Thermo Fisher Scientific Eutech 2700 Series - Manual (Page 46)

42
20.
Calculating Temperature Coefficients
To determine the temperature coefficient of your sample solution use this formula:
Where:
tc = Temperature coefficient 25 = 25 ºC
C
T1
= Conductivity at Temp 1 C
T2
= Conductivity at Temp 2
T1 = Temp 1 T2 = Temp 2
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 10—Temperature Coefficient .
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 C
T2
.
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 .