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 ____ And, one of those is a venturi pump - driven by an airline. At 90 psi and 4 cfm they say that it will provide a vacuum of 28" of mercury. Interesting that people actually sell them. Useful in a shop with an air system - but quite a lot of air for what it does. (But BOTE figuring says that that's < 1 Watt - doesn't feel right but figures seem to check out. later ...) Russell On 19 October 2010 04:35, wrote: > Quoting RussellMc : > > > If you are on BCC list I think you MAY have > useful > > comment to make (be kind)). > > > > EE seemed closer than TECH. > > > > I have a requirement for 1 or 2 (maybe 3) vacuum pumps capable of > providing > > a vacuum of slightly over about 0.5 atmosphere / 50 kPa / 7 psi / 14 > inches > > 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+= pump > > (--sp, currently in Hunan) > > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .