WIKA T16.H Betriebsanleitung Seite 26

8. Faults
Fault tree
l = 0 mA
EN
l > 20 mA
l < 4 mA
4 mA < l < 20 mA
but wrong values
Current value is correct, but a temperature
drift is noticeable while transmitter is heating
up or cooling down
Current value falls while the measured
temperature rises (and the other way around)
Current value is unstable and changes within
seconds
Current value is okay at low temperature
values, but too low at higher temperatures
26
Current loop disconnected
Transmitter not connected
Voltage supply connected
incorrectly (wrong polarity)
Process temperature out of
measuring range
Sensor break
Sensor connected incorrectly
Wrong transmitter
configuration
Wrong polarity of
thermocouple
Electromagnetic
interferences
Load too high
Sensor Thermocouple
= TC reversed
Wrong sensor type
Wrong temperature
range
Sensor
Wrong compensation
= TC
Capacitive or inductive
coupling via the sensor
Capacitive or inductive
coupling via the current loop
WIKA operating instructions model T16