Importance

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Abstract

The sensor comprises a body in which a diaphragm is mounted so as to define a variable-volume chamber to which a fluid pressure is supplied in use, and a plurality of electrical switches connected to the diaphragm so that the diaphragm can bring about switching of the switches when the pressure in the chamber exceeds corresponding different threshold values which are predetermined by associated calibration means including, for each switch, a respective spring the compression of which can be varied by means of a corresponding reaction member the position of which relative to the body is adjustable.The reaction members are connected rigidly to the ends of an interconnection structure translatable in a guide structure. This guide structure comprises a plurality of laterally-slotted, tubular guide projections, each for guiding a corresponding reaction member, and an intermediate guide projection for guiding the sliding of a central portion of the interconnection structure with which are associated a resilient member tending to bring about a relative movement between the interconnection structure and the body and a snap locating device for restraining the interconnection structure selectively, against the action of the resilient means in one of a plurality of positions relative to the body, in each of which respective different pressure threshold values are associated with the electrical switches.

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First Claim