Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-07-26
1991-08-20
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
116101, 337298, 337332, G08B 2100
Patent
active
050418165
ABSTRACT:
A freezer alarm system is energized by a battery (2) or an AC power adapter (3) to drive a piezo alert pulsing buzzer (4) when activated by one of two sensor modules. An electrolyte freezer alarm sensor (13) has a non-conducting wall (9) and two conducting elements (9), and it contains electrolyte solution (10) and a small air expansion space (11). Alternatively, a modified mercury switch freezer alarm sensor has non-conducting walls (9) which form a tube that is square in cross-section; two conducting elements (12) that are placed at separate points in the vertex of one angle; and contains mercury (15), freezable liquid (14) and an air expansion space (11). The modified mercury switch freezer alarm sensor can also be used as a sensor component of home burglar alarm systems which are activated by breaking a closed electrical circuit.
REFERENCES:
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patent: 4144532 (1979-03-01), Boyd
patent: 4325059 (1982-04-01), Jaye
patent: 4855721 (1989-08-01), Hallett et al.
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