Table 2-2: Gas measurement when the primary process variable is specific gravity (continued)
Process variable to be reported Process data provided
by the SGM
Required process data
from external devices
Required user-
specified values
NX 19 3h
Sample temperature
data from meter
(RTD)
(1)
Specific gravity
Calorific value
External temperature
(2)
Line pressure
% CO2
% N2
Molecular weight of air
Base compressibility
NX 19 Specific gravity
% CO2
% N2
Molecular weight of air
Base temperature
Base pressure
NX 19 Mod Specific gravity
% CO2
% N2
Base temperature
Base pressure
NX 19 3h
Specific gravity
Calorific value
% CO2
% N2
Molecular weight of air
Base temperature
Base pressure
Calorific Value AGA-5 Specific gravity
% CO
% CO2
% H2
% N2
Wobbe Index
Specific gravity
Calorific value
Energy Flow
Mass units
Line density
(3)
Calorific value
Mass flow rate (external
or calculated)
Volume units
Line density
(4)
Calorific value
Volume flow rate
(external or calculated)
(1) Used when you want process variables to represent the gas in the measurement chamber.
(2) Used when you want process variables to represent the gas at the location of the temperature probe.
(3) Required only if you plan to use the calculated mass flow measurement unit as the measurement unit for energy flow.
(4) Required only if you plan to use the calculated volume flow measurement unit as the measurement unit for energy
flow.
Table 2-3: Gas measurement when the primary process variable is molecular weight
Process variable to be reported
Process data provided
by the SGM
Required process data
from external devices
Required user-
specified values
Molecular weight Molecular weight
Specific gravity Molecular weight Molecular weight of air
Base density
Molecular weight
Base compressibility
Base pressure
Base temperature
Orientation and planning Configuration and Use Manual
March 2021 MMI-20020954
16 Micro Motion Gas Specific Gravity Meters (SGM)
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