Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 104)

<1. Overview>
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IM 11B08A01-01E
1.12.4 Method
(1) GCM and SYS
GC module concept has achieved parallel chromatography to perform simultaneous analysis
of multiple streams and has enabled optimal analysis condition by breaking the complicated
applications into simple column systems. This shortens the analysis time and achieves fl exible
equipment confi guration to meet customer needs.
Roles of GCM and SYS
GCM Gas Chromatograph Module
One GCM is equivalent to one virtual GC and assumes GC function of multiple units by
setting multiple GCMs to GC8000.
Two GCMs can be set at a maximum per isothermal oven.
Up to two GCMs can be set in one isothermal oven.
Up to four GCMs can be set in two isothermal ovens.
Up to six GCMs can be set in three isothermal ovens.
Setting for atmospheric pressure balancing valve number, stream valve number, stream
identifi cation output, and use of distillation point analyzer, and peak common setting
are performed for each GCM. Operation setting of stream valves is performed by GCM
method setting.
SYS System
SYS is the minimum analysis unit, and multiple SYSs can be set within GCM. This
shortens the analysis time for the important control elements among the element group
which is analyzed by GCM. The time obtained by dividing the main cycle of GCM
method by an integer of 1 to 8 can be set to the analysis cycle of SYS method.
[SYS method analysis cycle] = [GCM method main cycle] / n
n: Integers of 1 to 8, division ratio of SYS analysis cycle and GCM main cycle
Each SYS in the same GCM performs synchronous analysis.
Each SYS in different GCMs performs asynchronous analysis.
Two SYSs can be set at a maximum per isothermal oven.
Up to two SYSs can be set in one isothermal oven.
Up to four SYSs can be set in two isothermal ovens.
Up to six SYSs can be set in three isothermal ovens.
Perform setting of valve (RV or LSV), detector, and EPC for each SYS, and use SYS
method for each operation setting. Although the atmospheric pressure balancing valve
belongs to GCM, perform operation setting with SYS method. Perform the operation
setting of timing signal using DO, by means of SYS method.
(2) GCM method
Method setting of 1 to 6 for each GCM is possible with users at Level C or higher.
The items to be set for GCM method are described below. Refer to Chapter 5.4.20 to fi nd the
setting method.
 Main cycle
The time required from the start to the end of analysis.
The settable lower limit values depending on the sample rate and the number of ovens are
shown in the following table.
Sample rate (ms) Number of ovens Main cycle lower limit (s)
40, 80, 160
1 60
2 120
3 180
2nd Edition : May 11, 2012-00
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