Process Unit 73 LF - Knick

With TC correction
T ref = 25 °C
With TC correction
T ref 25 °C
Take a sample from the process. The sample
value can be measured using the portable Knick
Model 911 Cond (with TC linear, EN 27888, or ultrapure
water NaCl) or the Laboratory Conductivity
Meter 703 (only with TC linear), for example. Be
sure that the same values are set for reference
temperature and temperature coefficient in the
comparison meter and in the Process Unit 73 LF.
Furthermore, the measuring temperature should
correspond to the sample temperature (see display).
Therefore, you should transport the sample
in an insulated container (Dewar).
Take a sample from the process. The sample
value can be measured using a second Process
Unit 73 LF (installed in the lab), for example. Be
sure that the same values are set for reference
temperature and temperature coefficient in the
comparison meter and in the Process Unit 73 LF.
Furthermore, the measuring temperature should
correspond to the sample temperature (see display).
Therefore, you should transport the sample
in an insulated container (Dewar).
Sample calibration can only be performed if the
process medium is stable. That means, for example,
that there are no chemical reactions which
have an effect on the process conductivity.
At higher temperatures, the sample value can also
be invalidated due to evaporation.
When the sample value has been determined,
open the “Sample Cal” submenu again.
The measured sample temperature and the stored
value are displayed.
Furthermore, you can see whether calibration is
performed with or without TC correction.
Enter the measured sample value (“Lab Value”)
and confirm with .
Pressing or returns you to the calibration
menu.
Pressing accesses the measuring mode.
Calibration 6–11