Option Description Setup
Polling The meter polls an external
device for temperature data.
This data will be available in
addition to the internal RTD
temperature data.
a. Set Sample 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. A field communicator is not
a HART master.
Poll as Secondary Other HART masters will be on the
network. A field communicator is not
a HART master.
d. Set External Device Tag to the HART tag of the
temperature device.
e. Select Apply.
Digital
communications
A host writes temperature data
to the meter at appropriate
intervals. This data will be
available in addition to the
internal RTD temperature data.
a. Set Sample Temperature Source to Fixed Value or Digital
Communications.
b. Select Apply.
c. Perform the necessary host programming and
communications setup to write temperature data to the
meter at appropriate intervals.
2. If you set up an external temperature:
a) Choose Device Tools → Configuration → I/O → Inputs → External Inputs.
b) In the Sample 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:
— 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.
Configure process measurement using ProLink III Configuration and Use Manual
March 2021 MMI-20020954
50 Micro Motion Gas Specific Gravity Meters (SGM)
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