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Valved Systems
The 3800 can be equipped with a variety of valving options, including gas
sampling valves, liquid sampling valves and switching valves. There are
numerous locations for valves on the 3800, some of which are unheated and
others that are heated. All valves can be automated regardless of location.
The following are the typical locations for valves on the 3800:
•
Unheated Valves located on the top panel of the instrument, beneath the
injector cover. The area behind the injectors can accommodate up to
two unheated valves.
•
Single or dual valve ovens which replace one or two injector positions on
the 3800. The single valve oven can accommodate one valve and an
optional 1041 or 1061 injector. The dual valve oven accommodates one
or two valves.
•
A multi-position valve oven which can accommodate up to six standard
valves with 4 - 10 ports, or one 12 port or larger valve (including a
Stream Selector Valve) and four standard valves. This valve oven is
mounted over the rear injector position and utilizes one heated zone.
•
Up to three valves can be installed on the right side of the column oven.
This is the least preferred location due to temperature cycling of the
column oven.
Heated
Zones for
Valves
If valves are located in a valve oven then they are configured in 3800 Setup
as front, middle or rear valve ovens. The valve oven temperature is
programmed in the Sample Delivery section of the method. Note that when
multiple valves are installed in one valve oven the temperature of the oven
should always be set lower than the lowest temperature rated valve. In
general valves have upper temperature ratings of 220
°
C or 350
°
C.
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