, auto recognition Temperature Compensation Manual

Calibration pH: Tech./ NIST/ ANY/ Define Buffer mode

ION: Ion concentration calibration (SP-2500 only) Up to 5-points calibration

Rel. ORP Relative potential adjustable range: ±300 mV GLP Calibration Timer/Counter Timer or Counter selectable, range: 0~9999 times or hours

One way transmission: To the computer/ printer (ASCII) RS232 Interface

Two way transmission: Modbus (RTU or ASCII)

Data Storage 500 data sets with time and date stamp Continuously auto data storage & logging /Manual

Auto Power-off Yes, On/Off(Programmable time duration for auto power-off)Ambient

Temperature 0~50�C

Storage Temperature

-20~70�C

Impedance Input 1012� Display LCD Display with backlight

Power Consumption Max. 1W Power Supply 4 x AA Batteries or AC/DC 6V adaptor Certification CE Dimension 220x190x70mm(LxWxH)

Weight 0.7Kg Note: The specifications and appearance of the instrument are subject to change without notice.

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2. Panel Description

2.1 Front Panel

2.2 Sockets

pH/ISE ：BNC socket for pH, ORP, or specific ION electrode REF. ：Reference electrode socket T/P ：Temperature probe socket POWER ：6V DC Adaptor socket RS-232 ：RS-232 interface for computer/printer connection (For optional accessory: RS-232 cable Order No. 8-32)

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2.3 Display

Setting Mode

Reading Mode

Unit Display

Auto Read

Time/Date

Baud Rate

Data Output/

Transmitting

Mode

Data Storage Location No.

Data Storage ID No.

Low Battery

Warning

Data Storage

Mode

Calibration

Mode

Auto Temp.

Compensation

Measuring

Mode

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2.4 Keypad

Power ON/OFF. Press POWER key to turn on the instrument, press it again to turn it off. Press POWER for a while when the power is already on, then the display will show the model type and software version. The user may set up auto turn-off timer. Users may select to switch on the auto power-off function (with programmable timer) ,or to switch off the function.

Switch to pH, ORP or ISE(SP-2500 only) mode. Press “Mode” key to back to measuring mode at any time except under calibration mode.

Enter calibration mode / Select buffer type

Activate/deactivate Auto Read control. Hold the measurement value, press it for activate the function, and press again to cancel it.

Increase values / Scroll upwards or leftwards.

Decrease values / Scroll downwards or rightwards.

Confirm inputs / Execute / Transmitting data manually via RS-232 in measuring mode.

Activate manual data recall and mode selection / Deactivate auto data recall.

Activate manual data storage / Deactivate auto data storage

Note: The icon of the manual is subject to change without notice.

POWER

MODE

AUTOREAD

UP

DOWN

ENTER

RECALL

STORE

CAL

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3. Operation 3.1 Measurement

Press POWER key to turn on the instrument and it will directly enter the last measurement mode to start measurement. Press POWER key for a while when the power is already on, then the display will show the model type and software version. The user may set up auto turn-off timer. Users may select to switch on the auto power-off function (with programmable timer) ,or to switch off the function. 3.1.1 Mode

Press MODE key to switch to pH, ORP, ION(for SP-2500 only) measuring mode. (ION mode has 2 units: ppm and mg/l for selection.) Press ENTER key +MODE key to switch on the decimal of resolution.

3.1.2 Temperature compensation 1. ATC Automatically recognition of temperature probe NTC30K or

PT-1K and auto temperature measurement and compensation. Under setting mode, the temperature can be adjusted ±5�C for temperature correction.

2. MTC Entering into manual temperature compensation mode when there is no ATC probe plugged in. Press upward or downward key to modify the temperature value. Press upward and downward key simultaneously to restore default value 25�C.

3.1.3 Auto Read Drift Control Under measurement mode, press AUTO READ key to hold the present reading(HOLD), and press ENTER key to confirm the Auto-Read function and to activate new measurement. Wait until the measurement is stable, the instrument hold the value automatically(HOLD) to finish the procedure. To cancel the hold value, press AUTO READ key or MODE key to relieve the Auto-Read hold value. Press AUTO READ key

Put the electrode into sample solution, press ENTER for starting reading. The Auto Read symbol twinkles. Wait until the measurement is stable. If the measurement cannot be stable in a certain time, the display shows E-03 error message, and the Auto Read symbol disappears. Press ENTER key again to re-start the Auto-Read

Wait until the measurement becomes stable, the Auto Read symbol stop twinkling. The display shows the pH measurement and holds the value.(HOLD)

Relieve Auto-Read Hold Press AUTO READ key or MODE key

Activate Auto-Read

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3.2 Block diagram of parameter settings

Note: Under any setup mode, press MODE to back to measurement mode at any time. (Except Buffer_1~5 Settings)

Buffer_1~5Setting

Upward and Downward key

Enter key

PressRECALL

Key

BufferDefine

Buffer table

Computer/Modbus

Comunica-tion

RTU o ASCII

Parity

Baud rate

Preset: Auto

GlpCalibration

cycle setting

Glp.TCounterSetting

Glp.HTimerSetting

Year setting

DateSetting

Time setting

Set measure-

ment averageTimes

OFF(Off)

AUTO(On)

TimerSetting

Preset:Auto

SystemTime setting

SEC(Digital Filter)

Auto_PowerAuto Power off setting

Enter Parameter Setting mode

AUTO(On)OFF

ATCTemp.

