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Procedure
1. Choose Device Tools > Configuration > I/O > Inputs > External Inputs.
2. Set Mass Flow (Calculated) to Enabled and click Apply.
3. Set Mass Flow Rate (Calculated) Unit to the unit in which the mass flow rate will be
reported.
4. Set Line Volume Flow Rate Unit to the units used by the external volume measurement
device
5. Set Line Volume Flow Source to the method to be used to retrieve volume flow data
and perform the required setup.
Option Description Setup
Polling The meter polls an external de-
vice for volume flow data and
calculates the equivalent mass
flow rate.
a. Set Line Volume Flow Source to Poll for External Value.
b. Set Polling Slot to an available slot.
c. Set Polling Control to Poll as Primary or Poll as Secondary.
d. Set External Device Tag to the HART tag of the volume flow
measurement device.
Digital communica-
tions
A host writes volume flow data
to the meter at appropriate in-
tervals, and the meter calcu-
lates the equivalent mass flow
rate.
a. Set Line Volume Flow Source to Fixed Value or Digital Communica-
tions.
b. Perform the necessary host programming and communica-
tions setup to write volume flow data to the meter at appro-
priate intervals.
Tip
A fixed value is not recommended. A fixed value may produce inaccurate process data.
The following process variables are now available:
• Line Volume Flow Rate
• Mass Flow Rate (Calculated)
If the concentration measurement application is enabled and configuration requirements
are met, one of the following process variables is also available:
• Net Volume Flow Rate
• Net Mass Flow Rate
Postrequisites
To verify the volume flow rate, view the value displayed on the ProLink III main window, in
the Inputs group.
To verify the calculated mass flow rate, set up one of the ProLink III gauges to display it.
Need help? If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
Configure process measurement
Configuration and Use Manual 83