Important
Line pressure data is used in several different measurements and calculations. The transmitter stores
only one pressure value, which may be either the external pressure or the configured fixed value.
Accordingly, if you choose a fixed pressure for some uses, and an external pressure for others, the
external pressure will overwrite the fixed value.
Prerequisites
If you plan to poll an external device, the primary mA output must be wired to support
HART communications.
You must be using gauge 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 Device Tools > Configuration > Process Measurement > API Referral.
2. 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.
Configure process measurement
38 Micro Motion
®
Fork Density Meters (FDM)
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