5Methods
100 Operation Manual
Load time Time in minutes that the valve remains in the Load position before becoming
ready.
Inject time Time in minutes that the valve remains in the Inject position before returning to
the Load position.
The sampling valve cycle is:
1 The sampling valve rotates to the Load position. Load time begins. Valve is not ready.
2Load time ends. The valve becomes ready.
3 If everything else is ready, the GC becomes ready. If anything is not ready:
• If you are using Clock Table or sequence control, the GC waits until everything is ready,
then executes the valve inject command.
• If you are not using Clock Table or sequence control, the valve injection can be made at
any time from the keyboard.
4 The sampling valve rotates (keyboard command or sequence control) to the Inject
position. Inject time begins. The run begins.
5 Inject time ends. Return to step 1.
Multiposition stream selection valve with sampling valve
Several manufacturers provide multiposition stream selection valves that can be driven by
valve drivers 7 or 8. Only one multiposition valve can be configured.
If a valve is configured as a multiposition valve and has a BCD position output connected to
the GC, the valve position can be selected directly.
If the GC has one valve configured as a multiposition valve and another configured as a gas or
liquid sampling valve, it assumes that they are to be used in series. This “double configuration”
can be used to replace an automatic liquid sampler and sample tray in an analytical sequence.
The multiposition valve becomes the sample tray; the sampling valve becomes the injector.
Two configuration parameters provide mechanical and electrical compatibility with most
multiposition valve actuators.
Sample streams in
Selected stream out
Multiposition stream
selection valve
Sampling valve
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