How can a sample specific linear temperature correction factor be calculated for Conductivity?

Document ID

Document ID TE10669

Published Date

Published Date 09/20/2021
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Question
How can a sample specific linear temperature correction factor be calculated for Conductivity?
Summary
Instructions for calculating sample specific temperature correction factor for conductivity measurement.
Answer
For information on what Temperature correction is for conductivity please see: What's the difference between temperature compensation and temperature correction? (pH verses Conductivity temperature adjustments)

It is possible to calculate a linear temperature correction factor that is sample specific. To do this first the temperature correction would need to be turned off so that a reading can be taken that is not influenced by another temperature correction that is assumed to be incorrect. On the IntelliCAL™ CDC401 this can be done by selecting the wrench button>CDC401 settings>Modify Current Settings>Measurement options>Temperature Correction, and select none.

Collect a sample that will be representative of the sample matrix that future measurements will be taken on, and take a reading on that sample at two different temperatures. We would want these two temperatures to bracket the temperature range that you would expect to see with future samples. Record the following variables:

C1= EC reading on the cooler sample
T1= Temperature reading on the cooler sample in °C
C2= EC reading on the warmer sample
T2= Temperature reading on the warmer sample in °C

Then use this formula to calculate a sample specific temperature correction factor.


This information is from the Conductivity Theory and Practice document which can be found here: Where can additional information on conductivity theory be found?

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