The default value is 0. The range is 0.7 to 1.1.
b. Set Base Compressibility to the compressibility of your sample gas at base
temperature and base pressure.
The default value is 1.0. The range is 0.7 to 1.1.
c. Click Apply. No further actions are required.
4. If you set Compressibility Calculations to Enabled, complete the configuration as
described in the following steps.
5. Select the compressibility measurement method that you want to use or that meets
site standards.
Important
• Different options are available depending on your core process variable: specific gravity,
molecular weight, or relative density.
• If you choose AGA NX 19 Mod 3 or SGERG 88, you must set up energy content
measurement. If you choose any other method, energy content measurement is required
only if you want the meter to report calorific value, Wobbe index, or energy flow.
• Each compressibility measurement method has associated process limits. If your process
goes outside the valid range, compressibility will be reported as NaN (Not a Number), and
all process variables that require a calculated compressibility value will also be reported as
NaN.
6. Set % CO2 Source to the method you will use to supply % CO2 data, and perform the
required setup.
Option
Description Setup
Polling The meter polls an external de-
vice for % CO2 data.
a. Set % CO2 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 % CO2 meas-
urement device.
Digital communica-
tions
A host writes % CO2 data to the
meter at appropriate intervals.
a. Set % CO2 Source to Fixed Value or Digital Communications.
b. Perform the necessary host programming and communica-
tions setup to write % CO2 data to the meter at appropriate
intervals.
Fixed value The configured fixed value is
used.
a. Set % CO2 Source to Fixed Value or Digital Communications.
b. Set % CO2 (Fixed) to the desired value, in % by volume.
7. Set % N2 Source to the method you will use to supply % N2 data, and perform the
required setup.
Configure process measurement using ProLink III
Configuration and Use Manual 59
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