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 through 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 Device Settings → Process Configuration → Mass Flow Rate → Mass Flow Cutoff
Mass Flow Cutoff specifies the lowest mass flow rate that will be reported as measured. All mass flow rates
below this cutoff will be reported as 0.
Procedure
Set Mass Flow Cutoff to the value you want to use.
• Default: A sensor-specific value set at the factory. If your transmitter was ordered without a sensor, the
default may be 0.0.
• Recommendation: 0.5% of maximum flow rate of the attached sensor. See the sensor specifications.
Important
Do not use your meter for measurement with Mass Flow Cutoff set to 0.0 g/sec. Ensure that Mass Flow Cutoff
is set to a nonzero value that is appropriate for your sensor and process conditions.
Effect of Mass Flow Cutoff on volume measurement
Mass Flow Cutoff does not affect volume measurement. Volume data is calculated from the actual mass data
rather than the reported value.
Volume flow has a separate Volume Flow Cutoff that is not affected by the Mass Flow Cutoff value.
Interaction between Mass Flow Cutoff and mA Output Cutoff
Mass Flow Cutoff defines the lowest mass flow value that the transmitter will report as measured.
mA Output Cutoff defines the lowest flow rate that will be reported through mA Output. If mA Output Process
Variable is set to Mass Flow Rate, the mass flow rate reported through mA Output is controlled by the higher
of the two cutoff values.
Mass Flow Cutoff affects all reported values and values used in other transmitter behavior (e.g., events
defined on mass flow).
mA Output Cutoff affects only mass flow values reported through mA Output.
Configuration and Use Manual Configure process measurement
MS-00809-0200-1600 May2024
Configuration and Use Manual 31
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