3 hour tour - Home - One Water Ohio...2018/08/28 · TL2300 Tungsten TU5200 650nm Range 0-4000NTU...
Transcript of 3 hour tour - Home - One Water Ohio...2018/08/28 · TL2300 Tungsten TU5200 650nm Range 0-4000NTU...
ClearResultsAccuracy You Can Count On
Eric LinkLabtronX
I. Accuracy vsprecision
A digital alarm clock assures precision…but not accuracy
Accuracy Is…
Getting close to the bullseye
Precision is…
Gettingthe same results
When is it close enough?
II. Standards vs Readability
What is an Acre?
8 Furlongs Or 80 chains Or 320 Rods
1 Furlong long by1 Chain wide (4 Rods)
LENGTH OF A MILE?
Or 660 x 66 feet
Or 5280 feet
An Inch, A Foot, and A Yard
The Metrics of water
1 cubic cm of water =
1mL =
1g @ 25C
@ 1hpa
(Or 1mbar/22.92inhg)
@sea level
How do you report? Standard must be
more accurate than normal reported reading
Can not report more information than you have
Do not report Precision
Sensor +/-2.2C
Meter Resolution +/-0.1C
Meter Accuracy +/-0.1% + 0.7C
Each degree of Ambient Temperature above 28C or below 18c add 0.01% + 0.03C
Benchtop Turbidimeter
TL2300Tungsten
TU5200650nm
Range 0-4000NTU 0-40NTU
Resolution 0.001NTU 0.0001NTU
Repeatability 1% or 0.01NTU
1% or 0.002NTU
Accuracy 2% + 0.01NTU
2% + 0.01NTU
Readability
Precision
III. Being Proactive
In 1492 Columbus Sailed the Ocean Blue
He landed in the
Bahamas!
He proposed to sail west from the Canary Islands in hopes to find Japan and the riches of the East Indies.
Steven Callahan in 1982
In January , Steven Callahan set sail from the Canary Islands to solo the Columbus voyage
Steven Callahan in 1982• 6 days later, in the middle of the Atlantic Ocean, the boat sank
• He was left with a 5 foot life raft, 3 pounds of food, 8 pints of water, a solar still, and a makeshift spear
• 6 days later, in the middle of the Atlantic Ocean, the boat sank
• He was left with a 5 foot life raft, 3 pounds of food, 8 pints of water, a solar still, and a makeshift spear
Adrift : 76 Days Lost at Sea• He had to get food and fresh water and contend with the sun and
sharks
• 43 days later his raft sprung a leak that he could not patch
• He kept the boat afloat manually 33 more days, until his rescue
• Adrift on the currents, he traveled over miles
• He had to get food and fresh water and contend with the sun and sharks
• 43 days later his raft sprung a leak that he could not patch
• He had to get food and fresh water and contend with the sun and sharks
• 43 days later his raft sprung a leak that he could not patch
If you do nothing you WILL get somewhere (it may be miles)
If you do something you WILL get closer to where you want to go
Being reactive…dealing withthe day to day problems,is just surviving
Instead,decide where you want to goand chart a course
Where are you now?
IV. As FoundvsAs Left
The Basics of Navigation
He may have landed in Trinidad instead
of the Bahamas
If Columbus would have steered 270° 0
90
180
270 225
270
240
We know that accuracy and reliability
of lab equipmentdrifts overtime
Temperature Change
MoistureCorrosive Gasesand Chemicals
DustDirtInsects
StainedScratchedLenses & Glassware
Mechanical Parts
Consumable Parts
Vibration
Electrical Problems
A calibration and maintenance programMakes course correctionsBefore you drift too farFrom where you want to be
Clean, Calibrate, and Perform Periodic Maintenance
AS FOUND readingsWhere you were may not beWhere you wanted to be
AS FOUND
AS LEFT
DRIFT
The Difference betweenAS FOUND and AS LEFTEquals the DRIFT
DRIFT can help determineThe frequency of calibrationFor reliable and accurate readings
LabtronX Calibration RecommendationsTwice per year: All critical and reporting equipment
Frequent AS FOUND failures: may require additional calibration or investigation into the cause of the drift.
For systems using continuous turbidity monitoring, Chapter 109.301(1)(i)(B) requires at a minimum,calibration with an EPA-approved primary standard shall be conducted at least quarterly.
Verification should be done regularly to ensure accuracy
V. How do you know?
How do you know?I see the reported number but…
You did the proper test but…
You calibrated the meter but…
You used standards but…
Paperwork
Diploma of ‘How you know’
Unique ID
Equipment and Standards
Make/Model
Type
Serial Number
Nominal Value
Stated Value
Units
(Calculated)
AS FOUND
Meter Reading
Units
Must not damage standard
AS LEFT
Meter Reading
Units
Even without calibration
Pass/Fail
Agreed Standard deviation
Uncertainty caused by test method or standard
Correction Factor
Add or Subtract
Units
Not Deviation
Standard Documentation
Certificate with ID
Origin Date
Replacement Date
Last Verified
Test Method and/or equipment
conditions and uncertainty
Questions?
LabtronX800-830-2554