Automatic electronic ice-making control system for automatic ice

Refrigeration – Automatic control – By congealed removable product condition

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62209, F25C 100

Patent

active

039778517

ABSTRACT:
An automatic electronic ice-making control system for automatic ice-making machines including an ice-making chamber in which is arranged a semiconductor temperature sensitive element which may comprise a thermistor, which translates temperature changes into resistance changes and for terminating an ice-making cycle a differential amplifier is provided in which said thermistor is connected as a temperature sensitive element, a variable resistance element sensitive to ambient changes being provided in said differential amplifier in series connection with said thermistor across a voltage source, the variable resistance element compensating the characteristics of the thermistor in accordance with atmospheric ambient temperature changes to actuate with an output signal derived from the differential amplifier a Schmidt circuit and relays in accordance with temperature conditions prevailing in the ice-making chamber and compensated for ambient temperature changes, thereby to terminate the ice-making operation upon production of substantially the same quantity of ice independent of the season of the year during which the ice-making machine is operative.

REFERENCES:
patent: 3283526 (1966-11-01), Le Boeuf

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