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  • Liquid-level controllers designed to keep the level of cryogenic liquids in a container (i.e., liquids below -130 degrees Celsius [-202 degrees Fahrenheit]) between preestablished limits. These controllers usually consist of a level sensor (e.g., cylindrical capacitor, solenoid-based devices), an electronic unit that may include microprocessors, a display, and connecting cables; the devices may also include alarms. Some liquid-level controllers can actuate automatic mechanisms to replenish the cryogenic liquid when it reaches a minimum level. Cryogenic liquid-level controllers are designed to manage the level of cryogenic liquids (e.g., argon, nitrogen, oxygen) inside a tank (e.g., a Dewar flask) and in other cryogenic devices (e.g., cryosurgical units, freezers, containers).
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