The original volume flow rate value is divided by this conversion factor.
5. Set Volume Flow Label to the name you want to use for the volume flow unit. Maximum of 8 characters.
6. Set Volume Total Label to the name you want to use for the volume total and volume inventory unit.
Maximum of 8 characters.
The special measurement unit is stored in the transmitter. You can configure the transmitter to use the special
measurement unit at any time.
Example: Defining a special measurement unit for volume flow
To measure volume flow in pints per second (pints/sec):
1. Set Base Volume Unit to Gallons (gal).
2. Set Base Time Unit to Seconds (sec).
3. Calculate the conversion factor:
a. 1 gal/sec = 8 pints/sec
b. Volume Flow Conversion Factor = 1 ÷ 8 = 0.1250
4. Set Volume Flow Conversion Factor to 0.1250.
5. Set Volume Flow Label to pints/sec.
6. Set Volume Total Label to pints.
4.3.3 Configure Volume Flow Cutoff
Display
Menu → Configuration → Process Measurement → Flow Variables → Volume Flow Settings → Low
Flow Cutoff
ProLink III Device Tools → Configuration → Process Measurement → Flow → Volume Flow Cutoff
Field communicator Device Settings → Process Configuration → Volume Flow Rate → Volume Flow Rate Cutoff
Volume Flow Cutoff specifies the lowest volume flow rate that will be reported as measured. All volume flow
rates below this cutoff are reported as 0.
Procedure
Set Volume Flow Cutoff to the value you want to use.
• Default: 0.01/sec (liters per second)
• Range: 0 l/sec to x l/sec, where x is the sensor’s flow calibration factor, multiplied by 0.0002
• Recommendation: 0.5% of the sensor's maximum rated volumetric flow rate based on water.
Interaction between Volume Flow Cutoff and mAO Cutoff
Volume Flow Cutoff defines the lowest liquid volume flow value that the transmitter will report as measured.
mAO Cutoff defines the lowest flow rate that will be reported through mA Output. If mA Output Process
Variable is set to Volume Flow Rate, the volume flow rate reported through mA Output is controlled by the
higher of the two cutoff values.
Volume Flow Cutoff affects both the volume flow values reported via the outputs and the volume flow values
used in other transmitter behavior (e.g., events defined on the volume flow).
mAO Cutoff affects only flow values reported through mA Output.
Configuration and Use Manual Configure process measurement
MS-00809-0200-1600 May2024
Configuration and Use Manual 35
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