Hoxan Co., Ltd.

Yasuhiro Tsuchida

Yasuo Kuraoka

A cryostatic system utilizing a liquefied gas in which an object or substance to be cooled in a thermostatic chamber without a stirrer and electric heater therein is cooled initially by a liquid coolant at a cryogenic temperature for rapidly lowring its temperature to an intended level and, upon reaching the proximity of said intended level, a temperature sensor detecting the same actuates a temperature controller controlling a heat exchanger, which when actuated gasifies the liquid coolant and controls the temperature of the thus gasified coolant. Thus, upon reaching the proximity of said intended level, said object or substance is cooled by the gasified coolant to be thermostatically controlled thereto with a minimized coolant consumption. Alternatively, upon reaching said intended level, the input to the temperature controller is changed over to an output of another temperature sensor detecting the temperature of said gasified coolant, so that the temperature of said object or substance is thermostatically controlled to said intend level in accordance with the thus detected temperature of the liquefied gas sprayed thereonto.

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Sapporo, Japan

Yasuhiro Tsuchida