A
Anonymous
Guest
On page 120 of the 20 February 2003 issue of the trade magazine "Machine Design" (www.machinedesign.com) there is an interesting article "Prox switches sense further" by one Peter Heimlicher, Managing Director of Contrinex, Inc in Ft. Lee, NJ.
The article describes their "Condet" line of inductive proximity switches, which are based on pulse induction metal detection technology, although they don't come out and say so. The detector unit is made of stainless steel, and the PI circuit senses metals right through a thin sheet of stainless steel, allowing the unit to be rugged and totally sealed. Typical sensing ranges are about 6 millimeters. The PRF is a kilohertz or less, larger units having lower PRFs.
Contrinex's website has technical info, but one can't tell that PI is the underlying technology from their website.
The best source of technical information are two US Patents, 6,133,654 and especially 6,130,489, which has schematics and waveforms. The patents are available from (http://patft.uspto.gov/netahtml/srchnum.htm).
Joe
The article describes their "Condet" line of inductive proximity switches, which are based on pulse induction metal detection technology, although they don't come out and say so. The detector unit is made of stainless steel, and the PI circuit senses metals right through a thin sheet of stainless steel, allowing the unit to be rugged and totally sealed. Typical sensing ranges are about 6 millimeters. The PRF is a kilohertz or less, larger units having lower PRFs.
Contrinex's website has technical info, but one can't tell that PI is the underlying technology from their website.
The best source of technical information are two US Patents, 6,133,654 and especially 6,130,489, which has schematics and waveforms. The patents are available from (http://patft.uspto.gov/netahtml/srchnum.htm).
Joe