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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/cm
³
, even if you configured another unit for density
measurement.
•
Default: 0 g/cm
³
•
Range: 0 g/cm
³
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/cm
³
, even if you configured another unit for density
measurement.
•
Default: 5 g/cm
³
•
Range: 5 g/cm
³
to the sensor limit
Configuration and Use Manual
Configure advanced options for process measurement
MMI-20048166
April 2019
Configuration and Use Manual
69
Содержание Micro Motion 4200
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