Compen-sation

Temp.Setting

Data Clear(Rewritable)

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3.3 Parameter settings 3.3.1 Entering setting of parameter

While the instrument’s power is off, press MODE key and hold the pressing continuously, and press POWER key until the display shows model of the instrument. Release the POWER key and wait until the menu display enter into parameter settings mode, and then release MODE key. Press upward or downward key to select setting menu. To exit the parameter settings mode, press MODE key to back to measurement mode. Factory default value: Data Storage Rewriteable Function: AUTO Communication Settings: ASCII, non, 4800 GLP Calibration Settings: Counter, 5 System Time Settings: 2011, 01:01, 00:04 Digital Filter: 5 Auto Power-Off: OFF Define Calibration Buffer Table: Please refer to Ch.8, Table 3

3.3.2 Data storage rewritable function Under data storage rewritable function menu display, users can set whether to enable the function. AUTO means to turn on the function. When data storage is full the data logger will overwrite the new data on the previous one. It is also allowed to select OFF to turn off the function.

Press ENTER key to enter.

Press upward or downward to select auto data storage rewritable function or to turn off the function.

Press ENTER key for confirmation

Enter “Communication” settings

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3.3.3 RS-232 communication settings

Users may according to their communication needs with following table to set transfer mode, (ASCII, RTU), parity (non, odd, even) and transmission baud rate (1200, 2400, 4800, 9600).

1. Communication setting format

RS232 Interface

Single way Data transfer to

computer or printer

Dual way Modbus Protocol

Mode ASCII ASCII RTU Transmission

Baud Rate 1200, 2400, 4800, 9600

2400, 4800, 9600

Default data bit 8 7 8 Parity non non, odd, even

non odd, even Default stop bit 2

2 1 The default

address None 1

Note:1.Because of different transmission formats, two kinds of communication mode can not be operated simultaneously.

2. This Modbus protocol does not include the selection of baud rate 1200. 3. Data bits, stop bits and the instrument’s address are preset value which can not be modified.

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2. Communication setting procedure

Press ENTER key to enter

Press ENTER key for confirmation

Enter “Calibration Cycle” settings

Press upward or downward key to select ASCII or RTU transmission mode.

Press upward or downward key to select odd, even or none parity, press ENTER key for confirmation.

Press upward or downward key to select baud rate, press ENTER key for confirmation.

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3.3.4 Calibration cycle settings(GLP calibration interval) Users can set their own calibration cycle counter or timer.

1. Calibration Counter: Under pH measurement mode, press AUTO READ key to activate the auto drift control measurement function. Each press of ENTER key represent that one time of measurement work has been done. After reaching the setup times for counter, the instrument makes reminder.

2. Calibration Timer: After how many hours from last calibration, the instrument makes reminder.

If it exceeds the set times or hours, under pH measurement mode the symbol in the display continuously twinkles. The twinkling symbol will disappear until the next execution of pH calibration

Enter “System Time” settings

Press upward or downward key to select calibration counter(t), or timer(H)

Press ENTER key to enter.

Press ENTER key for confirmation.


When the value twinkles, press upward or downward key to set calibration counter from 0~9999 times. If the value is set 0, it represents the GLP calibration counter has been turned off.


When the value twinkles, press upward or downward key to set calibration time from 0~9999 hours. If the value is set 0, it represents the GLP calibration timer has been turned off.

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3.3.5 System time settings Users may set the year, month, date, hour, and minute. When replacing the

batteries, it is necessary to enter to the setting to update the system time.

Enter “Digital Filter” settings


When the value twinkles, press upward or downward key to modify year. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to modify month. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to modify date. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to modify hour. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to modify minute. Press ENTER key to confirm it.

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3.3.6 Digital Filter settings (Sample average of measurements)

Enter “Auto Power-OFF” settings

Enter the setup of Digital filter. You may select the number of sample to be averaged each time to become a reading which is gradually counted in order to increase the stability of measurement.


When the value twinkles, press upward or downward key to modify times of digital filter. Press ENTER key for confirmation.

