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.
Click below to change the valve position. (Currently shown in Position A)
A: Loops 1 and 2 filled
B: Contents of Sample loop 1 injected onto Column 1,
contents of Sample loop 2 injected onto Column 2