HI Greg--

I'm just using the standard capillary (alas, on XP), but I take it they 
still have the SGE valves.  If you have multiple inlets, have you tried 
switching the conflo to another inlet on the mass spec?  If not, does 
the valve easily close and open?  You can over heat and over tighten the 
valves (valve seat), so it may not be fully open.  The valve may clog 
too, especially if a piece of capillary breaks off inside it (not that 
that ever happened to me ;)  And of course there is the ever popular 
"capillary pulled inside ferrule" when tightening--even when I 
"pre-tighten" them.  The only other issue, barring clogs,  that comes to 
mind is that you may have an extra long length of capillary. 

good luck...

take care

gerry

Greg Michalski wrote:

>My delta V seems to be pumping too good...In conflo I have 3 10-7 torr so my 
>signal for a 2 microliter of N2O (~100nmol) is only ~1 volt which seems about 
>an order of magnitude too low...This is after changing the inlet from 50 
>micron to 100 micron capillary.  Ive cut ends off twice to ensure no blockage, 
>but still good vacuum.  Is going to 200 micron an option anyone else has 
>tried? 
>
>  
>