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3.3.7 Auto power-off settings

Enter the setup of auto power-off. Users may setup whether to activate the auto power-off function, and there is a programmable timer for setting. The auto power-off timer setting range is from 10 minutes minimum to 23 hours and 59 minutes maximum. Note: Preset---OFF

Enter “Auto Temperature Compensation Correction” settings


Press upward or downward key to select auto power-off, or to turn off this function. Press ENTER key for confirmation.

When the value twinkles, press upward or downward key to modify the auto power-off timer. Press ENTER key for confirmation.

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3.3.8 Auto temperature compensation correction settings

Enter auto temperature compensation settings. If the ATC probe is connected, it is allowed to correct the temperature value by pressing upward or downward key of 5 C. Or press upward and downward key simultaneously to zero the temperature modification value.

Note: If not ATC mode, it can not enter into auto temperature compensation correction settings.

Enter “Define Calibration Table” settings


When the value twinkles, press upward or downward key to modify the temperature value difference. The corrected temperature will show in next menu display. Press ENTER key for confirmation.

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3.3.9Defien cal. table setting (Self-definition pH/Temp. table--CD mode ) Define mode has pre-set 5 buffer solution pH/Temperature(Range: 5~50 C) table. Users may modify the data sheet according to the buffer solutions set which they use. The table can be modified and saved in the memory of the transmitter.

Press RECALL key to go back to “Datastorage rewritable function” settings, pressMODE key to back to measurement mode.


Press upward or downward key to select buffer set 1~5, Press ENTER key to enter.

When the buffer value twinkles, press upward or downward key to modify the buffer value. Press ENTER key to confirm it and to proceed to next temperature with the same buffer set.

While setting, users may press MODE at any time to back to buffer selection menu.

Each buffer value of each setting can be set from 5 C to 50 C. Every 5 C a setting. Press ENTER key to input it after sequence.

Press ENTER key to back to buffer set selection menu display. Users may select another buffer set and proceed the setting.

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3.4 Auto/Manual Data Storage Under data storage mode, users may store pH, ORP and ION(SP-2500 only)

measurement with No. and ID two kinds of classification. The “No.” represents the order of storage sequence. When data is stored to the 500th data, the display will shows “Full” to represent there is no more space for data logger memory. While ID number 1~500 is for grouping the samples which the user requires. The Auto data storage can be set according to the time interval setting, the minimum interval is 5 seconds. If turn on the Data Rewritable Function, when the data memory is full the data logger will overwrite the new data.

3.4.1 Auto data storage Under measurement mode, press and hold ENTER key and press STORE

key simultaneously to enter auto storage settings. When auto storage is not activated, press MODE key to exit the menu.

Auto Store twinkling represents the auto storage is activating. Press ENTER + STORE to turn off the auto storage function, and back to the measurement mode.

Display the starting storage number


Press upward or downward key to modify the grouping ID. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to set the minute interval of auto storage. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to set the second interval of auto storage. Press ENTER key to confirm it.

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3.4.2 Manual data storage 3.4.3 Overflow of data storage

Back to measurement mode


Display the starting storage number

Press upward or downward key to modify the grouping ID. Press ENTER key to confirm it.

Under measurement mode, press STORE key to enter manual data storage mode. Press MODE key to exit at any time.

When the all the memory is occupied and the data can not be stored any more, the display twinkles the text for reminder for 5 seconds and back to the measurement mode.

Users may delete all of the data according to the ch 3.6 instruction.(When auto rewritable function is turned on, there is no this data full display reminder.)

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3.5 Data transmitting and display Under measurement mode, press ENTER key to manually transmit the real-time

measurement value by RS-232 interface. Note: The output of the instrument is non-insulated signal. It may impact the

transmitting measurement value if the instrument connects with other earth-related device.

3.5.1 Time interval auto transmitting 3.5.2 Data display & manual transmitting

1.Display the stored data


(Transmit the real-time measurement to a computer or a printer through RS-232) Under measurement mode, press and hold ENTER key and then press RECALL key to enter auto transmitting menu display. After finishing setting, the data is transmitted through RS-232 interface.

When “Auto RCL” twinkles, it represents the auto transmitting function has been activated. Press ENTER+ RECALL to turn off the auto transmitting mode and back to the measurement mode.

When the value twinkles, press upward or downward key to set the minute interval of auto transmitting. Press ENTER key to confirm it.

When the value twinkles, press upward or downward key to set the second interval of auto transmitting. Press ENTER key to confirm it.

Under measurement mode, press RECALL key to roll up the data display & manual transmitting menu. There are four kinds of operation mode. Press ENTER key to enter the menu.

Press ENTER key to enter recent stored data menu display.

Press upward or downward key to select storage position. Press ENTER key to confirm it.

Display the data and its ID grouping. Press upward and downward key to directly look up other data and their ID grouping. Press ENTER key to confirm to display this data of measurement value, storage year, date, and time.

