Commissioning Liquisys M CLM223/253
64 Endress+Hauser
Value entry
Enter the three characteristic values for each measured sample in the fields K6 to K8 (value
triplets of uncompensated conductivity, temperature and concentration).
• Variable process temperature:
Enter at least four value triplets.
• Constant process temperature:
Enter at least two value triplets.
• Please make sure that the concentrations and temperatures measured for your samples
correspond to the measuring range of the process. If the measured values of the process
are outside the range of your sample values, this considerably reduces the level of accuracy
and the error message E078 or E079 will be displayed.
If you enter an additional value triplet of 0 μS/cm and 0 % for each temperature used, you
can work from the start of measuring range with sufficient accuracy and without an error
message.
Enter the values in the order of increasing concentration (see the following example).
• The setups for temperature compensation in the menu Setup 2 (fields B2 and B3) are
inoperative for the concentration measurement. The temperature is already processed by
the concentration tables.
a0008925
Fig. 36: Measured data for a constant process temperature (example)
C
Conductivity
Concentration
T
1
Constant temperature
Measuring range
The characteristics received from the
measuring points must be strictly
monotonously increasing or strictly
monotonously decreasing in the range of the
process conditions. Therefore, neither
maxima / minima nor ranges with a
constant behaviour can occur. Curve profiles
such as those in Fig. 37 are not permitted.
a0008927
Fig. 37: Impermissible curve profiles
Conductivity
C Concentration
mS/cm % °C
240 96 60
380 96 90
220 97 60
340 97 90
120 99 60
200 99 90
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