Yes we swap them when this happens and then send the broken bellows to Provac (UK) for repair.  You should remove the bellow from the valve assembly. This is fairly easily as long as the split pin is not jammed.  Then just send this part to Provac.  I think it cost about $700-800 last time.

From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Wei Huang
Sent: Monday, April 10, 2017 12:19 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Thermo bellows leak

Dear Isogeochem,

Our Thermo bellows (reference side, Delta V plus) had a slow leak, about 2.6 mbar/min. I checked the valves around the bellows, and they should be fine. I was wondering if it is just a sealing problem which could be fixed easily? or it is a time to replace the whole bellows with a new one? Does anybody have an instruction to do it? I will appreciate it.

Another question, since we normally don't need the other bellows (sample side), is it possible to swap them? Is there anything I need to pay attention when I swap/replace the bellows? Thanks a lot in advance!

Wei Huang, Ph.D.

Stable Isotope Lab Manager

New Core Lab Rm#212

Lamont-Doherty Earth Observatory of Columbia University
61 Route 9W
Palisades, NY 10964
Lab: 845-365-8143
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