Check Flow Direction; Check The Cutoffs; Check For Two-Phase Flow (Slug Flow) - Emerson Micro Motion 1500 Configuration And Use Manual

3.
10.22

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.
2.
10.23

Check the cutoffs

If the transmitter cutoffs are configured incorrectly, the transmitter may report zero flow
when flow is present, or very small amounts of flow under no-flow conditions.
There are separate cutoff parameters for mass flow rate, volume flow rate, gas standard
volume flow rate (if applicable), and density. There is an independent cutoff for the mA
Output on your transmitter. The interaction between cutoffs sometimes produces
unexpected results.
Procedure
Verify the configuration of all cutoffs.
Tip
For typical applications, set Mass Flow Cutoff to 0.5% of the nominal flow rate of the attached sensor.
See the sensor specifications for nominal flow rate data.
10.24

Check for two-phase flow (slug flow)

Two-phase flow can cause rapid changes in the drive gain. This can cause a variety of
measurement issues.
1.
Configuration and Use Manual
Restriction
For some status alerts, Alert Severity is not configurable.
If there are no active fault conditions, continue troubleshooting.
Verify the actual direction of process flow through the sensor.
Verify the configuration of Flow Direction.
Check for two-phase flow alerts (e.g., A105).
If the transmitter is not generating two-phase flow alerts, verify that two-phase flow
limits have been set. If limits are set, two-phase flow is not the source of your
problem.
Troubleshooting
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