Overview
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.
The default value for Mass Flow Cutoff is 0.0 g/sec or a sensor-specific value set at the
factory. The recommended value is 0.5% of the nominal flow rate of the attached sensor.
See the sensor specifications. Leaving Mass Flow Cutoff at 0.0 g/sec is not recommended.
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 via the mA
output. If mA Output Process Variable is set to
Mass Flow Rate
, the mass flow rate reported
via the 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 via the mA Output.
Example: Cutoff interaction with mA Output Cutoff lower than Mass Flow Cutoff
Configuration:
•
mA Output Process Variable:
Mass Flow Rate
•
Frequency Output Process Variable:
Mass Flow Rate
•
mA Output Cutoff:
10
g/sec
•
Mass Flow Cutoff:
15
g/sec
Result: If the mass flow rate drops below 15 g/sec, mass flow will be reported as 0, and 0
will be used in all internal processing.
Example: Cutoff interaction with mA Output Cutoff higher than Mass Flow Cutoff
Configuration:
•
mA Output Process Variable:
Mass Flow Rate
•
Frequency Output Process Variable:
Mass Flow Rate
•
mA Output Cutoff:
15
g/sec
Configure process measurement
Configuration and Use Manual
21
Summary of Contents for Micro Motion 2500
Page 8: ...Contents vi Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 10: ...Getting started 2 Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 18: ...Quick start 10 Micro Motion Model 2500 Transmitters with Configurable Input Outputs ...
Page 237: ...NE 53 history Configuration and Use Manual 229 ...
