Abstract: The sensor comprises a body defining a closed chamber which is partially filled with electrically conductive liquid. A main electrode and first and second auxiliary electrodes extend within the chamber in such a way that a variation in the inclination of the body from a predetermined position causes a corresponding variation in the electrical resistance between each auxiliary electrode and the main electrode. The monitoring circuit for the sensor comprises a generator which applies square-wave signals to the auxiliary electrodes in counterphase, and a detector/amplifier which is synchronized with the generator and samples the signal taken from the main electrode in the sensor.

Abstract: A strain gauge sensor for sensing stresses and deformations in mechanical members or structures, comprising a support substrate in form of a thin plate, made of an electrically-insulating material, preferably ceramic material, bearing on one face at least one thick-film resistor; said support substrate being adapted to be firmly attached with its other face onto a member or structure of which stresses and deformations are to be locally sensed, so that said stresses or deformations determine through the substrate corresponding deformations of said at least one thick-film resistor.

Abstract: The sensor includes a rigid support and a diaphragm having a peripheral portion fixed by a layer of glue to the support. The central portion of the diaphragm is spaced from the support and, on its surface facing the support, carries at least one thick-film resistor acting as a piezo-resistive transducer. The diaphragm can deform resiliently towards the support when a pressure is exerted on its other surface. The surface of the support which is connected to the diaphragm is flat, and the layer of glue has a calibrated thickness such that the distance between the diaphragm and the surface of the support at rest is substantially equal to the deflection of the diaphragm corresponding to a predetermined maximum pressure measured.

Abstract: An electrical sensor device, particularly a pressure sensor device, comprises at least one pressure transducer, particularly a thick-film transducer, connected to a monitoring circuit arranged to output an electrical signal which is variable in dependence on the pressure, an interface circuit connected to the monitoring circuit and arranged, in response to the said signal, to present an output resistance which increases or decreases in accordance with a predetermined response curve, on increase in the pressure detected by the transducers.

Abstract: A pressure measuring device comprises a support casing having an aperture, a substrate mounted in the casing and deformable through the effect of a pressure to be measured introduced into the casing through the aperture, at least one electrical deformation sensor, preferably a thick-film resistor, applied to the substrate, circuit means housed in the casing and connected to the at least one electrical deformation sensor for outputting electrical signals indicative, according to a predetermined response curve, of the deformations of the substrate and hence of the pressure acting thereon, and manually-operable electrical adjustment means mounted in the casing and connected to the circuit means, for modifying predetermined characteristics of the response curve.

Abstract: In a system for recharging electric accumulators, including a polyphase alternator connected to a rectifier circuit, and a voltage regulator circuit connected to the rectifier circuit and the field winding of the alternator, there is connected a circuit for detecting and indicating faults and operating anomalies. This circuit includes a signal processor circuit which is connected to the armature winding of the alternator and is operable to provide an output test signal substantially proportional to the mean value of the signal appearing, in operation, at the actual or virtual star point of the phases of the armature winding of the alternator. Generator means provide first and second predetermined reference output signals. A comparison circuit activates alarm signalling means when the test signal falls below the first reference signal, and when the test signal exceeds the second reference signal.