Quoting RussellMc <apptechnz@gmail.com>:

>                           If you are on BCC list I think you MAY have use=
ful
> comment to make (be kind)).
>
> EE seemed closer than TECH.
>
> I have a requirement for 1 or  2 (maybe 3) vacuum pumps capable of provid=
ing
> a vacuum of slightly over about 0.5 atmosphere / 50 kPa / 7 psi / 14 inch=
es
> of mercury / at a flow rate (if vacuum flows :-) - of say 1.8 litres /
> minutes or about 3cc/second. That's a very modest requirement by most
> standards.

Sounds like a sampling pump. They're used in IAQ samplers, for example.

If you want to go low-tech, consider some of these fine Chinese
offerings through Harbor Freight (US):

http://www.harborfreight.com/catalogsearch/result?category=3D&q=3Dvacuum+pu=
mp

(--sp, currently in Hunan)



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