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110 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Troubleshooting
To return to normal operation:
1. Reconnect the 4-wire cable between the core processor and the transmitter (see Figure B-3 or
Figure B-4).
2. Replace the core processor lid.
Note: When reassembling the meter components, be sure to grease all O-rings.
Figure 11-1 Core processor resistance test
11.25 Checking sensor coils and RTD
Problems with sensor coils can cause several alarms, including sensor failure and a variety of
out-of-range conditions. Testing the sensor coils involves testing the terminal pairs and testing for
shorts to case.
11.25.1 Remote core processor with remote transmitter installation
If you have a remote core processor with remote transmitter (see Figure B-1):
1. Power down the transmitter.
2. Remove the end-cap from the core processor housing.
3. At the core processor, unplug the terminal blocks from the terminal board.
4. Using a digital multimeter (DMM), check the pickoff coils listed in Table 11-13 by placing the
DMM leads on the unplugged terminal blocks for each terminal pair. Record the values.
40 kΩ –50 kΩ
20 kΩ – 25 kΩ
20 kΩ – 25 kΩ
40 kΩ –50 kΩ
20 kΩ – 25 kΩ
Enhanced core processorStandard core processor