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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Calibration 195
Third-order polynomial
If the third-order polynomial wet calibration method is selected, then the wet-calibration gas
flow velocity is calculated as shown in Equation 6-11.
Equation 6-11 Wet calibration - third-order polynomial
where
Note that the meter provides two sets of wet calibration polynomial coefficients - one set for
each flow direction.
No wet calibration
If no wet calibration is selected, then the wet calibration gas flow velocity is equal to the dry
calibration gas flow velocity.
=
wet-calibration gas flow velocity (m/s) (AvgFlow)
=
dry-calibration gas flow velocity (m/s) (DryCalVel)
=
wet-calibration 0
th
order coefficient (m/s) (FwdC0 or
RevC0)
=
wet-calibration 1
st
order coefficient (dimensionless) (FwdC1
or RevC1)
=
wet-calibration 2
nd
order coefficient (s/m) (FwdC2 or
RevC2)
=
wet-calibration 3
rd
order coefficient (s
2
/m
2
) (FwdC3 or
RevC3)
V
WetCal
C
0
C
1
V+
DryCal
C
2
V
DryCal
2
C
3
V
DryCal
3
++=
V
WetCal
V
DryCal
C
0
C
1
C
2
C
3