Filter
Top Products
Performance Optimisation 3098 Technical Manual
A-10
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.
YX
Y
y
X
x
C
c
X
x
xC X'()=+
−
§
©
¨
·
¹
¸
−
§
©
¨
·
¹
¸
−
For gases A or B, substitute 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 the example:
Yx'.
.
.
.
.
.
.
.
.
(. . )=+
−
§
©
¨
·
¹
¸
−
§
©
¨
·
¹
¸
−07171
125
0 985
07171
0 9816
08624
09775
0 7171
0 9816
08624 07171
= 1.2328
*
*
*
*
*
1.25
True Base Density (ρ
s
true)
Fig. A1 Illustration of Example Condition
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