Dear David,

In your recent reply to Dr Tsunogai you hit the nail on the head. It
is indeed the inner diameter (I.D.) of the interface capillaries
that's important (in conjunction with their length).

The ref gas capillary should be 0.05 mm I.D. whereas the sample
capillary coming from the open split should be 0.1 mm I.D.. These
were the dimensions on my Delta S fitted with the GC Combustion II.

Depending on supplier, the O.D. of 0.05 mm I.D. capillaries can
vary from 0.23 mm to 0.30 mm whereas 0.1 mm I.D. capillaries come in
O.D.s from 0.15 mm to 0.3 mm.

So, the take home message is to check the I.D. as this is the
performance limiting factor. Varying O.D.s can be easily accommodated
by matching ferrules and/or diligent use of a ferrule drill.


Cheers,
                   Wolfram


*****************************************************
Dr. W. Meier-Augenstein, CChem MRSC
Lecturer/Research Fellow

University of Dundee, Dept. of Anatomy & Physiology,
Small's Wynd, DUNDEE  DD1 4HN, United Kingdom

Tel.: +44-(0)1382-34/5124, /4968

Fax:  +44-(0)1382-34/5514

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URL: http://www.dundee.ac.uk/anatphys/wma/wolfram.htm
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