Emerson MMI-20019043 Manuel D’Utilisation

Flow indication at no
flow conditions or
zero offset

•

Misaligned piping (especially in new in-
stallations)

•

Open or leaking valve

•

Incorrect sensor zero

•

Verify that all of the characterization parame-
ters match the data on the sensor tag.

•

If the flow reading is not excessively high, re-
view the live zero. You may need to restore
the factory zero.

•

Check for open or leaking valves or seals.

•

Check for mounting stress on the sensor
(e.g., sensor being used to support piping,
misaligned piping).

•

Contact Micro Motion.

Erratic non-zero flow
rate under no-flow
conditions

•

Leaking valve or seal

•

Slug flow

•

Plugged or coated flow tube

•

Incorrect sensor orientation

•

Wiring problem

•

Vibration in pipeline at rate close to sen-
sor tube frequency

•

Damping value too low

•

Mounting stress on sensor

•

Verify that the sensor orientation is appropri-
ate for your application (refer to the sensor
installation manual).

•

Check the drive gain and the pickoff voltage.
See 

•

If the wiring between the sensor and the
transmitter includes a 9-wire segment, verify
that the 9-wire cable shields are correctly
grounded.

•

Check the wiring between the sensor and
transmitter. See 

.

•

For sensors with a junction box, check for
moisture in the junction box.

•

Purge the flow tubes.

•

Check for open or leaking valves or seals.

•

Check for sources of vibration.

•

Verify damping configuration.

•

Verify that the measurement units are con-
figured correctly for your application.

•

Check for slug flow. See 

•

Check for radio frequency interference. See 

.

•

Contact Micro Motion.

Troubleshooting

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