Gas measurement when the core process variable is specific gravity (continued)Table 2-3:
Process variable to be reported
Process data from the
meter
Process data from ex-
ternal devices User-specified values
Line density Temperature data from
meter (RTD)
(1)
Base density
Line compressibility
Base compressibility
External temperature
(2)
Line pressure
Base pressure
Base temperature
Line compressibility NX 19 Temperature data from
meter (RTD)
(1)
Specific gravity
External temperature
(2)
Line pressure
% CO2
% N2
Molecular weight of air
NX 19 Mod Temperature data from
meter (RTD)
(1)
Specific gravity
External temperature
(2)
Line pressure
% CO2
% N2
NX 19 3h 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 Specific gravity % CO
% CO2
% H2
% N2
Wobbe Index Specific gravity
Calorific value
Energy Flow Mass units Line density
(3)
Calorific value
Mass flow rate (exter-
nal or calculated)
Volume units Line density
(4)
Calorific value
Volume flow rate (ex-
ternal 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.
Orientation and planning
10 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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