Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches
Patent
1991-06-14
1992-12-15
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
200 819M, H01H 900
Patent
active
051720892
ABSTRACT:
A fluid detection device designed to detect the presence of fluids in a flowing or non-flowing state and having the ability to energize or de-energize large current devices such as a swimming pool pump motor. It is equipped with a fluid detector tube designed to be mounted to a vertical fluid carrying conduit such as an intake to a pump. The fluid detector tube has an internal float with permanent magnet and a normally open magnetic reed switch mounted to its exterior. The float with permanent magnet at its highest vertical position closes the magnetic reed switch's contacts and activates a phase shift network. The current through the reed switch is less than fifteen millamps. The phase shift network forward biases a diac which in turn forward biases a traic. The traic completes the connection from a power source to a large current device. The de-energize state of the traic is stabilized by a snubber network. The energize state of the traic is stabilized by the phase shift network and diac. Which permits the voltage drop across the traic main terminals to be less than 1.5 vac when operating a large current device at 15 amperes and 120 vac.
REFERENCES:
patent: 3549839 (1970-12-01), Hill
patent: 4047048 (1977-09-01), Demido
patent: 4057700 (1977-11-01), Nakashima
patent: 4074095 (1978-02-01), Romanowski
patent: 4265598 (1981-05-01), Brand
patent: 4361274 (1982-11-01), Raleigh et al.
patent: 4499347 (1985-02-01), Richards
Wright Jane F.
Wright Robert G.
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