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Option Description Setup
Polling The meter polls an external de-
vice for temperature data. This
data will be available in addi-
tion to the internal RTD tem-
perature data.
a. Set Line Temperature 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.
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 temperature
device.
e. Click Apply.
Digital communica-
tions
A host writes temperature data
to the meter at appropriate in-
tervals. This data will be availa-
ble in addition to the internal
RTD temperature data.
a. Set Line Temperature Source to Fixed Value or Digital Communica-
tions.
b. Click Apply.
c. Perform the necessary host programming and communica-
tions setup to write temperature data to the meter at appro-
priate intervals.
9. Verify that your temperature setup is being applied as intended.
a. Choose Device Tools > Configuration > I/O > Inputs > External Inputs.
b. Check or check the checkboxes as desired.
If a checkbox is checked, the internal RTD temperature is used for that
measurement or calculation. If a checkbox is unchecked, the external
temperature is used.
Postrequisites
If you are using external temperature data, verify the external temperature value displayed
in the Inputs group on the ProLink III main window .
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:
- Verify that the host has access to the required data.
- Verify that the host is writing to the correct register in memory, using the correct data
type.
Configure process measurement
48 Micro Motion
®
Fork Viscosity Meters (FVM)