4.2.4 Configure two-phase flow parameters
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ProLink III Device Tools > Configuration > Process Measurement > Line Density
Field Communicator Configure > Manual Setup > Measurements > Density
Overview
The two-phase flow parameters control how the transmitter detects and reports two-
phase flow (gas in a liquid process or liquid in a gas process).
Note
Two-phase flow is sometimes referred to as slug flow.
Procedure
1. Set Two-Phase Flow Low Limit to the lowest density value that is considered normal in
your process.
Values below this will cause the transmitter to post Alert A105 ().
Tip
Gas entrainment can cause your process density to drop temporarily. To reduce the
occurrence of two-phase flow alerts that are not significant to your process, set Two-Phase Flow
Low Limit slightly below your expected lowest process density.
You must enter Two-Phase Flow Low Limit in g/cm³, even if you configured another unit
for density measurement.
2. Set Two-Phase Flow High Limit to the highest density value that is considered normal in
your process.
Values above this will cause the transmitter to post Alert A105 (Two-Phase Flow).
Tip
To reduce the occurrence of two-phase flow alerts that are not significant to your process, set
Two-Phase Flow High Limit slightly above your expected highest process density.
You must enter Two-Phase Flow High Limit in g/cm³, even if you configured another
unit for density measurement.
3. Set Two-Phase Flow Timeout to the number of seconds that the transmitter will wait for
a two-phase flow condition to clear before posting the alert.
The default value for Two-Phase Flow Timeout is 0.0 seconds, meaning that the alert
will be posted immediately. The range is 0.0 to 60.0 seconds.
Configure process measurement
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