Valves; The Valve Box; Heating The Valves; Valve Temperature Programming - Agilent Technologies 7820A Advanced User's Manual

6

Valves

The Valve Box

Heating the valves

Valve temperature programming

110
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.
Valve heater block
Valve box, cover
removed
Figure 5 Diagram of valve locations on GC
The valve box contains a heated block with two valve mounting
locations (shaded in Figure
used to pass tubing into the column oven.
If two valves are used, they share the same temperature
setpoint.
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
ramped temperature"
Back of chromatograph
5). The middle hole on each block is
"Setting the oven parameters for
on page 52 for more information.
Advanced User Guide