Proximity sensor with zero adjustment
AssigneeBailey Meter Company
InventorKenneth W. Cohen
Life of this patent
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Abstract
A fluidic device having a sensing nozzle remotely mounted from an emitter assembly and communicating with it through a connecting tube. An adjustable nozzle assembly, located within the emitter assembly, is movable with respect to an outlet and aligned orifice to provide a zero level output signal from the outlet for various lengths of connecting tube. The nozzle assembly is also adjustable to provide a range independent zero level output signal for different pressure level sensitivities. A test jack communicates with the outlet to monitor the output signal and provide for adjusting the zero level output signal.
Claims2
In a proximity sensor, the combination comprising an emitter assembly having a cylindrical passageway, a fixed orifice disposed in said passageway dividing the passageway into an output chamber and a b ack pressure chamber, a sensing nozzle connected to said back pressure chamber for wasting pressure fluid from the back pressure chamber in inverse proportion to the proximity of an object to the sensing nozzle, an orifice tube located within said output chamber axially aligned with said fixed orifice adapted to be connected to a source of pressure fluid and discharge a jet of pressure fluid through said fixed orifice into said back pressure chamber, and means for axially positioning said orifice tube to thereby vary the pressure in said output chamber for a given pressure in said back pressure chamber.
Dependencies are inferred from the claim text.