Check The Sensor Coils - Emerson Micro Motion 5700 Configuration And Use Manual

Troubleshooting
Possible cause
Moisture inside the sensor junction
box
Liquid or moisture inside the sensor
case
Internally shorted feedthrough
Faulty cable
Improper wire termination
15.30.1

Check the sensor coils

Checking the sensor coils can identify a cause for a no sensor response alert.
Restriction
This procedure applies only to 9-wire remote-mount transmitters and remote transmitters with
remote core processors.
Procedure
1.
2.
3.
244
Disconnect power to the transmitter.
CAUTION!
If the transmitter is in a hazardous area, wait 5 minutes before continuing.
Unplug the terminal blocks from the terminal board on the core processor.
Using a digital multimeter (DMM), check the pickoff coils by placing the DMM leads
on the unplugged terminal blocks for each terminal pair. See
the coils. Record the values.
Table 15-17: Coils and test terminal pairs
Coil
Drive coil
Left pickoff coil (LPO)
Right pickoff coil (RPO)
Resistance temperature detector
(RTD)
Lead length compensator (LLC)
Composite RTD
Recommended action
Ensure that the junction box is dry and no corrosion is
present.
Contact customer support.
Contact customer support.
Replace the cable.
Verify wire terminations inside the sensor junction box. See
the Micro Motion document titled, 9‐Wire Flowmeter Cable
Preparation and Installation Guide.
Sensor model
All
All
All
All
All except T-Series and CMF400 (see
note)
CMFS025-150 and T-Series
Micro Motion Model 5700 with Ethernet Transmitters
Table 15‐17 for a list of
Terminal colors
Brown to red
Green to white
Blue to gray
Yellow to violet
Yellow to orange
Yellow to orange