Configure Density Damping - Emerson Micro Motion 2700 Configuration And Use Manual

3.
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.
Micro Motion recommends leaving Two-Phase Flow High Limit at the default value.
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:
•
•
If the two-phase flow condition clears before Two-Phase Flow Timeout expires:
•
•
If the two-phase flow condition does not clear before Two-Phase Flow Timeout expires, the
outputs that represent flow rate report a flow rate of 0.
If Two-Phase Flow Timeout is set to 0.0 seconds, the outputs that represent flow rate will
report a flow rate of 0 as soon as two-phase flow is detected.
4.5.3

Configure Density Damping

Display
ProLink III
Field Communicator Configure > Manual Setup > Measurements > Density > Density Damping
Fieldbus host
Overview
Density Damping controls the amount of damping that will be applied to the line density
value.
Configuration and Use Manual
You must enter Two-Phase Flow High Limit in g/cm³, even if you configured another
unit for density measurement.
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.
The Two-Phase Flow alert is set immediately. The flow rate will hold the last
measured value for the Timeout time. Then the flow rate will report zero flow. If the
density goes back in range, the error clears immediately.
A two-phase flow alert is posted to the active alert log.
All outputs that are configured to represent flow rate hold their last pre‐alert value
for the number of seconds configured in Two-Phase Flow Timeout.
Outputs that represent flow rate revert to reporting actual flow.
The two-phase flow alert is deactivated, but remains in the active alert log until it is
acknowledged.
Not available
Device Tools > Configuration > Process Measurement > Density
Measurement TB > DENSITY_DAMPING (OD Index 34)
Configure process measurement
35