Control and alarm system for freezer case temperature

Details Control and alarm system for freezer case temperature Control and alarm system for freezer case temperature

1980-04-25

1981-08-18

Wayner, William E.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62223, 62130, 236 78R, 236 94, F25B 4900, G05B 1500, G05B 2300

Patent

active

042839211

ABSTRACT:
The temperature within a freezer case or refrigeration compartment is operatively determined and controlled by a control system employing a microcomputer which operatively controls a refrigeration system associated with the freezer case. A sensing element is operatively connected to the microcomputer for supplying a signal representative of the freezer compartment temperature. Temperature selector switches establish upper and lower limits of a desired range of temperatures for the freezer case and another selector switch establishes an alarm condition temperature limit. The microcomputer follows a program of comparing the compartment temperature to the upper limit, the lower limit and the alarm condition limit. During normal operation, the microcomputer also controls a refrigerant valve to regulate the compartment temperature within the desired range. If the compartment temperature elevates to the alarm condition limit, the microcomputer energizes a first alarm. If the alarm condition remains for a predetermined time period, a second emergency alarm is energized.

REFERENCES:
patent: 3431399 (1969-03-01), Venning
patent: 3942718 (1976-03-01), Palmieri
patent: 4154397 (1979-05-01), Carlson
patent: 4200910 (1980-04-01), Hall
patent: 4234927 (1980-11-01), First
patent: 4240077 (1980-12-01), Hughes et al.

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