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6. Determine how the transmitter will obtain pressure data, and perform the required
setup.
Option Setup
A user-configured
static pressure val-
ue
a. Set Pressure Units to the desired unit.
b. Set External Pressure to the desired value.
Polling for pres-
sure
(4)
a. Ensure that the primary mA output has been wired to support
HART polling.
b. Choose ProLink > Configuration > Polled Variables.
c. Choose an unused polling slot.
d. Set Polling Control to Poll As Primary or Poll as Secondary, and click
Apply.
e. Set External Tag to the HART tag of the external pressure device.
f. Set Variable Type to Pressure.
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. Set Pressure Units to the desired unit.
b. Perform the necessary host programming and communications
setup to write pressure data to the transmitter at appropriate in-
tervals.
Postrequisites
If you are using an external pressure value, verify the setup by choosing ProLink > Process
Variables and checking the value displayed in External Pressure.
4.7.2 Configure pressure compensation using ProLink III
Prerequisites
You will need the flow factor, density factor, and calibration pressure values for your
sensor.
• For the flow factor and density factor, see the product data sheet for your sensor.
• For the calibration pressure, see the calibration sheet for your sensor. If the data is
unavailable, use 20 PSI.
Procedure
1. Choose Device Tools > Configuration > Process Measurement > Pressure Compensation.
2. Set Pressure Compensation Status to Enabled.
3. Enter Flow Calibration Pressure for your sensor.
(4) Not available on all transmitters.
Configure process measurement
Configuration and Use Manual 53