Liquid immersion alarm

Details Liquid immersion alarm Liquid immersion alarm

1986-04-15

1987-12-22

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340620, 340539, 200 6104, 441 89, G08B 2300

Patent

active

047149140

ABSTRACT:
A liquid immersion alarm is shown having a remote transmitter activated by a water immersion switch to generate an alarm signal. The alarm signal is received by a receiver that activates an alarm. Immersion of the transmitter and its immersion switch momentarily into water will not set off a false alarm due to a delay circuit associated with the transmitter. Once immersed, entrapped air will not interrupt the delay circuit from setting off the alarm due to a second delay circuit.

REFERENCES:
patent: 3122736 (1964-02-01), Weber
patent: 3399399 (1968-08-01), Apfelbaum
patent: 3530855 (1970-09-01), George
patent: 3810146 (1974-05-01), Lieb
patent: 4127847 (1978-11-01), Stifter
patent: 4216468 (1980-08-01), Kaufmann
patent: 4305143 (1981-12-01), Simms et al.
patent: 4502044 (1985-02-01), Farris et al.
patent: 4540976 (1985-09-01), Wegrzn
patent: 4603327 (1986-07-01), Leonard et al.

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