27
Rev. 1 20.12.2019
EN
Compensation coefficients for calibration standards at different temperatures for T
ref
25 ° C are
shown in the following table:
°C
0.001 mol/L KCl (147µS)
0.01 mol/L KCl (1413 µS)
0.1 mol/L KCl (12.88 mS)
0
1.81
1.81
1.78
15
1.92
1.91
1.88
35
2.04
2.02
2.03
45
2.08
2.06
2.02
100
2.27
2.22
2.14
To determine the calibration coefficient of a solution, the following formula is applied:
𝑡𝑐 = 100𝑥
𝐶
𝑇2
− 𝐶
𝑇1
𝐶
𝑇1
(𝑇
2
− 25) − 𝐶
𝑇2
(𝑇
1
− 25)
Where tc is the temperature coefficient to be calculated, C
T1
and C
T2
are Conductivity at temperature 1 (T1)
and at temperature 2 (T2).
Any result with "correct" temperature is plagued by an error caused by the temperature coefficient. The
better the temperature correction, the lower the error. The only way to eliminate this error is not to use the
correction factor, acting directly on the temperature of the sample.
Select 0.00% / °C as the temperature coefficient to deactivate the compensation. The displayed Conductivity
value refers to the temperature value measured by the probe and not related to a reference temperature.
P3.6 Conductivity Calibration Data
Access this menu to get information on the last calibration performed. The following screens will
automatically scroll on the display.
First screen: beakers indicating the buffers used for calibration.
Second and possibly third, fourth and fifth screens: Value of the actual cell constant in the
measurement range indicated by the beaker.
Note: The instrument only accepts calibrations with a maximum tolerance of 40% on the nominal value
of the cell constant
P3.8 Reset of the COND Parameter
If the instrument does not work perfectly or incorrect settings have been made, confirm YES with the key
to return all the parameters of the pH menu to the default settings.
P3.9 Temperature calibration
All the instruments in these series are pre-calibrated for a correct temperature reading. If, however, there is
a difference between the measured and the real one (usually due to a probe malfunction) it is possible to
perform an offset adjustment of + 5°C.
