VICI-Valco Catalog #60 289p - page 122

valco valves

www.vici.com

Valco Instruments Co. Inc. Sales:

800–367–8424

Fax: 713–688–8106

121

Heart Cut Trapped in a Loop

and Injected onto a SEcond

Column

Sample is injected (using a separate

injector) onto an analytical column. Early

eluting components (front cut) pass

through a trapping loop and are detected

(at port 3). The valve is then switched,

and the center (or heartcut) which was

retained in the trapping loop is injected

onto the second column to the detector

(at port 4). Late eluting components (end

cut) are trapped on the first column. When

the valve is switched again, the end cut

passes through the trapping loop to the

first detector, completing the analysis.

Two Position Applications

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Loop Samplingwith Two Column

Sequence Reversal

This is ideal for fixed-gas-from-CO

analysis

where no“high boilers”are present.

Column 1 is packed with a porous polymer

and Column 2 with molecular sieve. The

sample loop is loaded in Position A. When

the valve is switched, the loop contents are

sent onto Column 1. As the inorganic gases

and methane leave Column 1 and enter

Column 2, the valve is returned to Position A,

reversing the column sequence. CO

now

leaves Column 1, becoming the first peak.

The inorganics and methane are separated

by the molesieve and pass through the

porous polymer column to the detector.

10 port column switching

Sample Enrichment (Cleanup)

Using Dual Precolumns

Sample is injected by a separate injector

onto one of two precolumns (stripper).

Early eluting components vent at port 6

while components of interest are retained

on the stripper. When the valve is switched,

a new injection is made onto the second

stripper while components retained

on the first stripper are backflushed

onto the analytical column at port 9.

Note:

This application requires an auxiliary

pump at port 4.

10 port column switching

10 port sampling/switching

CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:

sales@chromtech.net.au

Tel: 03 9762 2034

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