Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 487)

App.E-14
IM 11B08A01-01E
The computation formula is:
c
j
= c
total
– c
i
k
i=1
∑
Where:
c
i
: concentration of peak i
c
j
: concentration of deviation component j
c
total
: total of the concentration values
(4) Additional Computation Processes
There are linear computation, ratio computation, resolution computation, Divisor computation,
and calorifi c value computation functions.
The computation fl ow is as shown below.
Linear
computation
Ratio
computation
Concentration value
Computed value
Computed value
Divisor
computation
Computed value
Calorific
computation
Computed value
Resolution
computation
Computed value
F020504.ai
Peak half-width
retention time
 Linear Computation
Linear computation multiplies each obtained concentration (including deviation concentration
values) by the coeffi cient and calculates the total of the results.
Linear computation is available for the concentrations of a stream where the computation is
predefi ned.
Since fi ve coeffi cients can be set for each concentration, fi ve sets of computation formulas can
be set for each stream.
The computation formula is:
x
j
= a
j
a
ij
c
i
+b
j
k
i=1
∑
Where:
x
j
: result of the linear computation
c
i
: concentration of peak i
a
ij
: coefficient of linear computation j of peak i
a
j
: coefficient a of computation j
b
j
: coefficient b of computation j
 Ratio Computation.
Ratio computation computes the ratio of two obtained concentrations.
Every time the concentration of the numerator X
k
is computed, the computation is updated.
2nd Edition : May 11, 2012-00