5. Set Temperature Source to the method that the transmitter will use to obtain
temperature data.
Option Description
Poll for external value
The transmitter will poll an external temperature device, us-
ing HART protocol over the primary mA output.
RTD
The transmitter will use the temperature data from the sen-
sor.
Static or Digital Communications
The transmitter will use the temperature value that it reads
from memory.
• Static: The configured value is used.
• Digital Communications: An external host writes trans-
mitter data to transmitter memory.
The same location in memory is used for both options.
External temperature data is used only in petroleum measurement calculations. All
other transmitter calculations use temperature data from the sensor.
6.
If you chose RTD, no more configuration is required. Click Apply and exit.
7. If you chose to poll for temperature data:
a. Select the Polling Slot to use.
The transmitter has two polling slots. You can use one for temperature and the
other for pressure, if pressure compensation is enabled.
b. Set Polling Control to Poll as Primary or Poll as Secondary, and click Apply.
Tip
• Poll as Primary: No other HART masters will be on the network.
• Poll as Secondary: Other HART masters will be on the network. The Field Communicator
is not a HART master.
c. Set External Device Tag to the HART tag of the external temperature device, and
click Apply.
8.
If you chose to use a static temperature value, set External Temperature to the value to
use, and click Apply.
9. If you want to use digital communications, perform the necessary host
programming and communications setup to write temperature data to the
transmitter at appropriate intervals.
Note
If the Weights & Measures application is implemented and the transmitter is secured, digital
communications cannot be used to write temperature data to the transmitter.
Configure process measurement
Configuration and Use Manual 55
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