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10-port Gas Sampling Valves & 22-port Stream Selector Valves - SRI Instruments
10 Port Gas Sampling Valves & 22 Port Stream Selector Valves
65-66
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Heated, thermostatted valve oven
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Standard & custom plumbing configurations
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Electronically actuated with PeakSimple control or manually actuated
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1or 2 valve capability
SRI uses 10 port gas sampling valves because they provide more analytical flexibility for the same cost as four or six
port valves. 10 port gas sampling valves can easily be plumbed to replicate the function of the simpler valves, while
offering many other possible configurations, including: Inject Only, Inject and Backflush, Pre-column Backflush to
Vent, Column Sequence Reversal, Alternate Loop Inject, and Dual Loop-Dual Column. Many more plumbing
configurations are possible, especially when multiple valves are plumbed together.
The heated valve oven can be adjusted from ambient to 175°C (up to 300°C for a manual valve). It mounts on the 8610
GC, and can accommodate two electrically actuated and one manually operated valve. Because the valve oven is right
next to the column oven, tubing runs are short with no cold spots, which results in sharper peaks.
Shown above are dual 10-port gas sampling valves in the heated
valve oven of a dual
.
Shown above is a 22-port stream selector valve on our
.
Each valve includes 1/8" stainless steel bulkhead fittings on the front of the valve oven for sample in/out connections.
A single heated (375°C max) fast-cooling adsorbent trap plumbed as the loop of the gas sampling valve is also available
for applications where sample concentration is desired. The trap cools to a user-controlled setpoint, not just to
ambient temperature, so the adsorbent characteristics (water rejection, etc.) can be manipulated.
The valve plumbing configuration shown at right is the standard 6-
port configuration. The sample loop is inserted into the carrier gas
stream when the valve is rotated to the INJECT position.
The same 10-port valve can also be configured to backflush the
column when the valve is rotated. Backflushing can often shorten
the analysis by eliminating the need to program the column
temperature up to elute high boiling analytes.