Configure Mass Flow Cutoff; Effect Of Flow Damping On Volume Measurement; Interaction Between Flow Damping And Ma Output Damping - Emerson Micro Motion 5700 Configuration And Use Manual

Configuration and Use Manual
MMI-20025166
• Default: 0.64 seconds
• Range: 0 seconds to 60 seconds
Note
If a number greater than 60 is entered, it is automatically changed to 60.
Tip
• A high damping value makes the process variable appear smoother because the reported value changes
slowly.
• A low damping value makes the process variable appear more erratic because the reported value changes
more quickly.
• The combination of a high damping value and rapid, large changes in flow rate can result in increased
measurement error.
• Whenever the damping value is non-zero, the reported measurement will lag the actual measurement
because the reported value is being averaged over time.
• In general, lower damping values are preferable because there is less chance of data loss, and less lag time
between the actual measurement and the reported value.
• The transmitter automatically rounds off any entered damping value to the nearest valid value. Therefore,
the recommended damping value for gas applications should be 3.2 seconds. If you enter 2.56, the
transmitter will round it off to 3.2.
• For filling applications, Micro Motion recommends using the default value of 0.04 seconds.

Effect of flow damping on volume measurement

Flow damping affects volume measurement for liquid volume data. Flow damping also affects volume
measurement for gas standard volume data. The transmitter calculates volume data from the damped mass
flow data.

Interaction between Flow Damping and mA Output Damping

In some circumstances, both Flow Damping and mA Output Damping are applied to the reported mass flow
value.
Flow Damping controls the rate of change in flow process variables. mA Output Damping controls the rate
of change reported via the mA Output. If mA Output Process Variable is set to Mass Flow Rate, and both
Flow Damping and mA Output Damping are set to non-zero values, flow damping is applied first, and the
added damping calculation is applied to the result of the first calculation.

4.2.3 Configure Mass Flow Cutoff

Display Menu > Configuration > Process Measurement > Flow Variables > Mass Flow Settings > Low Flow Cutoff
ProLink III Device Tools > Configuration > Process Measurement > Flow > Mass Flow Cutoff
Field Communicator Configure > Manual Setup > Measurements > Flow > Mass Flow Cutoff
Configuration and Use Manual
Configure process measurement
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