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Example: Defining a special measurement unit for gas standard volume flow
You want to measure gas standard volume flow in thousands of standard cubic feet per
minute.
1. Set Base Gas Standard Volume Unit to SCFM.
2. Set Base Time Unit to minutes (min).
3. Calculate the conversion factor:
a. 1 thousands of standard cubic feet per minute = 1000 cubic feet per minute
b. Gas Standard Volume Flow Conversion Factor = 1/1000 = 0.001
4. Set Gas Standard Volume Flow Conversion Factor to 0.001.
5. Set Gas Standard Volume Flow Label to KSCFM.
6. Set Gas Standard Volume Total Label to KSCF.
4.3.4 Configure Gas Standard Volume Flow Cutoff
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Offline Maintain > Configuration > Low Flow Cutoff > Gas Vol Flow Cutoff
ProLink II ProLink > Configuration > Flow > Std Gas Vol Flow Cutoff
ProLink III Device Tools > Configuration > Process Measurement > Flow
Field Communicator Configure > Manual Setup > Measurements > GSV > GSV Cutoff
Overview
Gas Standard Volume Flow Cutoff specifies the lowest gas standard volume flow rate that will
reported as measured. All gas standard volume flow rates below this cutoff will be
reported as 0.
Procedure
Set Gas Standard Volume Flow Cutoff to the value you want to use.
The default value for Gas Standard Volume Flow Cutoff is 0.0. The lower limit is 0.0. There is no
upper limit.
Interaction between Gas Standard Volume Flow Cutoff and AO
Cutoff
Gas Standard Volume Flow Cutoff defines the lowest Gas Standard Volume flow value that the
transmitter will report as measured. AO Cutoff defines the lowest flow rate that will be
reported via the mA output. If mA Output Process Variable is set to Gas Standard Volume Flow
Rate, the volume flow rate reported via the mA output is controlled by the higher of the
two cutoff values.
Configure process measurement
Configuration and Use Manual 37