Differential pressure switch including a vertical diaphragm, a reed switch activated by a first magnet and additional magnets for positioning the diaphragm and the first magnet
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United States of America Patent
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-
Dec 22, 1992
Grant Date -
N/A
app pub date -
Jan 9, 1992
filing date -
Jan 9, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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