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Method 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. Choose Configure > Manual Setup > Measurements > Optional Setup
> External Inputs > Temperature.
b. Set External Temperature for Viscosity to Enable.
c. Choose Configure > Manual Setup > Inputs/Outputs > External Device
Polling.
d. Choose an unused polling slot.
e. 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.
f. Set External Device Tag to the HART tag of the external tem-
perature device.
g. Set Polled Variable to Temperature.
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. Choose Configure > Manual Setup > Measurements > Optional Setup
> External Inputs > Temperature.
b. Set External Temperature for Viscosity to Enable.
c. Perform the necessary host programming and communica-
tions setup to write temperature data to the meter at appro-
priate intervals.
Postrequisites
To view the current external temperature value, choose Service Tools > Variables > External
Variables. Verify that the value is correct.
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.
• If necessary, apply an offset.
Configure process measurement
Configuration and Use Manual 77