152 Micro Motion Series 1000 and Series 2000 Transmitters
Troubleshooting
12.25.5 Low pickoff voltage
See Table 12-10 for a list of possible causes of low pickoff voltage.
12.26 Checking the core processor
Two core processor procedures are available:
• You can check the core processor LED. The core processor has an LED that indicates different
meter conditions. See Table 12-11.
• You can perform the core processor resistance test to check for a damaged core processor.
12.26.1 Checking the core processor LED
To check the core processor LED:
1. Determine your installation type. See Section 1.3 and refer to Appendix B for diagrams.
2. Maintain power to the transmitter.
3. If you have a 4-wire remote installation or a remote core processor with remote transmitter
installation:
a. Remove the core processor lid. The core processor is intrinsically safe and can be opened
in all environments.
b. Check the core processor LED against the conditions described in Table 12-11 (standard
core processor) or Table 12-12 (enhanced core processor).
c. To return to normal operation, replace the lid.
Table 12-9 Erratic drive gain causes and remedies
Cause Possible remedy
Wrong K1 characterization constant for sensor Re-enter the K1 characterization constant. See
Section 6.2.
Polarity of pick-off reversed or polarity of drive reversed Contact Micro Motion. See Section 12.3.
Slug flow See Section 12.17.
Foreign material caught in flow tubes Purge flow tubes or replace sensor.
Table 12-10 Low pickoff voltage causes and remedies
Cause Possible remedy
Faulty wiring runs between the sensor and core processor Verify wiring. Refer to Appendix B for diagrams, and see
your transmitter installation manual.
Process flow rate beyond the limits of the sensor Verify that the process flow rate is not out of range of the
sensor.
Slug flow See Section 12.17.
No tube vibration in sensor Check for plugging.
Ensure sensor is free to vibrate (no mechanical binding).
Verify wiring.
Test coils at sensor. See Section 12.27.
Moisture in the sensor electronics Eliminate the moisture in the sensor electronics.
The sensor is damaged Contact Micro Motion.
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