Abstract: A polyimide adhesive is applied in liquid form between surfaces of a pressure transducer glass surface and a glass pedestal tube and maintained at room temperature, or below, for a period of 10-15 hours to allow the adhesive solvent to evaporate. After such time, the temperature of the transducer and attached pedestal tube is elevated over a period of time to about 320.degree. C. to completely imidize the polyimide adhesive. The pedestal is then fixed within an opening in a base portion of a case, and electrical conductors are connected between pins in the case and transducer contacts. A cover is hermetically sealed to the case to thereby encase the transducer.

Abstract: A generally cylindrical plug is adapted for a snug fit in a socket bore communicating with the inlet of a pressure gauge. The plug includes an upstream portion and an axially contiguous downstream portion, each cooperating with the surrounding surface of the socket bore to define a continuous flow path communicating inward to the sensing unit of the gauge. Through the upstream portion, the flow path is annular in cross-section between the plug surface and the bore surface while the downstream portion defines a helical flow path communicating with the open bore downstream thereof. Dimensionally critical in the relationship of the flow path defined in the upstream portion, versus the flow path defined in the downstream portion is the requirement that the former have a clearance dimension relatively smaller than the minimum clearance dimension through the cross-section of the latter.

Abstract: An elongated actuator pin in a pressure gauge extends from a fixed end to a free end to interact with the amplifier for enabling pivotal motion thereof to translate Bourdon displacement to an output pointer. A clamp slideably mounted on the actuator pin is operatively effective when set at a selected location along the pin length to variably offset the free end of the pin from its longitudinal axis for obtaining correct calibration adjustment of the gauge.