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Installation and Configuration Manual 59
Performance Optimization
Principles of Operation Certified System DrawingsReturn PolicyPerformance Optimization
Alternative simplified method of deriving modified values of Y (the nitrogen SG value used for
calibration) to produce a nil error condition for a Methane/Gas C (or Gas B or Gas A) calibration.
Figure A-1 Illustration of example condition
For gases A or B, substute for C and C in this
equation, where:
• X,Y, C = true base densities of the gases
• x, y, c = total factors E
F
For example:
Y
""
X
Y
y
----
X
x
----–
⎝⎠
⎛⎞
C
c
----
X
x
----–
⎝⎠
⎛⎞
--------------------
CX–()×+=
Y
""
0.7171
1.25
0.985
---------------
0.7171
0.9816
------------------–
⎝⎠
⎛⎞
0.8624
0.9775
------------------
0.7171
0.9816
------------------–
⎝⎠
⎛⎞
------------------------------------------------+ 0.8624 0.7171–()× 1.2328==
*
*
*
*
*
1.25
True Base Density (ρ
s
true)
Indicated Base Density (
ρ
s
ind)
Nitrogen (N
2
)
(Z
F
xV
F
=1)
Methane (C
1
)
A B C
For methane/nitrogen gas calibration
using ρ
s
ind nitrogen of 1.235
For methane/nitrogen gas calibration
using ρ
s
ind nitrogen of 1.235