Possible cause
Recommended action
Moisture inside the sensor junction
box
Ensure that the junction box is dry and no corrosion is
present.
Liquid or moisture inside the sensor
case
Contact customer support.
Internally shorted feedthrough
Contact customer support.
Faulty cable
Replace the cable.
Improper wire termination
Verify wire terminations inside the sensor junction box. See
the Micro Motion document titled,
9‐Wire Flowmeter Cable
Preparation and Installation Guide
.
12.30.1
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.
Disconnect power to the transmitter.
DANGER!
If the transmitter is in a hazardous area, wait 5 minutes before continuing.
2.
Unplug the terminal blocks from the terminal board on the core processor.
3.
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 following table for
a list of the coils. Record the values.
Coils and test terminal pairs
Table 12-7:
Coil
Sensor model
Terminal colors
Drive coil
All
Brown to red
Left pickoff coil (LPO)
All
Green to white
Right pickoff coil (RPO)
All
Blue to gray
Resistance temperature detector
(RTD)
All
Yellow to violet
Lead length compensator (LLC)
All except T-Series and CMF400
(see note)
Yellow to orange
Composite RTD
All CMFSs, T-Series, H300, and
F300
Yellow to orange
Troubleshooting
192
Micro Motion Model 2500 Transmitters with Configurable Input/Outputs
Summary of Contents for Micro Motion 2500
Page 8: ...Contents vi Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 10: ...Getting started 2 Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 18: ...Quick start 10 Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 237: ...NE 53 history Configuration and Use Manual 229 ...