Importance

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Abstract

A refrigerant transducer assembly has a housing with first and second interconnected openings, and the first opening is adapted to be installed in a refrigeration system for connection to the fluid presesure to be measured. A cartridge is threaded into the second opening, and within the cartridge is a pressure transducer in a transducer chamber. The pressure transducer may need servicing and, to do so, the cartridge is unthreaded from the housing, with the initial unthreading closing a first valve controlling fluid flow between the first and second openings. Conversely, as the cartridge is reinstalled on the housing, the final threading during tightening opens the first valve. This minimizes leakage of refrigerant to atmosphere for servicing. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

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First Claim