VICI-Valco Catalog #60 289p - page 121

valco valves

120

VICI AG International Sales: + 41–41–925–6200 Fax: + 41–41–925–6201

www.vici.com

Two Position Applications

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Loop Samplingwith Backflush

of Pre-column toVent

When components of interest have low

boiling points, this plumbing scheme allows

“heavy”components with long retention

times to be backflushed to waste. After the

sample loop is loaded in Position A, the valve

is switched to Position B to inject the sample

onto column 1. As soon as all components

of interest have entered column 2, the valve

is switched back to Position A. Column 1

is backflushed to vent during the analysis,

reducing the total analysis time.

Simultaneous Injection of the

Same Sample onto Separate

Columns

In Position A, sample fills the two loops

in series. In Position B, the sample is

simultaneously injected into two separate

flow systems. A single autosampler used

with this flowpath can automate two

analytical procedures for the same sample.

In an important non-chromatographic

application, the roles of carrier and sample

are reversed, permitting two different

quantities of two different materials to be

dispensed together, as in automatic dilution.

Two Different Samples to

Same Column

A 10 port valve permits alternate

injections from the two loops, which

may be identical or of different sizes.

This technique replaces a 4 port sample

selector and a 6 port sample injector.

In Position A, Loop 2 is loaded with

sample 2 while the mobile phase flows

through Loop 1 and onto the column.

In Position B, the Loop 2 sample is injected

onto the column and Loop 1 is loaded with

sample 1. When the valve is returned to

Position A, the Loop 1 sample is injected

onto the column and Loop 2 is reloaded

with sample 2.

10 port sampling/switching

10 port dual external sampling

CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:

sales@chromtech.net.au

Tel: 03 9762 2034

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