Hi Joe,

We purchased a Delta V Advantage IRMS which came with a Pfeiffer Duo-2.5 roughing pump.  On the advice of the Thermo Service Engineer, we purchased a Zeolite trap from Pfeiffer. The Zeolite filling (from Pfeiffer) was already degassed. While the trap was easy to install between the roughing pump and the Turbo-pump, it required a couple of extra clamps that I had to buy from Pfeiffer separately. The trap was a tight fit but with a little finessing it fit.

Regards,
Randi

Randi C. Schneider
Analytical Lab Manager
Marine Science Dept.
University of Hawaii Hilo
Ph.(808)933-3494 Fax(808)933-0423

----- Original Message -----
From: Joe Lambert <[log in to unmask]>
Date: Monday, November 13, 2006 11:21 am
Subject: [ISOGEOCHEM] High Vacuum Safety Valve
To: [log in to unmask]

> Hello Everyone,
> 
>     I'm writing to ask if anyone has taken the extra precaution 
> to install
> any type of oil trap between the roughing pumps and turbo pumps on 
> any of
> the Delta series IRMS's from what is now Thermo-Electron.  We have 
> a Delta
> Plus and recently encountered the problem of oil backstreaming 
> into the
> source turbo (Pfeiffer pumps).  We use a zeolite based oil/water 
> trap for a
> number of extraction lines where space is not an issue.  It would seem
> somewhat hard to plumb this large of a trap into the compact IRMS. 
> Can
> anyone recommend a smaller trap (NW-25 fittings) or a part number 
> for an
> additional anti-suck-back type valve?  We are currently unsure of 
> the reason
> for the oil backstreaming problem, but we certainly would like to 
> protectourselves from future events.
> 
> Sincerely,
> 
> Joe Lambert
> Alabama Stable Isotope Laboratory
>