Specific gravity calculated from molecular weight Equation 2-4:
SG =
MW
Gas
MW
Air
SG
Specific gravity of process gas
MW
Gas
Molecular weight of process gas (g/mol)
MW
Air
Molecular weight of air (user-specified; default = 28.96469 g/mol)
Core process variable = Relative density
The following equation is used when the core process variable is relative density.
Relative density Equation 2-5:
RD = K0 + K1 × + K2 ×
2
RD
Relative density of process gas
K0, K1, K2
Calibration factors from the on-site calibration. If a two-point calibration was
performed, K1 is set to 0.
τ
Sensor time period (microseconds)
Orientation and planning
14 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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