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304 Metrology - calibration equation parameters
Upgrading a Mark II to a Mark III Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
C.4.2 Metrology - calibration equation parameters
The Mark III calibration calculations are slightly different than those of the Mark II. The purpose
of this section is to illustrate the differences and show how the Mark II calibration values are
converted for use in the Mark III to achieve the same results.
Mark II Calibration
The Mark II calibration is comprised of three basic steps:
1. application of the “British Gas” (BG) Factor (see Equation C-1)
2. application of either the “A” polynomial coefficients (see Equation C-2) or the
(Velocity Offset, Meter Factor) parameters (see Equation C-3)
3. application of the 10-point linearization (optional)
Equation C-1 Mark II Application of the British Gas Factor
Equation C-2 Mark II Application of the “A” Polynomial Coefficients
Equation C-3 Mark II Application of the [VelOffset, MeterFactor]
v
BG
BG v
AvgWtd
⋅=
v
DryCal
A
0
A
1
v+
BG
A
2
v
BG
2
A
3
v
BG
3
++=
A
0
A
1
BG v
AvgWtd
⋅⋅()A
2
BG
2
v
AvgWtd
2
⋅⋅()A
3
BG
3
v
AvgWtd
3
⋅⋅()++ +()=
v
DryCal
v
BG
VelOffset–()MeterFactor⋅=
v
AvgWtd
BG⋅()VelOffset–()MeterFactor⋅=