Detect And Report Two-Phase Flow; Detect Two-Phase Flow Using Density - Emerson Micro Motion 5700 Configuration And Use Manual

Configure advanced options for process measurement
Option
Service
6.2

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.
•
•
6.2.1

Detect two-phase flow using density

Display
ProLink III
Web browser
Overview
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.
2.
84
Description
Do not select unless directed by Micro Motion personnel.
Detect two‐phase flow using density
Detect two‐phase flow using sensor diagnostics
Menu > Configuration > Process Measurement > Density
Device Tools > Configuration > Process Measurement > Density
Configuration > Process Measurement > Density
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
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.
(Section 6.2.1)
(Section 6.2.2)
Micro Motion Model 5700 with Ethernet Transmitters