ISOGEOCHEM Archives

Stable Isotope Geochemistry

ISOGEOCHEM@LIST.UVM.EDU

Options: Use Forum View

Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Dave Mattey <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Date:
Mon, 20 Oct 1997 14:23:07 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (23 lines)
I used to use swagelock fitting to secure Kel-F fingers until one did slip
off when warming up after being frozen down. The result was not
catastrophic but decidedly unpleasant. If you use swagelocks then a back up
clamp is essential.

An alternative (and safer) solution is to use a VCO face seal fitting,
fitted with a hard PTFE or a Kalrez O-ring. A retaining flange is machined
onto the top of the Kel-F tube so that the finger is at all times captive
in the fitting and cannot slip off. Vacuum performance is fine.


Dave Mattey

Geology Dept, Royal Holloway College, University of London, Egham Hill,
Egham, Surrey, TW20 0EX

Tel:      01784  443587          Office
                443105          Isotope lab office
                        443637          Prism lab
                        443629          Optima lab

                        471780          FAX

ATOM RSS1 RSS2