Randy Holmes-Farley
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I'm not sure how Oakton and Orion meters compare, but with the best modern meters you can set your own temperature coefficients:
from an Oakton Con 700:
http://www.4oakton.com/Assets/manual_pdfs/35411-00-01OaktonCON700IM.pdf
8. CALCULATING TEMPERATURE COEFFICIENTS To determine the temperature coefficient of your sample solution use this formula:
Where: tc = Temperature coefficient 25 = 25 ºC
CT1 = Conductivity at Temp 1
CT2 = Conductivity at Temp 2
T1 = Temp 1
T2 = Temp 2
NOTE: A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe into a sample of your solution and adjust the temperature coefficient to 0% (that is, no compensation) by following instructions as described in Section 6.8.
2. Wait for 5 minutes. Note T1 and CT1 (conductivity at T1).
3. Condition the sample solution and probe to a temperature (T2) that is about 5 ºC to 10 ºC different from T1, and note the conductivity reading CT2. NOTE: Record your results for future reference. Ideally T1 and T2 should bracket your measurement temperature, and should not differ by more than 5 ºC.
4. Calculate the temperature coefficient of your solution according to the formula shown above. 5. Enter the calculated temperature coefficient into the meter.
The calculated temperature coefficient will now be applied to all the meter readings.
from an Oakton Con 700:
http://www.4oakton.com/Assets/manual_pdfs/35411-00-01OaktonCON700IM.pdf
8. CALCULATING TEMPERATURE COEFFICIENTS To determine the temperature coefficient of your sample solution use this formula:
Where: tc = Temperature coefficient 25 = 25 ºC
CT1 = Conductivity at Temp 1
CT2 = Conductivity at Temp 2
T1 = Temp 1
T2 = Temp 2
NOTE: A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe into a sample of your solution and adjust the temperature coefficient to 0% (that is, no compensation) by following instructions as described in Section 6.8.
2. Wait for 5 minutes. Note T1 and CT1 (conductivity at T1).
3. Condition the sample solution and probe to a temperature (T2) that is about 5 ºC to 10 ºC different from T1, and note the conductivity reading CT2. NOTE: Record your results for future reference. Ideally T1 and T2 should bracket your measurement temperature, and should not differ by more than 5 ºC.
4. Calculate the temperature coefficient of your solution according to the formula shown above. 5. Enter the calculated temperature coefficient into the meter.
The calculated temperature coefficient will now be applied to all the meter readings.