26
Fault tree
Current loop disconnected
Voltage supply connected
incorrectly (wrong polarity)
Transmitter not connected
Wrong sensor type
Thermocouple
reversed
Wrong temperature
range
Wrong compensation
Sensor
= TC
Sensor
= TC
l > 20 mA
l < 4 mA
Current value is correct, but a temperature
drift is noticeable while transmitter is heating
up or cooling down
Process temperature out of
measuring range
Sensor break
Capacitive or inductive
coupling via the sensor
Capacitive or inductive
coupling via the current loop
4 mA < l < 20 mA
but wrong values
l = 0 mA
Sensor connected incorrectly
Wrong transmitter
configuration
Wrong polarity of
thermocouple
Load too high
Electromagnetic
interferences
Current value falls while the measured
temperature rises (and the other way around)
Current value is okay at low temperature
values, but too low at higher temperatures
Current value is unstable and changes within
seconds
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