Hermetic pressure transducer with internal spring contacts

摘要

A port fitting (102) is formed with a closed, pedestal end forming a diaphragm (102a) on which a strain gauge sensor is mounted. A support member (106) is received on the pedestal end and is formed with a flat end wall (106a) having an aperture (106d) aligned with the sensor. A circuit assembly (108) is bonded to the flat end wall and the sensor wire bonded to the electronic circuit. A cover member (114) placed on the support member, is provided with a cavity for a metal shield member (118) fitted inside the cover member before assembly. The shield member is formed with spring members (118b) extending outside the perimeter of the cover member. The cover member is formed with circular cavities (114d) extending in an axial direction to provide seating for contact spring members (117), making electronic contact to the sensor electronics and protruding beyond the body of the cover member. The cover member is also fitted with a circular elastomer gasket member (116), providing an environmental seal. A connector member (120e), comprised of an integrally formed metal housing member (120a) and bent terminals (122a, 122b, 122c), is then placed over the cover member in such a manner that the terminals are aligned with the spring contact members, making electrical contact with the spring members. The bottom portion (120b) of the metal housing is welded to a support flange (104) of the port fitting while its top portion (120a) places a selected load on the elastomer seal member seated on the cover member of the transducer. <IMAGE>