Electronic refrigeration unit temperature alarm

Details Electronic refrigeration unit temperature alarm Electronic refrigeration unit temperature alarm

1998-12-17

2000-03-07

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

62126, 62127, 62129, 340529, 340588, 340589, G08B 2100

Patent

active

060346078

ABSTRACT:
An electronic freezer thermometer alarm computes an estimation of contents temperature in a freezer from the freezer air temperature. The calculated contents temperature is displayed by a LCD display and is used to trigger a sound alarm, by use of a piezoelectric buzzer, in case of too high a value. Alternatively, the freezer air temperature is used to start a timer that triggers the alarm several minutes after the freezer air temperature have risen above the limit value. In this case, the displayed temperature is the freezer air temperature. In both cases, freezer air temperature acquisition is done by the resistance measurement of a thermoresistor placed into a small case constituting the temperature probe. The thermometer housing has two magnets to keep on freezer external surface. The temperature probe is connected to the housing by a small thickness of wire going under the freezer door gasket. The thermometer is energized by a lithium battery placed into the case. The housing encloses a printed circuit board on which are off-the-shelf electronics components.

REFERENCES:
patent: 4146886 (1979-03-01), Timblin
patent: 4490986 (1985-01-01), Paddock
patent: 4604871 (1986-08-01), Chiu et al.
patent: 5262758 (1993-11-01), Nam et al.
patent: 5917416 (1999-06-01), Read

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