When you "bypass" the combustion what exactly do you do (or how do you do 
this), e.g. GC column end-union-capillary-union-capillary-water trap?

Wolfram


On Apr 7 2007, Chancy Fessler wrote:

> Hi,
>  
> Our GC-IRMS (253) has been down for over 4 months.  Now that we have the
> MS up and running (we think), we don't see any argon peak when we close
> the backflush in the oven and inject air.  If we bypass the combustion
> tube and inject air, we see a great peak.  We've tried changing the
> combustion tube twice and also the capillary attached to it in case it
> was clogged.  We've also check the ferrules, etc.  Anyone have any
> suggestions?
>  
> Thank you,
> Chancy Fessler
> SRA II
> Kinemed, Inc.
> 5980 Horton Street, Suite 400
> Emeryville, CA 94608
> (510) 655-6525 x 170
>  
>