Differential pressure switch including a vertical diaphragm, a r

Details Differential pressure switch including a vertical diaphragm, a r Differential pressure switch including a vertical diaphragm, a r

1992-01-09

1992-12-22

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 82E, 335207, H01H 3534

Patent

active

051735792

ABSTRACT:
The invention comprises a differential pressure switch including a housing which defines a cavity. A diaphragm with a pair of magnets mounted thereon is attached within the housing and vertically disposed across the cavity. This divides the cavity into a high pressure chamber and a low pressure chamber. A high pressure port and ducts in the housing place the medium to be detected in communication with the high pressure chamber. A low pressure port and ducts in the housing place the medium to be detected in communication with the low pressure chamber. The ducts also allow the chambers to drain. A reed switch is attached to the housing proximate the first magnet for maintaining the reed switch in an open state. A third magnet is positioned on the side of the diaphragm opposite the reed switch and in opposition to the second magnet for setting the switch. The third magnet may also be used to adjust the pressure differential required to actuate the reed switch.

REFERENCES:
patent: 3285183 (1966-11-01), Hembree
patent: 3859619 (1975-01-01), Ishihara
patent: 3898403 (1975-08-01), Grayson
patent: 3989911 (1976-11-01), Perry
patent: 4084072 (1978-04-01), Tsubota
patent: 4266517 (1981-05-01), Sakakibara et al.
patent: 4739135 (1988-04-01), Custer
patent: 4827095 (1989-05-01), Clark et al.
patent: 4858647 (1989-08-01), Custer
Welker Engineering Co., Differential Flow Switch Style FS-2, Date Unknown but prior, 1 page, United States.
Welker Engineering Co., Differential Flow Switch Style FS-3, 1989, 1 page, United States.
Y-Z Industries, Inc., Electronic Differential Pressure Switch, 1986, 2 pages, United States.

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