Fluid pressure responsive electric switch

摘要

A pressure responsive electric switch is described having an elongated base containing an electrical switch and terminals. The base is attached to a sensor assembly (60) which actuates and de-actuates the electric switch in response to pressure to be measured. The sensor assembly has a composite actuator member (62) comprising a plurality of stacked snap-acting disc members which includes at least one snap-acting disc member (17) of a chosen low coefficient of thermal expansion and at least one snap-acting disc member (18) of chosen high coefficient of thermal expansion material so as to provide precise pressure activation/deactivation points over a wide temperature range. In a second embodiment, the composite actuator member includes a thermal adjustment member.