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2. Display the last calibration data(1)

Under pH measurement mode, press RECALL key to show the last pH calibration data in display. (ex: 3-Point calibration)

Press ENTER key to enter. The display shows Buffer 1 calibration data.

Press ENTER key to display the mV value of Buffer 1.

Press ENTER key to enter. The display shows Buffer 2 calibration data. If no data, ignores the procedure and display the Slope value.




Press ENTER key to display the SENSITIVITY value.

Press ENTER key to display the Slope value.

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(2)



Press ENTER key to display the ASYMMETRY value.

Press ENTER key

Press ENTER key to display the R2 value.

Press ENTER key to display the cal. data storage year.

Press ENTER key to display the cal. data storage date.

Press ENTER key to display the cal. data storage time.

Press ENTER key

Press ENTER key to display relative potential .

Under ORP measurement mode, press RECALL key to show the last relative potential adjusted data in display.

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(2)

Under ION measurement mode, press RECALL key to show the last ISE concentration calibration data in display. (ex: 3-Point calibration)(SP-2500 only)







Press ENTER key to display the SENSITIVITY value.

Press ENTER key to display the Slope value.

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3. Manual stored data transmitting (1) Transmit all the stored data

(2) Format of received storage data


Transmission completed Back to measurement mode

Note: The output of the instrument is non-insulated signal. It may impact the transmitting measurement value if the instrument connects with other earth-related device.

Press ENTER key to display the R2 value.

Press ENTER key to display the cal. data storage year.

Press ENTER key to display the cal. data storage date.

Press ENTER key to display the cal. data storage time.

Press ENTER key

Press ENTER key

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4. Calibration data transmitting 3.6 Delete all of the data (1) Transmit the stored cal. data Through RS-232 interface

(2) Format of received calibration data

SP-2300 pH mode

SP-2500 pH mode

SP-2500 ION mode

Transmission completed Back to measurement mode

Press ENTER key

Under power off status, press & hold STORE key and then press & hold POWER key until the display shows the model of instrument. Release POWER key. While the menu display shows data clean text, release STORE key.


Press ENTER key to confirm to delete all the data. To abandon the deletion, please press MODE key.

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4. Calibration Under measurement mode, press CAL key to enter calibration mode, and press

MODE key to go back to measurement mode.

4.1 pH Calibration

The instrument provides multi-point standard buffer solution calibration. You may decide how many points to calibrate the measurement system.(up to 5-point) The principle is according to “Method of Least Squares”. Apply linear regression to calibration the electrode’s slope and zero point (Asy, Offset or Zero point). When calibrating a electrode, you may calibrate 1 to 5 point by any sequence to provide linear regression for mV and pH multi-calibration of a electrode, and to show the electrode’s slope and zero point(Asy, offset or Zero point) at 25�C. The electrode’s slope rate which is actual slope divided by theoretical slope and the sensitivity shows in percentage in the display. In addition, the display shows the linear regression determination coefficient, R2, of the electrode and buffer solution to provide you an estimation of an electrode’s regression suitability. According to different combination of standard buffers, the TECH, NIST, Any buffer solution calibration modes are provided. 4.1.1 TECH mode (up to 3 points calibration), CT

The electrode is automatically calibrated according to built-in pH4.01, pH7.00, pH10.00 Tech standard buffers. The range of zero point and slope of the electrode is also determined. If one of them is over the range, the display shows error message of zero point and slope failure. (See appendix Table 1, pH/temperature table of TECH standard buffers)

4.1.2 NIST mode (up to 5 points calibration), CN

The electrode is automatically calibrated according to pH value and temperature of NIST standard buffers.(Built-in 1.68, 4.01, 6.86, 9.18, 12.45 NIST standard buffer calibration set) The range of zero point and slope of the electrode is also determined. If one of them is over the range, the display shows error message of zero point and slope failure. (See appendix Table 2, pH/temperature table of NIST standard buffers)

4.1.3 Any buffer mode (up to 5 points calibration), CA

The electrode measures mV value of different standard solutions. According

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to theoretic slope and the temperature of standard solutions, the display shows a approximate pH value. Then, you can calibrate the electrode by freely adjust the pH value as those of the standard solutions’. There is not a zero point range failure determination by the instrument but only the slope range determination. If the slope is over the range, the display shows error message of slope failure.

4.1.4 Define Buffers mode(up to 5 points calibration), CD

There is a factory default 5 buffer standard solutions pH/temperature table which may be modified and saved by users. When users have their own buffer solutions, they may create or modify the data sheet and then save it in the memory of transmitter. Under this calibration mode, the sensor does not do the zero-point calibration and slope range determination. (See appendix Table 3, pH/temperature table of define(built-in) standard buffers.)

4.1.5 Definition of calibration parameter

You can calibrate the electrode by one point or up to three points of standard solutions by any sequence. As different calibration point method is applied, the definition of the zero point and slope different.

