Set Base Compressibility only if you do not plan to set up compressibility measurement.
6. Choose the method to be used to supply temperature data, and perform the required setup.
Method Description Setup
Internal
temperature data
Temperature data from the on-
board temperature sensor
(RTD) will be used.
a. Choose Configure → Manual Setup → Measurements →
Optional Setup → Gas Measurement → Temperature.
b. Set External Temperature for Gas to Disable.
Polling The meter polls an external
device for temperature data.
a. Choose Configure → Manual Setup → Measurements →
Optional Setup → Gas Measurement → Temperature.
b. Set External Temperature for Gas to Enable.
c. Choose Configure → Manual Setup → Inputs/Outputs →
External Device Polling.
d. Choose an unused polling slot.
e. Set Poll Control to Poll as Primary or Poll as Secondary.
f. Set External Device Tag to the HART tag of the external
temperature device.
g. Set Polled Variable to Temperature.
Tip
A fixed temperature value is not recommended. Gas measurement is very sensitive to temperature,
and a fixed temperature value may produce inaccurate process data.
7. Set up the pressure input.
a) Choose Configure → Manual Setup → Inputs/Outputs → External Device Polling.
b) Choose an unused polling slot.
c) Set Poll Control to Poll as Primary or Poll as Secondary.
d) Set External Device Tag to the HART tag of the external pressure device.
e) Set Polled Variable to Pressure.
f) Choose Configure → Manual Setup → Measurements → Pressure.
g) Set Pressure Unit to the unit used by the external pressure device.
h) Optional: Choose Configure → Manual Setup → Measurements → Optional Setup → Gas
Measurement → Pressure.
i) Set Pressure Offset to the value required to adjust the pressure data for this meter.
Tip
A fixed pressure value is not recommended. Gas measurement is very sensitive to pressure, and a fixed
pressure value may produce inaccurate process data.
Configure process measurement using a field communicator Configuration and Use Manual
March 2021 MMI-20020954
70 Micro Motion Gas Specific Gravity Meters (SGM)
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