Refrigeration – Low pressure cold trap process and apparatus
Patent
1991-05-20
1992-10-27
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
62127, 55269, 417901, B01D 800
Patent
active
051579286
ABSTRACT:
A cryogenic vacuum pump includes, in an integral assembly, temperature sensors and heaters associated with the first and second stages of the cryopumping array, a roughing valve and a purge valve. An electronic module removably coupled in the assembly responds to all sensors and controls all operations of the cryopump including regeneration thereof. System parameters are stored in a nonvolatile memory in the module. Included in the regeneration procedures are an auto-zero of the pressure gauge, heating of the array throughout rough pumping, and a change in pressure rate test to determine stall in rough pumping. The electronic module also restarts the system after power failure, limits use of a pressure gauge to safe conditions, provides warnings before allowing opening of the valves while the cryopump is operating and stores sensor calibration information. Control through a control pad on the pump may be limited by a password requirement. Password override is also provided.
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Bender Steven A.
Eacobacci Michael J.
Gaudet Peter W.
Harvell John T.
Lepofsky Robert J.
Capossela Ronald C.
Helix Technology Corporation
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