Prerequisites
If you plan to poll an external device, the primary mA Output (Channel A) must be wired to support HART
communications.
If you plan to use the mA Input for temperature data, Channel D must be available for use, and must be wired
to an external temperature device.
If you plan to use the mA Input for pressure data, Channel D must be available for use, and must be wired to
an external pressure device.
Restriction
You can use the mA Input for either external temperature or external pressure, but not both.
The pressure measurement must be gauge pressure, not atmospheric pressure.
The pressure device must use the pressure unit that is configured in the transmitter.
If you are using an external temperature device, it must use the temperature unit that is configured in the
transmitter.
Procedure
1. Choose the method to be used to supply temperature data, and perform the required setup.
Method Description Setup
Internal
temperature
Temperature data from the on-
board temperature sensor
(RTD) will be used for all
measurements and
calculations. No external
temperature data will be
available.
a. Choose Menu > Configuration > Process Measurement >
Temperature.
b. Set External Temperature to Off.
Polling The meter polls an external
device for temperature data.
This data will be available in
addition to the internal
temperature data.
a. Choose Menu > Configuration > Process Measurement >
Temperature.
b. Set External Temperature to On.
c. Choose Poll External Device.
d. Select Polled Variable 1 or Polled Variable 2.
e. Set Variable to External Temperature.
f. 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
network. The Field Communicator is
not a HART master.
g. Set External Device Tag to the HART tag of the external
temperature device.
Configuration and Use Manual Configure process measurement applications
MMI-20025166 March 2019
Configuration and Use Manual 55
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