Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-09-27
1990-07-03
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340605, 340620, 200 6104, 73304R, G08B 2100
Patent
active
049395041
ABSTRACT:
A fluid detecting alarm system includes a source of electric current, an alarm electrically connected to the source, a normally open switch electrically connected to the alarm for de-energizing the alarm when the switch is open and energizing the alarm when the switch is in current-conducting condition, and a medium, responsive to the presence of the fluid, for causing the switch to conduct current. In particular, a self-contained liquid water detecting system has a well with a mouth opening through a lower wall of a case. The switch takes the form of two electrodes, spaced apart, and bridged by a dry pulverulent salt, substantially nonconductive when dry and conductive when wet. The open mouth of the well is closed by an adhesive coated foraminous sheet, to retain the salt but to permit liquid water to pass through to wet the salt to cause it to conduct sufficiently to energize the alarm.
REFERENCES:
patent: 3069671 (1962-12-01), Taylor
patent: 3492449 (1970-01-01), Kenny
patent: 4126857 (1978-11-01), Lancia et al.
patent: 4264902 (1981-04-01), Miller
Hofsass Jeffery A.
Orsino Joseph A.
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