6 Configure advanced options for process
measurement
6.1 Detect and report two-phase flow
Two-phase flow (gas in a liquid process or liquid in a gas process) can cause a variety of process control issues.
The transmitter provides two methods to detect and report or respond to two-phase flow.
6.1.1 Detect two-phase flow using density
Display Menu > Configuration > Process Measurement > Density
ProLink III Device Tools > Configuration > Process Measurement > Density
Field Communicator Configure > Manual Setup > Measurements > Density > Slug Low Limit
Configure > Manual Setup > Measurements > Density > Slug High Limit
Configure > Manual Setup > Measurements > Density > Slug Duration
The transmitter can use line density data to detect two-phase flow (gas in a liquid process or liquid in a gas
process). The density limits are user-specified. When two-phase flow is detected, an alert is posted.
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 a Process Aberration alert.
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.
• Default: 0 g/cm³
• Range: 0 g/cm³ to the sensor limit
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 a Process Aberration alert.
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.
• Default: 5 g/cm³
• Range: 5 g/cm³ to the sensor limit
Configuration and Use Manual Configure advanced options for process measurement
MMI-20048166 April 2019
Configuration and Use Manual 69
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