Procedure
Verify the configuration of Frequency Output Mode.
15.23 Check Frequency Output Fault Action
The Frequency Output Fault Action controls the behavior of the Frequency Output if the transmitter
encounters an internal fault condition. If the Frequency Output is reporting a constant value, the transmitter
may be in a fault condition.
Procedure
1. Check the status alerts for active fault conditions.
2. If there are active fault conditions, the transmitter is performing correctly. If you want to change its
behavior, consider the following options:
• Change the setting of Frequency Output Fault Action.
Restriction
3. If there are no active fault conditions, continue troubleshooting.
15.24 Check the direction parameters
If the direction parameters are set incorrectly, flow rate may be reported as reverse when it is actually
forward, or vice versa. Totalizers and inventories may increment when they should decrement, or vice versa.
The reported flow rate and flow totals depend on the interaction of four factors: the flow direction arrow on
the sensor, actual flow direction, the Sensor Flow Direction Arrow parameter, the Direction parameter for
the mA output or the frequency output, and the Totalizer Direction parameter.
Procedure
1. Ensure that Sensor Flow Direction Arrow is set correctly for your sensor installation and your process.
2. Verify the configuration of mA Output Direction, Frequency Output Direction, and Totalizer
Direction.
15.25 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.
Procedure
Verify the configuration of all cutoffs.
15.26 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.
Procedure
1. Check for two-phase flow alerts (e.g., A105).
Troubleshooting Configuration and Use Manual
April 2019 MMI-20048166
196 Micro Motion 4200 Transmitters
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