Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 106)

<1. Overview>
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IM 11B08A01-01E
The items to be set for SYS method are described below. Refer to Chapter 5.4.21 to fi nd the
setting method.
 Analysis cycle
The time required from the start to the end of SYS analysis.
[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
 Peak detection stop time
The time when peak detection of chromatogram is completed. Set a time after all the peaks to be
analyzed in SYS have been eluted.
The setting range is shown in the following table.
Peak detection stop time 5 s to analysis cycle
 Tracking specifi cation and automatic renewal of tracking factors
Perform setting for whether to execute tracking (correction) of gate time setting to be used for
peak detection and whether to automatically update tracking factors.
 Valve ON/OFF time
Set the ON/OFF time of the valve, which is set for SYS in advance, by using “SYS setting” (RV or
LSV for sample valve, backfl ushing valve, and column switching valve). ON time and OFF time
can be set three times per cycle of SYS method, respectively.
The setting range is shown in the following table.
Valve ON time 0 to analysis cycle – 2 s
Valve OFF time ON time + 1 s to analysis cycle – 2 s
* Make sure to set the 2nd time after 1st time, 3rd time after 2nd time.
* Set ON time and OFF time for each cycle in pairs with an interval of 1 s or more.
 Atmospheric pressure balancing valve ON/OFF time
Set the ON/OFF time of the atmospheric pressure balancing valve for the gas sample.
There is a case when the atmospheric pressure balancing valve is used for collecting gas sample
depending on the specifi cation. Because the compressibility of the gas sample changes along
with the change in fl ow rate, sample collection quantity changes. To prevent this change, use the
atmospheric pressure balancing valve.
Specifi cally, stop the fl ow of gas sample by turning on the atmospheric pressure balancing valve,
which was set before the sample valve measuring pipe, and turn on the sample valve. Collect
the sample by turning on the sample valve when the pressure within the sample valve measuring
pipe is in equilibrium with the outlet atmospheric pressure. These operations are executed by
setting each valve at SYS method setting.
Perform setting for whether to install atmospheric pressure balancing valve per Oven# at
“Atmospheric pressure balancing valve setting” and set atmospheric pressure balancing valve
number to be used on each GCM at “GCM setting.” In this way, set the ON/OFF time of the
atmospheric pressure balancing valve, which was set to GCM to which the SYS belongs, in
advance with “SYS method.” ON time and OFF time can be set three times per cycle of SYS
method, respectively.
Please note that when multiple SYSs are set to GCM, perform setting of ON/OFF operation of
atmospheric pressure balancing valve that was set to GCM (mechanically one for one GCM)
from the SYS method of each SYS which was set to the GCM.
2nd Edition : May 11, 2012-00
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