Calibration point Determination The showed calibration value

One point calibration

Asy Zero point (Asy, offset or Zero point)= Asy 1.If not calibrated, Slope = Theoretical slope 2.If calibrated, Slope = Slope of last calibration

Two or three point calibration

Asy Slope

Zero point (Asy, offset or Zero point)= Asy Slope = Slope* Note: To obtain a new zero point(Asy) and Slope by applying linear regression.

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4.2 operation of pH calibration

4.2.1 Under pH measurement mode, press CAL key to enter pH calibration mode. Press MODE at any time to finish calibration and back to measurement mode.

4.2.2 After entering calibration mode, press CAL key

to switch buffer type. Press ENTER for confirmation. Buffer Type CT1: TECH. Buffer No.1

CN1: NIST. Buffer No.1 CA1: Any Buffer No.1 CD1: Define Buffer No.1

4.2.3 Within the 4 kinds of buffer type, they all can be done with up to 5 points calibration except TECH. Buffer for only single to three points calibration. You may calibrate the electrode with certain type buffers at any order.

4.3 Auto calibration for preset Buffers (CT / CN)

4.3.1 After entering to calibration mode, press CALkey to select Ct1 or Cn1. If temperature mode is set as MTC(Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to start to read the preset Buffer 1 value.

4.3.2 When reading the value, the “Auto Read” symbol in the display starts to twinkle. Wait until the value is stable or directly pressENTER key to read the present value, then the menu enter into preset buffer 1 value with temperature value.

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4.3.3 After entering preset Buffer 1 menu display, press ENTER or wait for 3 seconds to enter the Buffer 2 calibration menu display.

4.3.4 After entering into Buffer 2 menu display, press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi points calibration, clean the pH electrode with distilled water, put the electrode into second buffer solution. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to start to read the preset Buffer 2 value.

4.3.5 When reading the value, the “Auto Read”

symbol in the display starts to twinkle. Wait until the value is stable or directly pressENTER key to read the present value, then the menu enter into preset buffer 2 value with temperature value.

4.3.6 After entering preset Buffer 2 menu display, press ENTER or wait for 3 seconds to enter theBuffer 3 calibration menu display.

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4.3.7 After entering into Buffer 2 menu display, press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi points calibration, clean the pH electrode with distilled water, put the electrode into third buffer solution. Press ENTER key to start to read the preset Buffer 3 value for continuing calibration.

4.3.8 After finishing whether single, dual to five

points calibration(CT mode up to three points), press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode.

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4.4 Any Buffer manual calibration (CA) 4.4.1 After entering calibration mode, clean the pH

electrode with distilled water, put the electrode into first buffer solution. Press CAL key to select CA1. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to start to read the preset Buffer 1 value.

4.4.2 When reading the value, the “Auto Read”

symbol in the display starts to twinkle. Wait until the value is stable or directly pressENTER key to read the present value, then the menu enter into manual calibration for Buffer 1.

4.4.3 After entering into manual calibration of Buffer

1 menu display (pH value twinkles), press upward or downward key to adjust the value to the selected buffer 1 value. After confirming, press ENTER key to enter into CA2 calibration menu display

4.4.4 Under CA2 calibration menu display, if press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi points calibration, clean the pH electrode with distilled water, put the electrode into second buffer solution. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to start to read the Buffer 2 value.

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4.4.5 When reading the value, the “Auto Read” symbol in the display starts to twinkle. Wait until the value is stable or directly pressENTER key to read the present value, then the menu enter into manual calibration for Buffer 2.

4.4.6 After entering into manual calibration of Buffer 2 menu display (pH value twinkles), press upward or downward key to adjust the value to the selected buffer 1 value. After confirming, press ENTER key to enter into CA3 calibration menu display.

4.4.7 Under CA3 calibration menu display, if press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi points calibration, clean the pH electrode with distilled water, put the electrode into third buffer solution and continue the calibration procedures.

4.4.8 After finishing whether single, dual to five points calibration(CT mode up to three points), press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode.

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4.5 Define Buffers calibration (CD)

4.5.1 After entering calibration mode, clean the pH electrode with distilled water, put the electrode into first buffer solution. Press CAL key to select CD1.. Press ENTER key to start to read the user-tailored method Buffer 1 value.

4.5.2 After entering into define calibration menu display, the buffer text in the display starts to twinkle. Press upward or downward key to select the user-tailored Buffer 1 value. Press ENTER key to enter into temperature value setting menu display.

4.5.3 Under temperature setting menu display(the temperature twinkles), press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key(if as ATC mode) to start to read the present value.

4.5.4 When reading the value, the “Auto Read” symbol in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read the present value.

4.5.5 After entering into define calibration of Buffer 1 menu display, press ENTER key or wait for 3 seconds to enter into CD2 calibration menu display.

