Concerning the Gas Bench needles:
When we first got our gas bench, it was delivered with a needle attached to
fused silica capillaries which worked very well with the GC-PAL auto sampler.
We have had to replace the original needle due to clogging of the center hole,
and the replacement needles now have one stainless steel and one fused
silica capillary. We were told this is to accommodate the acid pump?
Problem is we don't want to use the acid pump.
The SS capillary develops leaks after a period of time where
it connects to the top of the gas bench when used with the auto sampler
because the metal capillary is not as flexible as the silica
this is easily fixed with a new ferrule, the leaks are very annoying and
sample analysis results if you don't carefully monitor baselines. In some
valuable samples can be lost and eventually the source can pop off during a
run if the problem develops when no one is around to tighten up the fitting
Does anyone know why the double silica capillary gas bench needles are
not available from MAT anymore and where the original supplier can be found?
At 12:53 PM 7/22/2003 -0700, you wrote:
>Is anyone out there familiar with the double flush-fill needles that
>Finnigan supplies with their Gas Bench/CombiPal autosampler system?
>In particular, who makes these? I'm also curious exactly how they are
>built -- e.g. how is the capillary attached (since it obviously can't be
>These are very nicely designed needles, and we would like to get some like
>them built for us, but having different dimensions (longer, and with the
>side port higher up).
Dr. William J. Showers
Dept of Marine, Earth & Atm Sciences
North Carolina State University
Raleigh NC 27695
(919) 515 - 7143 Office
(919) 515 - 7802 Fax
(919) 515 - 3689 Lab
(919) 515 - 7911 Field Lab
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