Abstract
A simple, inexpensive, solid-state controller is described which maintains an uninterrupted supply of liquid nitrogen by switching a solenoid valve from one supply cylinder to another when the first becomes exhausted. The device is used in conjunction with a commercial liquid-nitrogen level controller. The circuit uses a 7474 flip-flop as a bistable memory element, a thermistor temperature sensor, and a clock to wait an appropriate interval for the liquid-nitrogen transfer line to become cold. With minimal modification the circuit could be used with other cryogenic liquids or with compressed gases.
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