Endress+Hauser iTEMP PCP TMT 121 Operating Instructions Manual page 18

Trouble-shooting
18
9.2.2 Application errors for RTD connection
Pt100/Pt500/Pt1000/Ni100
Error Cause
Defective sensor
Incorrect connection of RTD
Incorrect connection of the 2-wire
cable
Fault current No power supply on the 2-wire
(≤ 3.6 mA or ≥ 21 mA) connection
Incorrect transmitter programming
(number of wires)
Programming
Defective device
Error Cause
Faulty sensor installation
Heat conducted by sensor
Transmitter setup faulty (number of
wires)
Transmitter setup faulty (scale)
Measured value incorrect/
inaccurate
Incorrect RTD setup
Sensor connection (2-wire)
Sensor cable resistance (2-wire) not
compensated
Offset incorrectly set
9.2.3 Application errors for TC connection
Error Cause
Incorrect connection of sensor
Defective sensor
Setup
Fault current
(≤ 3.6 mA or ≥ 21 mA)
Incorrect 2-wire connection (current
loop)
No power supply on the 2-wire
connection
Defective device
Temperature DIN rail transmitter
Action/cure
Check sensor
Connect cables correctly to terminal
schematic
Connect cables correctly to terminal
schematic (polarity)
Check current loop; the supply
should be > 12 V
Change device function 'Connection
mode' (see chap. 'Commissioning')
Thermocouple setup (see chap.
'Commissioning'). Change to RTD
Replace device
Action/cure
Install sensor correctly
Take note of sensor installation point
Change device function 'Connection
mode'
Change scale
Change device function 'Sensor type'
Check sensor connection
Compensate cable resistance
Check offset
Action/cure
Connect cables correctly to terminal
schematic (polarity)
Check sensor
Incorrect sensor type setup under
device function 'Sensor type'; setup
correct thermocouple
Connect the cables correctly (see
connection diagram)
Check current loop; the supply
should be > 12 V
Replace device
Endress+Hauser