Abstract: In order to detect relative linear displacements between two members, the transducer includes a fixed part or stator connectible to one of the members and a movable part or rotor rotatably supported by the fixed part. A flexible traction member has one end anchored to the other member and its other end connected to the rotor in such a way as to cause rotation of the latter in one sense relative to the stator when the members move away from each other. The transducer also includes a return spring which tends to rotate the rotor in the opposite sense of rotation when the two members move towards each other. Electrical sensor means output electrical signals indicative of the angular position of the rotor relative to the stator and hence of the relative position of the two members.

Abstract: A device for monitoring the pressure of fluid in an electrically conductive duct, such as an injection duct of a diesel engine, includes at least one electrical pressure transducer connectible mechanically and electrically to the outer surface of the duct, and support means for keeping the transducer in connection with the duct. A rigid casing for surrounding and protecting the support means and the transducer is formed in two parts which are hinged together so as to clamp the transducer to the duct. This casing is constituted at least in part by an electrically conductive material and has an internal electrical connection with the output of the transducer, whereby signals output by the transducer in operation can be picked up directly by the casing.