Refrigeration – Low pressure cold trap process and apparatus
Patent
1974-04-12
1976-02-17
O'Dea, William F.
Refrigeration
Low pressure cold trap process and apparatus
62 49, 73295, 137392, 340244C, F17C 702
Patent
active
039383474
ABSTRACT:
Level control apparatus for cyrogenic liquids having a cryogenic liquid. Means is provided for introducing cryogenic liquid into the chamber and outlet means is provided to permit removal of the cryogenic liquid from the chamber. Level sensing means is mounted on the flask and has a probe extending into the chamber so that it will come in contact with the cryogenic liquid when the cryogenic liquid reaches a predetermined level within the chamber. The probe includes a thermocouple with a resistor secured to the thermocouple for heating the thermocouple. When the resistor is in contact with the cryogenic liquid, the thermocouple remains cold and provides a signal of one type. When the resistor is uncovered by the cryogenic liquid and the thermocouple becomes hot, a signal of a different type is provided. The signals from the thermocouples are utilized for controlling the entrance of the cryogenic liquid into the chamber and to maintain the liquid level at a predetermined level within the chamber. Two thermocouples and two resistors are utilized for the probe means to greatly reduce the cycling required for operating the filling means for the chamber.
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Riedel Hans J.
Spellman Vernon C.
Capossela Ronald C.
O'Dea William F.
Optical Coating Laboratory, Inc.
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