Emerson Micro Motion 9739 MVD Configuration And Use Manual page 84

Configure process measurement
2. Set the 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.
5.4.4 Configure Gas Standard Volume Flow Cutoff
Display Not available
ProLink II ProLink→Configuration→Flow→Std Gas Vol Flow Cutoff
Field Communicator Configure→Manual Setup→Measurements→Gas Standard Volume→GSV Cutoff
Gas Standard Volume Flow Cutoff specifies the lowest volume flow rate that will reported as measured. All
volume flow rates below this cutoff will be reported as 0.
Procedure
Set Volume Flow Cutoff to the desired value.
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.
Gas Standard Volume Flow Cutoff affects both gas standard volume flow values reported via outputs and
gas standard volume flow values used in other transmitter behavior (e.g., events defined on gas
standard volume flow).
AO Cutoff affects only flow values reported via the mA output.
t Example: Cutoff interaction with AO Cutoff lower than Gas Standard Volume Flow Cutoff
Configuration:
• mA Output Process Variable for the primary mA output: Gas Standard Volume Flow Rate
• Frequency Output Process Variable: Gas Standard Volume Flow Rate
• AO Cutoff for the primary mA output: 10 SLPM (standard liters per minute)
• Gas Standard Volume Flow Cutoff: 15 SLPM
Result: If the Gas Standard Volume flow rate drops below 15 SLPM, volume flow will be reported as
0, and 0 will be used in all internal processing.
78 Micro Motion 9739 MVD Transmitters