Liquisys M CLM223/253 Commissioning
Endress+Hauser 55
EP-PW function: For "Purified Water" (PW) according to the standard of EP the transmitter
uses the temperature depending limit values of the following table:
The measurement is performed as follows:
• The transmitter determines the uncompensated conductivity and the water temperature .
• The transmitter determines the conductivity limit value by interpolation of two table
values.
• If the measured value exceeds the table value an alarm (E151) will be triggered.
Prealarm: Also available is a pre-alarm with a user defined switch-on point (e.g. 80 % of the
USP/EP value). This gives the user a signal for the in-time regeneration of the system. Enter
the value in field R262 or R272.
Pay attention to the following:
• To use the USP and EP functions the transmitter has to be equipped with a relay board and
the Plus Package.
• For alarm output, activate the fault-signalling contact or the error current in field F5 - F7
(error code E151 and E153).
• The switch-off point of the pre-alarm is 1 % below of the switch-on point (R262 / R272),
related to the main limit value.
• The transmitter uses uncompensated values for the USP and EP functions even in case
temperature compensated values are displayed.
• At temperatures above 100 °C (212 °F) the transmitter uses the limit value of 100 °C
(212 °F).
Temperature [°C/°F] Conductivity [μS/cm] Temperature [°C/°F] Conductivity [μS/cm]
0/32 2.4 60/140 8.1
10/50 3.6 70/158 9.1
20/68 4.3 75/167 9.7
25/77 5.1 80/176 9.7
30/86 5.4 90/194 9.7
40/104 6.5 100/212 10.2
50/122 7.1
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