Check Flow Direction; Flow Measurement Problems - Emerson Micro Motion 9739 MVD Configuration And Use Manual

Troubleshooting
June 2019
f) Test the gray terminal against all other terminals except the blue one.
g) Test the orange terminal against all other terminals except the yellow and violet ones.
h) Test the yellow terminal against all other terminals except the orange and violet ones.
i) Test the violet terminal against all other terminals except the yellow and orange ones.
There should be infinite resistance for each pair. If there is any resistance at all, there is a short between
terminals.
Postrequisites
To return to normal operation:
1. Plug the terminal blocks into the terminal board.
2. Replace the transmitter housing cover.
3. Replace the lid on the sensor junction box.
Important
When reassembling the meter components, be sure to grease all O-rings.

10.6 Check Flow Direction

If Flow Direction is set inappropriately for your process, the transmitter may report flow data that is not
appropriate for your requirements.
The Flow Direction parameter interacts with actual flow direction to affect flow values, flow totals and
inventories, and output behavior. For the simplest operation, actual process flow should match the flow arrow
that is on the side of the sensor case.
Procedure
1. Verify the actual direction of process flow through the sensor.
2. Verify the configuration of Flow Direction.

10.7 Flow measurement problems

Problem Possible causes
Non-zero flow reading •
at no-flow conditions
or at zero offset
•
•
138
Misaligned piping (especially in new
installations)
Open or leaking valve
Incorrect sensor zero
Configuration and Use Manual
Recommended actions
• If the reading is not excessively high,
review 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 customer support.
Micro Motion 9739 MVD Transmitters
MMI-20016855