Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 486)

<Appendix E Computation Scheme>
App.E-13
IM 11B08A01-01E
The computation formula is:
c
i
=
(f
j
s
j
)
f
i
s
i
k
j=l
∑
Where:
c
i
: concentration of peak i
s
i
: area of peak i
f
i
: sensitivity correction coefficient of peak i
(f) Total Compensation
Total compensation computes the concentration measured in a stream so that the total value of
the measurement components is the total value specifi ed in each stream.
The computation formula is:
c
ni
= c
total
c
j
c
i
k
j=l
∑
Where:
c
ni
: result of total compensation for peak i (excluding the concentrations
of the “Total compensation disable” peaks)
c
ni
: concentration of peak i
c
total
: total of the concentration values
(g) Variation Coeffi cient Computation
Variation coeffi cient computation computes the variation coeffi cient for concentration.
The computation formula is:
c
avrg
=
n
c
i
∑
c
v
=
1
c
span
(c
i
–c
avrg
) 2
n
∑
Where:
c
i
: concentration of peak i
c
span
: measurement span of peak i
c
v
: variation coefficient of concentration for peak i
(3) Deviation Component Computation
Deviation component computation computes the difference between the concentration values
measured in a stream and the total concentration specifi ed for each stream.
Deviation coeffi cient computation can be made for obtained concentration values. See the
section on variation coeffi cient computation in peak processing.
If the result of a computation is negative, the result is counted as 0.
2nd Edition : May 11, 2012-00
App.E