Thermo Fisher Scientific Alpha CON 100 - Manual (Page 27)

24
Appendix 2
Temperature Coefficient
The Temperature Coefficients (TC) of most solutions vary
between 1.8 to 2.4 % per
o
C. This is true of most salt solutions
when the Conductivity exceeds about 100 uS. Thus, the default
value of TC will be set to 2.10 % per
o
C when the Controller is
shipped from the factory. However, if the Temperature
Coefficient is known to be different from the default, the user
can set this value.
Temperature Coefficient can also be determined by taking 2
uncompensated readings at known temperatures.
Uncompensated readings can be taken by setting TC to 0.0 %
or setting the temperature to 25
o
C by changing ATC ON to ATC
OFF.
If G1 and G2 are the conductivity measured at two
temperatures T1 and T2, then TC is given by the relation:
% TC = ----------------------------------------
G1(T2 - 25) - G2(T1-25)
G2 - G1
* 100