Emerson Micro Motion SGM Series Configuration And Use Manual page 20

Orientation and planning
Table 2-4: Gas measurement when the core process variable is molecular weight
Process variable to be reported
Calorific Value
Wobbe Index
Energy Flow Mass units
Volume units
(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.
Table 2-5: Gas measurement when the core process variable is relative density
Process variable to be reported
Relative density
Base density
Line density
Line compressibility
Base compressibility
(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.
12
Process data from the Process data from ex-
meter ternal devices
Line density % CO
Specific gravity % CO2
% H2
% N2
Specific gravity
Calorific value
Line density Mass flow rate (direct
input or calculated)
Calorific value
Calorific value Volume flow rate (di-
rect input or calcula-
ted)
Process data from the Process data from ex-
meter ternal devices
Relative density
Relative density
Temperature data from External temperature
(1)
meter (RTD)
Line pressure
Base density
Line compressibility
Base compressibility
Temperature data from External temperature
(1)
meter (RTD)
Line pressure
Relative density
% CO2
% H2
% N2
Relative density % CO2
% H2
% N2
Micro Motion
(continued)
User-specified values
User-specified values
Base density of air
(2)
Base temperature
Base pressure
(2)
Base temperature
Base pressure
®
Gas Specific Gravity Meters (SGM)