Procedure
1. Choose the method to be used to supply temperature data, and perform the
required setup.
Option Description Setup
Internal RTD tem-
perature data
Temperature data from the on-
board temperature sensor
(RTD) is used.
a. Set Line Temperature Source to Internal RTD.
b. Click Apply.
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 Communi-
cations.
b. Click Apply.
c. Perform the necessary host programming and communica-
tions setup to write temperature data to the meter at appro-
priate intervals.
2. If you set up an external temperature:
a. Choose Device Tools > Configuration > I/O > Inputs > External Inputs.
b. In the Line Temperature Input group, check or uncheck the checkboxes as
desired.
If a checkbox is checked, the internal 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:
• For polling:
Configure process measurement using ProLink III
Configuration and Use Manual 55
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