Detecting and reporting 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. By configuring the two-phase flow parameters appropriately for
your application, you can detect process conditions that require correction.
Tip
To decrease the occurrence of two-phase flow alerts, lower Two-Phase Flow Low Limit or raise Two-Phase
Flow High Limit.
A two-phase flow condition occurs whenever the measured density goes below Two-Phase
Flow Low Limit or above Two-Phase Flow High Limit. If this occurs:
• A two-phase flow alert is posted to the active alert log.
• Line density is held at its last pre‐alert value for the number of seconds configured in
Two-Phase Flow Timeout.
If the two-phase flow condition clears before Two-Phase Flow Timeout expires:
• Line density reverts to actual process density.
• The two-phase flow alert is deactivated, but remains in the active alert log until it is
acknowledged.
If the two-phase flow condition does not clear before Two-Phase Flow Timeout expires, line
density reverts to actual process density, but the two-phase flow alert remains active.
If Two-Phase Flow Timeout is set to 0.0 seconds, two-phase flow will cause a two-phase flow
alert but will have no effect on how the meter measures or reports line density.
4.3 Configure temperature measurement
The temperature measurement parameters control how temperature data from the
sensor is reported.
• Configure Temperature Measurement Unit (Section 4.3.1)
• Configure Temperature Damping (Section 4.3.2)
• Configure Temperature Input (Section 4.3.3)
4.3.1 Configure Temperature Measurement Unit
Display OFF-LINE MAINT > OFF-LINE CONFG > UNITS > TEMP
ProLink III Device Tools > Configuration > Process Measurement > Line Temperature > Temperature Unit
Field Communicator Configure > Manual Setup > Measurements > Temperature > Temperature Unit
Configure process measurement
Configuration and Use Manual 25
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