Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 105)

<1. Overview>
1-78
IM 11B08A01-01E
The settable upper limit values depending on the sample rate are shown in the following table.
Sample rate (ms) Main cycle upper limit (s)
40 5400 s
80 10800 s
160 21600 s
 Warming up time
Warming up time is time for displacement in sample streams.
The warming up time at shipment is shown in the following table.
When there is one SYS
within GCM
Half the time of the GCM method main cycle
When there are multiple
SYSs within GCM
Half the time of the shortest SYS method analysis cycle
among multiple SYSs
The settable lower limit values depending on the sample rate and the number of ovens are
shown in the following table.
Sample rate (ms) The number of ovens Warming up time (s)
40, 80, 160
1 30
2 60
3 120
The settable upper limit values depending on the sample rate are shown in the following table.
Sample rate (ms) Warming up time (s)
40 5400 s
80 10800 s
160 21600 s
 Stream valve ON/OFF time
Sample stream valve ON/OFF time.
Normally, turn on the stream valve one second after the warming up time. Therefore, set a
negative time for stream valve ON time.
Please note that when multiple SYSs are set for GCM and the time obtained by dividing GCM
main cycle by an integer of 2 to 8 is set for SYS analysis time, it is necessary to turn on the
stream valve until the sample valve ON/OFF operation for all SYSs, which were set for the GCM,
is performed.
The setting range is shown in the following table.
Stream valve ON time –(Warming up time – 1) to 0 s
Stream valve OFF time 0 to main cycle – 2 s
 Pause time
The time when the measurement is suspended in Pause mode.
Set a time to suspend each valve, and EPC program, which does not cause harmful effect on the
column system.
Normally, set a time between [SYS method peak detection stop time] × n and the main cycle – 2
s. (n: Integers of 1 to 8, division ratio of SYS analysis cycle and GCM main cycle)
The setting range is shown in the following table.
Pause time 5 to main cycle – 2 s
(3) SYS method
Method setting of 1 to 6 for each SYS is possible with users at Level C or higher.
SYS method number and GCM method number are in pairs.
2nd Edition : May 11, 2012-00