Hi David,


I have a colleague that recently replaced the Duo 2.5 in a Delta V with an Edwards EM 1.5 and he has been very happy with the alternative.  The Edwards is much quieter, runs cooler and seems to perform just as well.  The physical size is comparable to the duo.







Benjamin Harlow

Manager, Stable Isotope Core Laboratory

Washington State University

School of Biological Sciences

367 Eastlick

Pullman, WA  99164-4236


Office:  509-335-6161

Lab:     509-335-6154

Fax:     509-335-3184


Laboratory for Biotechnology and Bioanalysis (LBB2) Stable Isotope Core




From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Denhaan, David
Sent: Tuesday, January 08, 2013 9:50 AM
To: [log in to unmask]
Subject: [ISOGEOCHEM] Duo 2.5 replacement on the Delta V


Dear List,


The Duo 2.5 roughing pump on my Delta V failed and I need a replacement.  Pfeiffer no longer sells that model.  Can I use their Duo 3?  Peiffer wasn’t sure if there were any modifications needed for use on the Delta V.




David Denhaan


Ames, IA

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