User guide

348 Advanced User Guide
11 Valves
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.
Switching time In seconds, is a delay between successive
actuator movements. It allows time for the actuator mechanism
to prepare for the next movement.
Invert BCD Complements the BCD input; 1’s become 0’s and 0’s
become 1’s. This accommodates coding convention differences
among manufacturers.
Sample streams in
Selected stream out
Multiposition stream
selection valve
Sampling valve