Peter,

About pumps: get a lab in a building with industrial compressed air
system...
If you go for the pumps: try some oil free, dry-air pump, be careful to
chose a pump with a large enough bottle for your needs (>3m3, I would
suppose), and put it outside the room... whatever the salesman will say,
they're always TOO noisy...
Classic oil-pumps require some attention, because you have to make sure the
oil level is ok or else it will burn out; also you must take care because
unless there are good oil filters, there is always the possibility that some
oil will get to the valves...you can imagine the rest.
Purge deposits must be emptied more or less once a week, and it is a dirty
task...
ALL pumps, if the bottle (reservoir) for the air is not big enough, will
suffer much if the connections to the valves are leaky: they will keep
pumping all the time, and the life-time will be much reduced.

So... get a lab in a building with a industrial compressor ;-))

Rodrigo



----- Original Message -----
From: "Peter Vervloedt" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 23, 2001 3:10 PM
Subject: [ISOGEOCHEM] N2 vs pressure pump to operate valves in EA CF-IRMS
system


> Hi all,
>
> I was wondering if any of you has experience with the use of pressure
pumps
> to operate the several valves of a typical EA-CFIRMS system. For the
moment
> we're using gas bottles of compressed N2 (N28), but we would like to
switch
> to the use of a pressure pump (due to several reasons).
>
> I would appreciate any tips on this (is efficient? are there several
> possibilities? how about the noise? etc...). Thank you very much!!!
>
> Best regards,
>
> Peter.
>
> _______________________________________________
> Peter Vervloedt
> Laboratory Of Applied Physical Chemistry
> Ghent University
> Coupure 653
> 9000 Gent
> Belgium
>
> tel.: +32 9 264 6000
>       +32 9 264 6048
> e-mail.: [log in to unmask]
> ____________________________
> Summer School " Buffer zones for water pollution control"
> 29 August - 7 September 2001
> Gent, Belgium
> More information at:
> http://fltbwww.rug.ac.be/isofys/summerschool/bufferzones
> _______________________________________________
>