Liquisys M CLM223/253 Maintenance
Endress+Hauser 93
Values for simulation with CLS50 at 25 °C (77 °F):
Simulation resistance R Default cell constant k Conductivity reading
2 Ω 1.98 cm
-1
990 mS/cm
10 Ω 1.98 cm
-1
198 mS/cm
100 Ω 1.98 cm
-1
19.8 mS/cm
1 kΩ 1.98 cm
-1
1.98 mS/cm
Simulation with CLS54 at 25 °C (77 °F):
Simulation resistance R Default cell constant k Conductivity reading
10 Ω 6.3 cm
-1
520 mS/cm
26 Ω 6.3 cm
-1
200 mS/cm
100 Ω 6.3 cm
-1
52 mS/cm
260 Ω 6.3 cm
-1
20 mS/cm
2.6 kΩ 6.3 cm
-1
2 mS/cm
26 kΩ 6.3 cm
-1
200 μS/cm
52 kΩ 6.3 cm
-1
100 μS/cm
Conductivity simulation:
Pull a cable through the sensor opening and then connect it to a decade resistor, for
instance.
9.1.5 Checking conductive sensors
• Measuring surface connection:
The measuring surfaces are directly connected to the connections of the sensor
connector. Check with ohmmeter for < 1 Ω.
• Measuring surface shunt:
A shunt is not permitted between the measuring surfaces. Check with ohmmeter for >
20 MΩ.
• Temperature sensor shunt:
A shunt is not permitted between the measuring surfaces and the temperature sensor.
Check with ohmmeter for > 20 MΩ.
• Temperature sensor:
See the sensor nameplate for information on the type of the temperature sensor being
used.
The sensor can be checked at the sensor connector with an ohmmeter:
– Pt 100 at 25 °C (77 °F) = 109.79 Ω
– Pt 1000 at 25 °C (77 °F) = 1097.9 Ω
– NTC 30 k at 25 °C (77 °F) = 30 kΩ
• Terminal:
For sensors with a terminal connection (CLS12/13) check the assignment of the
terminals to ensure they have not been inadvertently interchanged. Check the tightness
of the terminal screws.
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