110 Advanced User Guide
6 Valves
The Valve Box
The GC holds up to three valves in a heated valve box on top of
the oven.
The valve box is the preferred location for valves because it is a
stable temperature zone, isolated from the column oven.
Heating the valves
The valve box contains a heated block with two valve mounting
locations (shaded in Figure 5). The middle hole on each block is
used to pass tubing into the column oven.
If two valves are used, they share the same temperature
setpoint.
Valve temperature programming
Most valve applications are isothermal; however, you can define
three temperature ramps if desired. Program this ramp the
same as an oven ramp. Refer to “Setting the oven parameters for
ramped temperature” on page 52 for more information.
Figure 5 Diagram of valve locations on GC
Valve heater block
Valve box, cover
removed
Back of chromatograph
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