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Option Description Setup
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.
6. 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.
• If necessary, apply an offset.
Configure referred viscosity measurement, ASTM D341
Single-Curve method, using the Field Communicator
Field Communicator Configure > Manual Setup > Measurements > Optional Setup > Referred Viscosity
Overview
Referred viscosity is line viscosity corrected to a reference temperature. In other words, this
is the viscosity that the device would report if the line temperature matched the reference
temperature. The ASTM D341 single-curve method is used only with petroleum products.
It is used when the meter will measure only one process fluid.
Configure process measurement
38 Micro Motion
®
Fork Viscosity Meters (FVM)