Abstract: A rotary displacement transducer comprises a shaft rotatably supported in a housing, and to which the rotary displacement to be sensed is applied. The shaft is axially fixed in the housing, and has a precision screw thread formed over part of its length. An internally threaded sleeve coaxially surrounds the shaft in threaded engagement with the precision screw thread, the sleeve carrying a collar having two diametrically opposed radial projections. The first projection carries a roller which engages in a slot in the housing to prevent the collar and sleeve rotating as the shaft is rotated, so that rotation of the shaft causes the sleeve and collar to move axially of the shaft by an amount dependent on the rotary displacement to be sensed. The axial movement of the collar is sensed by a linear displacement transducer of the LVDT type coupled to the other radial projection on the collar.

Abstract: A cable outlet adaptor comprises (i) a bush (20) which is threaded over the cable (14) and has a cut-out (30) towards one end; and (ii) a hood (40), having a cap portion (42) and a sleeve portion (44) at a right angle thereto, and split into two sections along a median plane through both portions. The hood can be fitted, even when the cable is already terminated at both ends, by displacing the cable into the cut-out in the bush, placing the cable and bush in one half of the hood and folding the other half over so that the bush extends into the cap portion and the cable emerges from the cut-out into the sleeve portion. A spiral support spring (60) slides over the sleeve portion to hold the two halves together, and pegs (48) in the cap portion engage in holes (32) in the bush to retain the hood on the bush.

Abstract: In a parallel motion finger probe, the parallel motion arm is rigidly connected to a shaft which is supported in a linear ball sleeve bearing, instead of by a parallel motion linkage as in prior finger probes. The parallel motion arm can be biassed in either of its two opposite directions of movement by a leaf spring, whose biassing force and direction can be adjusted by a control wheel having an eccentric groove co-operating with a pin on a spring control arm to which the spring is connected. The leaf spring also serves to prevent rotation of the parallel motion arm about the axis of the bearing. Displacement of the parallel motion arm is sensed by an inductive displacement transducer of the LVDT type.

Abstract: A differential pressure transducer, primarily for measuring gauge pressure, comprises first and second identical, substantially cylindrical, sealed capsule assemblies, each having a circular diaphragm at one axial end. The capsule assemblies are welded into the opposite ends of a cylindrical housing, with the diaphragms facing outwardly. The housing is designed to permit the transducer to be mounted in the wall of a pipe or chamber, with the diaphragm of one capsule subjected to the fluid pressure in the pipe or chamber and the diaphragm of the other capsule subjected to ambient atmospheric pressure. Respective inductive displacement sensors produce respective signals indicative of diaphragm displacement. The use of sealed capsules ensures that if a diaphragm ruptures, fluid loss cannot occur.