Method Description Setup
Polling The meter polls an external de-
vice for volume flow rate data.
a. Choose Configure > Manual Setup > Inputs/Outputs > External Device
Polling.
b. Choose an unused polling slot.
c. Set Poll Control to Poll as Primary or Poll as Secondary.
Option Description
Poll as Primary No other HART masters will be on the
network. The Field Communicator is not
a HART master.
Poll as Secondary Other HART masters will be on the net-
work. The Field Communicator is not a
HART master.
d. Set External Device Tag to the HART tag of the external pres-
sure device.
e. Set Polled Variable to Volume from Mag/Vortex Meter.
Digital communica-
tions
A host writes volume flow rate
data to the meter at appropri-
ate intervals.
a. Perform the necessary host programming and communica-
tions setup to write volume flow rate data to the transmitter
at appropriate 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
Choose Service Tools > Variables > External Variables and verify the values for External Volume
Flow Rate and Mass Flow Rate (Calculated).
Need help? If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
- Verify the wiring between the meter and the external device.
- Verify the HART tag of the external device.
• For digital communications:
Configure process measurement
Configuration and Use Manual 65
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