Checking The Temperature Sensors; Fig. 40: Resistor - Temperature Characteristic Of The Pt100 - M&C EC-30C Instruction Manual

10.5 Checking the temperature sensors

All temperature sensors of the PCU, DCU 1 and DCU 2 are PT100 sensors.
The diagram below shows the resistance - temperature characteristics of the temperature
sensor PT100.

Fig. 40: Resistor - temperature characteristic of the PT100

If there are any problems during temperature measurements, please follow these steps to
check the PT100:
Disconnect the unit from the power supply.
„
Unscrew and open the front panel, but keep it hinged to the rail at the bottom
„
plate.
Unscrew the faulty temperature sensor.
„
When the EC-30C has been in operating mode before, please wait until the
„
temperature of the PT100 has adapted to the ambient temperature.
Check the resistance of the PT100 with an ohmmeter.
„
Compare the measured value with the value of the resistance at ambient temperature
shown in the resistance- temperature diagram. If the measured value corresponds to the
diagram value with good approximation the PT100 is in working conditions. A large devi-
ation means either that the temperature of the sensor is not yet adapted to the ambient
temperature or that it is defective.
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