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)
Molecular weight calculated from specific gravity
MW
Gas
= SG
Gas
× MW
Air
MW
Gas
Molecular weight of process gas (g/mol)
SG
Specific gravity of process gas
MW
Air
Molecular weight of air (user-specified; default = 28.96469 g/mol)
2.4.2 Primary process variable = molecular weight
The following equations are used when the primary process variable is molecular weight.
Molecular weight
MW = K0 + K1 × τ + K2 × τ
2
MW
Molecular weight 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)
Specific gravity calculated from molecular weight
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)
2.4.3 Primary process variable = relative density
The following equation is used when the primary process variable is relative density.
Relative density
RD = K0 + K1 × τ + K2 × τ
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)
Configuration and Use Manual Orientation and planning
MMI-20020954 March 2021
Configuration and Use Manual 19
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