US 6,981,421 B2 | ||
Pressure gage and switch | ||
Brian L. Palmer, Michigan City, Ind. (US); Daniel A. Heuer, New Carlisle, Ind. (US); and Ronald R. Krueger, Michigan City, Ind. (US) | ||
Assigned to Dwyer Instruments, Inc., Michigan City, Ind. (US) | ||
Filed on May 27, 2004, as Appl. No. 10/855,119. | ||
Claims priority of provisional application 60/474138, filed on May 29, 2003. | ||
Prior Publication US 2004/0237660 A1, Dec. 02, 2004 | ||
Int. Cl. G01L 9/11 (2006.01) |
U.S. Cl. 73—735 | 19 Claims |
1. A pressure gage adapted to provide a mechanical indication of a sensed pressure and to provide an electrical signal indicative
of the sensed pressure, said pressure gage comprising:
a first inlet port adapted to be placed in fluid communication with a first fluid source;
a second inlet port adapted to be placed in fluid communication with a second fluid source;
a housing including a first fluid pressure chamber in fluid communication with said first inlet port, a second fluid pressure
chamber in fluid communication with said second inlet port, and a flexible diaphragm separating said second fluid pressure
chamber from said first fluid pressure chamber;
a magnet coupled to said diaphragm such that movement of said diaphragm causes a related movement of said magnet;
a helix located adjacent said magnet, said helix adapted to rotate about an axis;
a pointer attached to said helix for conjoint rotation with said helix about said axis; and
a Hall effect sensor located adjacent said magnet;
whereby movement of said magnet in response to movement of said diaphragm rotates said helix and said pointer to provide a
mechanical indication of the pressure sensed by said diaphragm, and said movement of said magnet causes said Hall effect sensor
to generate an electrical signal indicative of the pressure sensed by said diaphragm.
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