Abstract: A pressure switch includes an actuation unit disposed within a body of the pressure switch and biased in a first direction by a spring arrangement and accessible at a fitting end of the pressure switch to be movable in a second direction against the bias of the spring by fluid at the fitting end. The actuation unit includes a limiter trapped in a pocket to limit the range of travel of the actuation unit, thereby safeguarding the electrical switch element from sustaining damage due to excessive travel. The pocket may be formed by the cooperation of two separate pieces. The spring arrangement may be biased by another piece disposed within a body of the pressure switch.

Abstract: A pressure switch includes an actuation unit disposed within a body of the pressure switch and biased in a first direction by a spring arrangement and accessible at a fitting end of the pressure switch to be movable in a second direction against the bias of the spring by fluid at the fitting end. The actuation unit includes a limiter trapped in a pocket to limit the range of travel of the actuation unit, thereby safeguarding the electrical switch element from sustaining damage due to excessive travel. The pocket may be formed by the cooperation of two separate pieces. The spring arrangement may be biased by another piece disposed within a body of the pressure switch.

Abstract: A pressure transducer (50) of the type utilizing a diaphragm (8) with strain sensitive elements (14) formed in the diaphragm surface where the strain sensitive elements (14) are connected to an electronics assembly (4) to produce an electrical output in response to deflection of the diaphragm (8). A diaphragm assembly (26) is bonded to an intermediate support member (28) which is in turn bonded to a main support member (32) which is joined to a support collar (42) and hermetically sealed thereto with a sealing glass (40) where each element (2, 28, 32, 42) has a substantially matched coefficient of thermal expansion so as to reduce any induced thermal stresses and resultant measurement errors where the sealing glass (40) and the support collar (42) have a greater coefficient to produce a compressive type seal at high temperature.