4.5.6 Under CD2 calibration menu display, if press MODE key to leave the calibration menu to finish it as a single point calibration. The menu display shows slope value; for multi-point calibration, clean the pH electrode with distilled water, put the electrode into second buffer solution and press ENTER key to enter user-tailored calibration value menu display.

4.5.7 After entering into define calibration menu display, the buffer text in the display starts to

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twinkle. Press upward or downward key to select the user-tailored Buffer 2 value. Press ENTER key to enter into temperature value setting menu display.

4.5.8 Under temperature setting menu display(the temperature twinkles), press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25�C. Press ENTER key(if as ATC mode) to start to read the present value.

4.5.9 When reading the value, the “Auto Read” symbol in the display starts to twinkle. Press ENTER key to read the present value.

4.5.10 After entering into define calibration of Buffer 2 menu display, press ENTER key or wait for 3 seconds to enter into CD3 calibration menu display.

4.5.11 Under CD3 calibration menu display, if press MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi-point calibration, clean the pH electrode with distilled water, put the electrode into third buffer solution and continue the calibration procedures.

4.5.12 After finishing whether single, dual to five points calibration, press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode.

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4.6 ORP relative potential adjustment Under pH measurement mode, press MODE key to

switch to the mV measurement mode. Press CAL key to enter relative potential adjustment mode. Press MODE key at any time to back to measurement mode.

4.6.1 Clean the ORP electrode with distilled water, put the electrode into ORP standard solution, and press CAL key enter into ORP relative potential adjustment.

4.6.2 Press ENTER key to read the value. The adjustable value in the menu display starts to twinkle. Press upward or downward key to adjust the value to the required value. Or press upward and downward key simultaneously to zero the value. Press ENTER for confirmation.

4.6.3 After displaying the adjusted value, wait for 3 seconds or directly press ENTER key to go back to measurement mode.

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4.7 ION concentration calibration (SP-2500 only) The instrument applies the easiest and widely used ion-selective electrode

direct potentiometry—ISE, to measure the potential reaction of the solution. Establishing the relationship of ion concentration(activity) and electrode potential by calibration, the instrument then is able to start measurement. The measurement and calibration of electrode is necessary to refer to the operation manual of ION selective electrodes(ISE).

The method of calibration standard solution usually applies continuous dilution from high concentration standard solution in sequence to get 1000, 100, 10, 1 ppm(mg/l). In order to prevent from the difference of ISE activity and actual concentration, it is usually necessary to add ISAB (Ionic Strength Adjustment Buffer) when calibration for making the sample solution has similar ionic strength.

It is recommended to use the calibration standard solution from low to high to prevent contamination of standard solution. If the concentration range of sample solution is known, it should be applied the nearest value of standard solution for calibration. If the sample measurement range and the standard solution calibration range have been confirmed to be in the linear range of the electrode, it is acceptable to make dual points calibration. However, making three of more points calibration can help to confirm whether the measurement is within the linear range or not.

The calibration is up to 5 points calibration, and the instrument provides “log(A) = the logarithm of the activity of the measured ion” of linear regression calculation for the electrode potential(mV) and ion concentration(activity). It measures and displays the electrode’s slope under 25 C and the ratio of electrode actual slope with theoretical slope. It also displays the percentage of electrode sensitivity for judgment whether electrode is aged or contaminated. It also displays the linear regression R2 value (determination coefficient) of electrode and standard solution as the judgment of electrode regression suitability.

Because the calibration slope is related the temperature, the measurement is compensated with temperature value. However, it is better to measure the standard solution and sample solution within ±2˚Ctemperature difference.

The definition of electrode slope determination:

Slope The number of valence 48 ~ 70 +1 monovalent ion

-48 ~ -70 -1 monovalent ion 24 ~ 35 +2 ion

-24 ~ -35 -2 ion Note: If over range, the error message of slope failure is E-02.

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4.8 ION concentration calibration (CC) (SP-2500 only)For concentration calibration(CC) (up to 5 points calibration), select ppm or

mg/l unit under measurement mode. Press CAL key to enter into ION concentration calibration mode. The instrument has built-in 10 sets selection of different standard solution value from: 1.00�2.00�5.00�10.00�20.0�50.0�100.0�200�500�1000. The minimum is 2 points calibration and up to 5 points calibration. Users may press MODE key at any time to finish the calibration and back to measurement mode.

4.8.1 Press CAL key to select CC1. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to start to read the preset standard solution No.1 value.

4.8.2 After entering into CC1 calibration menu display, the buffer text in the display starts to twinkle. Press upward or downward key to the required value. Press ENTER key to start to measure standard solution No. 1.

4.8.3 When reading the value, the “Auto Read” symbol

in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read and to display the standard solution No.1’s mV value.

4.8.4 Under the standard solution 1 menu display, wait

for 3 seconds or press ENTER key to enter into CC2 calibration menu display.

