Multiposition Stream Selection Valve And Sampling Valve - Agilent Technologies 6890 Series Operating Manual

• 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 and sampling valve

Several manufacturers provide multiposition stream selection valves that can
be driven by valve drivers 1 through 4. Only one multiposition valve can be
configured. See Table 22 on page 192 for the electrical details.
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.
Multiposition
stream selection
valve
Sample streams in
Figure 34 Multiposition valve with gas sampling valve
If the GC has one valve configured as a multiposition valve and another
configured as a gas sampling valve, it assumes that they are to be used as shown
in Figure 34. This "double configuration" can be used to replace an automatic
Carrier in
Loop
Selected
stream out
Valve Control
Valve control examples
To column
Load
position
To waste
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