Pressure transducer including a proximity sensor

Details Pressure transducer including a proximity sensor Pressure transducer including a proximity sensor

1983-03-14

1985-05-28

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Piston

73 4R, 200 82A, 307118, G01L 716, G01L 910

Patent

active

045192561

ABSTRACT:
Fluid under pressure is routed through an input port to a bore provided within a housing. A piston is disposed within the housing for movement within the bore. A target member includes a piston portion which frictionally engages, and is received within, the wall of a bore provided in the piston, causing the piston and target to move as a unit. A proximity sensor mounts to the housing in a location to switch to its activated state in response to displacement of the target member to a position corresponding to a predetermined fluid pressure level. Spring packs, exhibiting a predetermined wear characteristic, resiliently bias the piston to resist displacement due to applied fluid pressure. Compensation for spring pack wear and bearing contact wear is automatically provided by increased penetration of the target member piston portion into the piston bore upon application of a fluid pressure substantially in excess of the switching level, whereby the proximity sensor is activated at a set fluid pressure level substantially independent of spring pack system wear.

REFERENCES:
patent: 3419692 (1968-12-01), Palen
patent: 3548133 (1970-12-01), Clauson
patent: 3746810 (1973-07-01), Parsons et al.
patent: 4071725 (1978-01-01), Smith et al.
patent: 4213021 (1980-07-01), Alexander
patent: 4254312 (1981-03-01), Migrin et al.

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