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Linear temperature correction is used, e.g. for saline
solutions, acids and leaching solutions.
k
﹦
Tref
Where:
k
﹦ Conductivity at Tref
Tref
k
﹦ Conductivity at T
T
Tref ﹦ Reference temperature
T ﹦ Sample temperature
q
﹦ Temperature coefficient
Note: the correction is accurate only within a limited
temperature range around T1 and T2. The greater the
difference between T and Tref, the higher the risk of
error.
Calculating Temperature Coefficients (
By measuring the conductivity of a sample at
temperature T1 close to Tref and another temperature
T2, you can calculate the temperature coefficient by
using the following equation:
k
k
(
-
T
﹦
q
(T
-T
2
1
T2 should be selected as a typical sample temperature
and should be approximately 10°C different from T1.
The temperature coefficients of the following
electrolytes generally fall into the ranges shown below:
Acids: 1.0 - 1.6% / °C
Bases: 1.8 - 2.2% / °C
Salts: 2.2 - 3.0% / °C
Drinking water: 2.0% / °C
Ultrapure water: 5.2% / °C
100
q
100 +
- (T-T
)
100
•
T
k
)
•
T1
k
•
T
)
ref
17
q
)
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