WIKA T32.1S, Руководство по эксплуатации, Страница: 36 / 80

EN
11258421.13 10/2017 EN/DE
WIKA operating instructions model T32.xS 36
12. Faults
Fault-tree
Current loop disconnected
Wrong polarity of the supply
voltage
Transmitter not connected
Wrong sensor type
Wrong 2-, 3- or 4-wire
connection
Wrong temperature range
Wrong compensation
Sensor
= TC
l > 20 mA
l < 4 mA
4 mA < l < 20 mA
but wrong values
Current value is okay, but temperature drift
while transmitter is heating up or cooling down
Process temperature out of range
Wrong sensor connection
Sensor burnout or short circuit
Wrong transmitter configuration
Capacitive or inductive
coupling over the sensor
Capacitive or inductive
coupling over the loop
Wrong polarity of
thermocouple
Loop resistance too high
Electromagnetic interferences
Linearization error for sensor /
transmitter
Current value falls while measuring
temperature rises (and vice versa)
Current value is okay at low values,
but too low at higher temperatures
Current value is unstable and
changes within seconds
Temperature values only correct at
the measuring limits
CAUTION!
If deficiencies cannot be eliminated by means of the measures listed above,
shut down the instrument immediately, and ensure that pressure and/or signal
are no longer present, and secure the instrument from being put back into
operation inadvertently. In this case, contact the manufacturer.
If a return is needed, please follow the instructions given in chapter 13.1
“Return” and enclose a short description of the problem, details of ambient
conditions as well as period of operation before the problem occurred with the
temperature transmitter.
Sensor
= RTD
l = 0 mA
12. Faults