VEGA T32.10-11-30 - Handbuch (Seite 28)

GB
2383336 12/2008 GB/D
28 WIKA Operating Instructions Temperature Transmitter T32.10/11/30
14. Troubleshooting
Fault-tree
Wrong sensor type
Wrong 2-, 3- or
-wire connection
Wrong
temperature range
Wrong
compensation
Capacitive or
inductive coupling
over the sensor
Capacitive or
inductive coupling
over the loop
Sensor =
TC
Wrong polarity of
thermocouple
Loop resistance too high
Electromagnetic
interferences
Linearization error for
sensor / transmitter
Sensor =
RTD
l = 0 mA
l > 20 mA
l <  mA
 mA < l < 20 mA
but wrong values
I = okay, but temperature drift
while transmitter is heating up
or cooling down
Output current falls while
measuring temperature rises
and vice versa
I = okay at low values, but too
low at higher temperatures
I is unstable and changes
within seconds
Values only correct at the
measuring limits
Current loop
disconnected
Wrong polarity of
the supply voltage
Transmitter not
connected
Process tempera-
ture out of range
Wrong sensor
connection
Sensor burnout or
short circuit
Wrong transmitter
configuration