METS-WTEx-M
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Failure
Potential Cause
Procedure
No output signal
Cable break
Check passage
Mechanical load too high or
Replace the sensor with a suitable
overtemperature
design
No/false output signal
Incorrectly wired
Comply with pin assignment (see
product label / manual)
Erroneous measured values
Sensor drift caused by
Replace the sensor with a
overtemperature
suitable design
Sensor drift caused by chemical
Replace the sensor with a
effect
suitable design
Erroneous measured values
Entry of moisture into cable or plug
Replace the sensor with a
(too low)
suitable design
Erroneous measured values
Wrong mounting geometry,
The temperature-sensitive
and response times too long
e.g. mounting depth too low
area of the sensor has to be
or heat dissipation too high
inside the medium, surface
measurements must be
isolated
Deposits on the sensor
Remove deposits
Measurement signal
Cable break in connecting cable or
Replace the sensor with a
„comes and goes“
loose contact caused by
suitable design, e.g. with a
mechanical overload
thicker conductor cross section
Corrosion
Composition of medium not as
Analyse medium and then select
expected, modified composition
a more suitable material.
or wrong material for thermowell
Signal interference
EMC interference sources in the,
Shield sensor,
environment, e.g. converter
shield wire, remove interference
source, increase distance to
interference source
Earth circuits
Eliminate potentials,
supply isolators or galvanically
isolated measuring amplifiers
6 Fault Recovery
- Please open connections only when unpressurized.
- Take precautions for rest media in dismounted temperature sensors.
Rest media can lead to danger for persons, environment and installations.
- Shut down the temperature sensor and protect against accidental start-up if faults can’t
be eliminated.
Warning
Screw-in Resistance Temperature Sensor
Page-13
Note: Unjustified reclamations can incur additional costs.
