4.4 Configure the pressure input
Pressure data is required for several different measurements. The meter does not measure
pressure. There are several different methods to obtain pressure data.
• Configure the pressure input using ProLink III (Section 4.4.1)
• Configure the pressure input using the Field Communicator (Section 4.4.2)
4.4.1 Configure the pressure input using ProLink III
ProLink III Device Tools > Configuration > Process Measurement > Line Pressure
Overview
Pressure data is required for several different measurements. There are several different
methods to obtain pressure data.
Tip
A fixed pressure value is not recommended. A fixed pressure value may produce inaccurate process
data.
Procedure
1. Choose Device Tools > Configuration > Process Measurement > Line Pressure.
2. Set Pressure Unit to the unit used by the external pressure device.
Restriction
If the API referral application is enabled, the API table selection automatically sets the
pressure measurement unit. Configure the API referral application first, then change the
pressure measurement unit if necessary.
3. Choose the method you will use to supply pressure data, and perform the required
setup.
Option Description Setup
Polling The meter polls an external de-
vice for pressure data.
a. Set Line Pressure 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.
d. Set External Device Tag to the HART tag of the temperature
device.
Digital communica-
tions
A host writes pressure data to
the meter at appropriate inter-
vals.
a. Set Line Pressure Source to Fixed Value or Digital Communications.
b. Perform the necessary host programming and communica-
tions setup to write pressure data to the meter at appropri-
ate intervals.
Configure process measurement
Configuration and Use Manual 31
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