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3. Determine how the transmitter will obtain temperature data for the petroleum
measurement calculations, and perform the required setup.
Option Setup
Temperature data
from the sensor
a. Choose Online > Configure > Manual Setup > Measurements > External
Pressure/Temperature > Temperature.
b. Set External Temperature to Disabled.
A user-configured
static temperature
value
a. Choose Online > Configure > Manual Setup > Measurements > External
Pressure/Temperature > Temperature.
b. Set External Temperature to Enabled.
c. Set Correction Temperature to the value to be used.
Polling for tempera-
ture
(5)
a. Ensure that the primary mA output has been wired to support
HART polling.
b. Choose Online > Configure > Manual Setup > Measurements > External
Pressure/Temperature > Temperature.
c. Set External Temperature to Enabled.
d. Choose External Polling.
e. Set Poll Control to Poll As Primary or Poll as Secondary.
f. Determine whether you will use Polling Slot 1 or Polling Slot 2.
g. For the chosen slot, set Ext Dev Tag to the HART tag of the exter-
nal temperature device.
h. For the chosen slot, set Polled Variable to Temperature.
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.
A value written by
digital communica-
tions
a. Choose Online > Configure > Manual Setup > Measurements > External
Pressure/Temperature > Temperature.
b. Set External Temperature to Enabled.
c. Perform the necessary host programming and communications
setup to write temperature data to the transmitter at appropri-
ate intervals.
4.7.3 API reference tables
API reference tables, associated process fluids, and associated calculation valuesTable 4-11:
Table
name Process fluid CTL source data Reference temperature Density unit
5A Generalized crude and
JP4
Observed density and
observed temperature
60 °F (non-configurable) Degrees API
Range: 0 to 100
(5) Not available on all transmitters.
Configure process measurement
Configuration and Use Manual 51