Control and alarm system for freezer case temperature
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Aug 18, 1981
Grant Date -
N/A
app pub date -
Apr 25, 1980
filing date -
Apr 25, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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