Yokogawa GC1000 Mark II Process Gas Chromatograph - Manual (Page 42)

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IM 11B03A03-01E
4.3 Method
Activation timing for various valves and parameters with regard to the temperature of the
isothermal/programmed-temperature ovens should be specified for Method. Four Methods
can be used with the GC1000 Mark II. Parameters needed to be specified are described
below. For setting procedures, refer to the LCD Panel Operation Manual, IM 11B03A03-05
E.
• Analysis cycle
Time from start (0 second) to stop of analysis
• Warming up time
Time required for displacement in sample streams. An appropriate displacement time
should be determined considering the diameter and length of the sample stream tubing,
sample flow rate and delay time.
A positive value should be specified for the Warming up time. But displacement in sample
streams is implemented before the start of analysis (0 second) so that the Warming up time
actually acts as a negative value.
• Peak detection stop time
Time to stop peak detection compulsorily, which is usually specified to around five seconds
earlier than the pause time. The time must be the analysis cycle time minus one second, or
less.
In case of the GC1000D/GC1000T/GC1000W, the heater should be turned off at the time
of peak detection stop time.
• Pause time
Time when the GC1000 Mark II can be stopped without adversely affecting the column
system. Usually the pause time should be set after peaks of all components have been
eluted (after the peak detection stop time) for the analysis cycle time minus 3 seconds, or
less.
• DO on time/DO off time
These can be used for notifying a supervisory computer or system of analysis end timing
and other information by using contacts. They can also be used as a reading signal when
analog outputs are employed.
• Stream valve on time/stream valve off time
Time to turn on/off stream valves. As stream valves usually turns on from the Warming up
time, the stream valve on time should be set as a negative value. The values to be set
should be the Warming up time minus one second, or more, and the analysis cycle time
minus two seconds, or less.
• V1 to V8 on/off time
Time to turn on/off valve 1 to valve 8 - sample valves, back flush valves, column switching
valves, and atmosphere balance valves. On/off can be set for three times each. The time
to be set should be the Warming up time minus one second, or more, and the Analysis
Cycle Time minus two seconds, or less.
• Initial control temperature
Displayed on the GC1000D/GC1000T/GC1000W that uses a temperature program. The
temperature of the programmed-temperature oven at the start of analysis should be speci-
fied.
• Initial temperature time
Displayed on the GC1000D/GC1000T/GC1000W that uses a temperature program. The
time for holding the initial control temperature should be specified.
3rd Edition : Aug. 23. 2006-00