4.8.5 Clean the electrode with distilled water, put the

electrode into second standard solution Under CC2 calibration menu display. If temperature mode is set as MTC (Manual), the temperature value starts twinkling. Press upward or downward key to adjust the temperature value. Or press upward and downward key simultaneously to back to the preset value--25 C. Press ENTER key to enter into standard solution No.2 menu display.

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4.8.6 Under standard solution No.2 menu display. The concentration value starts twinkles, press CAL key to select concentration value, press upward or downward key to adjust it to the required value. Press ENTER key to read and to display the standard solution No.2’s mV value.

4.8.7 When reading the value, the “Auto Read” symbol

in the display starts to twinkle. Wait until the value is stable or directly press ENTER key to read and to display the standard solution No.2’s mV value.

4.8.8 Under the standard solution 2 menu display, wait

for 3 seconds or press ENTER key to enter into CC3 calibration menu display.

4.8.9 Under CC3 calibration menu display, if press

MODE key to leave the calibration menu to finish it as a dual point calibration. The menu display shows slope value; for multi-point calibration, clean the pH electrode with distilled water, put the electrode into third standard solution and continue the calibration procedures.

4.8.10 After finishing whether dual or up to five points calibration, press ENTER or wait for 3 seconds to show the slope value, the SENSITIVITY value, the ASYMMETRY value, the R2 value. Then after 3 seconds or press ENTER key to go back to measurement mode.

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5. Error messages

Messages Reason Dispositions

OFFSET(zero-pointelectric potential) value over range

1. Replace the buffer solutions 2. Maintain the electrode or

replace the new electrode, and make another calibration.

SLOPE value exceeds the upper or lower limit

1. Replace the buffer solutions 2. Maintain the electrode or

replace the new electrode, and make another calibration.

The readout is unstable

Please check whether there is bubble or air in the glass end ofthe electrode; maintain the electrode or change a new electrode, and make another calibration.

During calibration, the buffer solution temperature exceedsthe range of 5~50°C2. The buffer can not be identified.

1. Please adjust the buffer solution temperature to the appropriate temperature range and make another calibration.

2. Please replace the buffer, or maintain or replace the electrode and make another calibration.

Serious error that does not permit any further measuring

Please call service engineer.

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6. Maintenance

6.1 Battery Replacement a. Turn off the instrument power first.

b. Open the battery cover, and remove the old batteries.

c. Put into the new AA batteries, and close the battery cover.

6.2 Electrode clean and maintenance

Generally speaking, under normal operation, the transmitter produced by our company needs no maintenance expect regular cleaning and calibration of the electrode to ensure accurate and stable measurement and system operation.

The cleaning cycle for the electrode depends on the pollution degree of the measurement sample. Normally, it is recommended to make weekly cleaning. The following chart gives introductions of different cleaning methods according to different type of contaminations to provide the operators with reference for cleaning and maintenance.

Type of Contaminations Cleaning methods

Measuring solutions containing proteins. Contamination of the junction

The electrode should be soaked in Pepsin/HCl for several hours. METTLER-TOLEDO 9891 Electrode Cleaner is recommended.

Measuring solution containing sulfides. The junction becomes black

The junction should be soaked in Thiourea/HCl solution until being bleached. METTLER-TOLEDO 9892 Electrode Cleaner is recommended.

Contamination by grease or organic substance

Short rinsing of the electrode with acetone and ethanol.

Acid and alkaline soluble contaminations

Rinsing the electrode with 0.1mol/l NaOH or 0.1mol/l HCl for a few minutes.

Apply clean water to flash the electrode after above cleaning steps and immerse the electrode in 3M KCl solution for 15 minutes at least, and then calibrate the electrode.

The electrode should only be rinsed and never rubbed or mechanically cleaned, since this would lead to electrostatic charges. This could cause an increase in the response time.

In cleaning the platinum electrode, the platinum ring of the electrode can be rubbed gently with a wet soft piece of cloth.

The frequency of electrode cleaning depends on the type and degree of contamination. However it is recommended that the electrode be cleaned once a week.

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7. Modbus protocol and instructions

7.1 Function code

In the original Modbus protocol definition, there are many command functions on the substance of duplication. Base on the reason, SP-2300/2500 only supports some of the function codes. When starting communication, the Master sends the request through function code to tell the Slave to perform which actions. The Slave responds function which is the same as that sent by the Master to indicate the Slave has already responded to the Master and has performed the action.

The range of function code is 1~255. In between, the function code 128~255 are defined as abnormal responding function code. The function codes which the slaves normally respond are the same as those from the Master. The highest bit(MSB) is 0. When the slaves respond abnormal message, the lowest bit(LSB) of function codes is the same as those of the master, however, the highest bit(MSB) of the function codes are set to be 1. It means that there occurs a error when executing the function codes. The following table lists the function codes supported by SP-2300/2500

Function code Definition Operation

01H Read Coil Status

Reads the ON/OFF status of discrete coils in the slave

Read the status of one or more discrete contacts

03H Read Holding Registers

Read the binary contents of holding registers in the slave

Read one or more data register value

05H Write Single Coil

Writes a single coil to either ON or OFF.

