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Restriction
The high and low limit alarms require the enhanced core processor.
Example: If Extrapolation Alarm Limit is set to 5%, High Extrapolation Limit (Temperature) is
enabled, and the matrix is built for a temperature range of 40 °F to 80 °F, an
extrapolation alarm will be posted if process temperature goes above 82 °F
8. 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: A host writes transmitter data
to transmitter memory.
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.
9. If you chose RTD, no more configuration is required. Click Apply and exit.
10. If you chose to poll for temperature data:
a. Select the Polling Slot to use.
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.
11.
If you chose to use a static temperature value, set External Temperature to the value to
use, and click Apply.
12. If you want to use digital communications, click Apply, then perform the necessary
host programming and communications setup to write temperature data to the
transmitter at appropriate intervals.
Configure process measurement
Configuration and Use Manual 63