Alarm circuit suitable for monitoring freezer temperature

Details Alarm circuit suitable for monitoring freezer temperature Alarm circuit suitable for monitoring freezer temperature

1975-04-17

1976-08-24

Caldwell, John W.

Communications: electrical

Systems

Call station

340227R, 307310, 73362AR, G08B 2100

Patent

active

039769852

ABSTRACT:
A solid state electronic alarm circuit including means for sensing a predetermined change in a parameter such as the temperature in a freezer or the like from a predetermined safe limit and means for generating an audible alarm in response thereto.

REFERENCES:
patent: 3569964 (1971-03-01), Mande
patent: 3636540 (1972-01-01), Harris
patent: 3753259 (1973-08-01), Donovan
patent: 3813551 (1974-05-01), Broadbent

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