Set the status of discrete individual contacts to the specified address

06H Write Single Register

Writes a value into a single holding register

Set a single 16-bit data register

0FH Write Multiple Coils

Writes each coil in a sequence of coils to either ON or OFF

Set the status of multiple discrete continuous contacts to the specified

address 10H Write Multiple Registers

Writes values into a sequence of holding registers

Set multiple sequence of 16-bit data register

08H Diagnostics

Diagnostics function The assessment of network communication capability

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7.2 MODBUS name and address table

Function Code 03H, 06H, 10H Modbus response (setup parameter) Logic

address Item Number of Byte

Information type

Description of data transmission

Default value Note

0001H Equipment’s ID 2 USHORT 1 1 SP2300

0002H Meter’s model 6 USHORT ASCII Code SP2500

0 RTU 0005H Communication protocol 2 USHORT

1 ASCII 1

1 2400 2 4800 0006H

Serial transmission speed (Baud

rate)

2 USHORT 3 9600

2

0: None 1: Even 0007H Parity 2 USHORT 2: Odd

0

0008H USHORT Second 0009H USHORT Minute 000AH USHORT Hour 000BH USHORT Day 000CH USHORT Month 000DH

Real-time clock* 12

USHORT Year

2011-01-0100 00

00

The actions without * sign only support for function code 03H. The actions with * sign support function code 03H, 06H, 10H. USHORT data range from 0 to 65535, SHORT data range from -32768 to 32767. FLOAT is a 4 data bits IEEE format float. The data range follows is the same.

Function code: 03H Modbus response (measurement parameter) Logic

address Item Number of Byte

Information type

Description of data transmission

Default value Note

0031H Number of

measurement channels

2 USHORT SP2300/SP2500

only has one channel 1

pH ORP(mV)

�C ppm(SP-2500 only)

0032H Sign byte 6 CHAR

mg/l(SP-2500 only)

ASCII code

0035H pH/ORP/ION measurement 4 FLOAT

pH/ORP/Ion (Ion SP-2500 only) measurement

Data affected by sign byte

0037H Temperature measurement 4 FLOAT Temperature

measurement Data affected by sign byte

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8. Appendix

Table 1 CT Mode Tech. Buffers TEMP Buffer 4.01 Buffer 7 Buffer 10

5 3.999 7.087 10.241 10 3.998 7.053 10.155 15 3.999 7.031 10.116 20 4.002 7.011 10.047 25 4.006 6.996 9.998 30 4.011 6.985 9.952 35 4.018 6.976 9.925 40 4.031 6.971 9.874 45 4.047 6.969 9.843 50 4.055 6.969 9.810

Table 2 CN Mode NIST. Buffers(DIN 19266) TEMP Buffer 1.68 Buffer 4.01 Buffer 6.86 Buffer 9.18 Buffer 12.45

5 1.668 4.004 6.951 9.395 13.207 10 1.670 4.000 6.923 9.332 13.003 15 1.672 3.999 6.900 9.276 12.810 20 1.675 4.001 6.881 9.225 12.627 25 1.679 4.006 6.865 9.180 12.454 30 1.683 4.012 6.853 9.139 12.289 35 1.688 4.021 6.844 9.102 12.133 40 1.694 4.031 6.838 9.068 11.984 45 1.700 4.043 6.834 9.038 11.410 50 1.707 4.057 6.833 9.011 11.705

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Table 3 CD Mode Define standard buffers table TEMP Buffer 1 Buffer 2 Buffer 3 Buffer 4 Buffer 5

5 2.010 4.040 7.070 9.160 12.410 10 2.010 4.020 7.050 9.110 12.260 15 2.000 4.010 7.020 9.050 12.100 20 2.000 4.000 7.000 9.000 12.000 25 2.000 4.010 6.980 8.950 11.880 30 2.000 4.010 6.980 8.910 11.720 35 2.000 4.010 6.960 8.880 11.670 40 2.000 4.010 6.950 8.850 11.540 45 2.000 4.010 6.950 8.820 11.440 50 2.000 4.000 6.950 8.790 11.330

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SUNTEX INSTRUMENTS CO., LTD.

13F, No. 31, Lane 169, Kangning St., Xizhi Dist., New Taipei City, Taiwan (R.O.C.) Tel: 886-2-2695-9688 Fax: 886-2-2695-9693 e-mail: [email protected] www.suntex.com.tw/en

5040C SP-2300_2500/Technical data subject to alternations/ Quality Systems ISO 9001/201111

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