Hermetic pressure transducer

摘要

A port fitting is formed with a closed, pedestal end forming a diaphragm on which a strain gauge sensor is mounted. A support member is received on the pedestal end and is formed with a flat end wall having an aperture aligned with the sensor. A portion of a flexible circuit assembly is bonded to the flat end wall with a connector disposed over the support member. A tubular outer housing is fitted over the several components and its bottom portion is welded to the port fitting while its top portion places a selected load on an O-ring received about the connector as well as internal components of the transducer. In one embodiment, a loading washer (72a) is disposed over the O-ring on a first portion (70a) of a two portion connector (70) and retained by a second connector portion (70b). Protrusions (76a1) formed on the tubular housing (76) pass through cut-outs in the second connector portion to place a load on the loading washer. To facilitate assembly, the connector is attachable to the support member in one embodiment by legs of an EMC shield (74), with the shield coupled to the connector by wedging tabs (74c6) and in another embodiment by direct engagement of legs of the connector. In one embodiment a shroud (92) is removably received on the connector to protect elongated terminals extending therefrom. One embodiment is provided with an enhanced environmental seal including a resilient grommet (112) retained by a snap cap (114).