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Tip
To decrease the occurrence of slug flow alarms, lower Slug Low Limit or raise Slug High Limit.
A slug flow condition occurs whenever the measured density goes below Slug Low Limit or
above Slug High Limit. If this occurs:
• A slug flow alarm is posted to the active alarm log.
• All outputs that are configured to represent flow rate hold their last “pre-slug flow”
value for the configured Slug Duration.
If the slug flow condition clears before Slug Duration expires:
• Outputs that represent flow rate revert to reporting actual flow.
• The slug flow alarm is deactivated, but remains in the active alarm log until it is
acknowledged.
If the slug flow condition does not clear before Slug Duration expires, the outputs that
represent flow rate report a flow rate of 0.
If Slug Duration is set to 0.0 seconds, the outputs that represent flow rate will report a flow
rate of 0 as soon as slug flow is detected.
4.5.3 Configure Density Damping
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Offline Maintain > Configuration > Damping > Density Damping
ProLink II ProLink > Configuration > Density > Density Damping
ProLink III Device Tools > Configuration > Process Measurement > Density
Field Communicator Configure > Manual Setup > Measurements > Density > Density Damping
Overview
Damping is used to smooth out small, rapid fluctuations in process measurement. Damping
Value specifies the time period (in seconds) over which the transmitter will spread changes
in the reported process variable. At the end of the interval, the reported process variable
will reflect 63% of the change in the actual measured value.
Procedure
Set Density Damping to the value you want to use.
The default value is 1.6 seconds. The range depends on the core processor type and the
setting of Update Rate, as shown in the following table:
Core processor type Update Rate setting Density Damping range
Standard Normal 0 to 51.2 seconds
Special 0 to 10.24 seconds
Configure process measurement
Configuration and Use Manual 47