At 09:50 AM 11/13/00 +0100, you wrote:
>I agree completely with your comments. The liner volume is only 120 ul for
>the HP 6890 PTV, so it is very important to be aware of
>pressure/temperature/volume correlations as you say. Just curious if these
>problems are actually relevant to all modern GCs - do they all use the same
>type of flow or pressure sensors? Thermoquest said no problem with flooding
>liners with their new systems in terms of maintained flows and pressures -
>not true than you think? I think it would be a relavant feature, not having
>the injector performance collapse when some overflow occurs.
>Lars

I suppose it would be possible to overcome the problem from an
instrumentation point of view, either by having liquid traps in the lines
or by having all of the inlet system heated (gas lines, purge valves, etc.)
so that any vapor that floods out of the liner stays as a gas all the way
to the purge/split vents. It still, of course, does not solve the
analytical problem. If you routinely need to inject that much sample to see
your analyte, you may want to consider some type of pre-injector
concetrator, such as a thermal desorption or purge and trap unit. This way
you could look at even larger volumes with no risk of overloading the inlet.

Howard