Snamprogetti S.p.a.

Virgilio Arrigoni

Bruno Gaetani

Pietro Ghezzi

Dario Ercolani

Afro Manotti

Francesco Ferrini

An electric device is disclosed which is intended to detect and to signal the beginning of the settling of the solid phase of a solid-in-liquid suspension of a particulate, said suspension flowing in a duct for long-distance conveying of said particulate. The device essentially comprises a set of polarizing electrodes and a set of detecting electrodes. The signals delivered by the device are properly displayed after processing and characteristic patterns of the suspension flow can be viewed on an oscilloscope or, if desired, graphically recorded.

Device for detecting the initial settling of the solid phase in

A system for automatically suppressing any ground noise present in the detection of periodic phenomena comprising detecting means for detecting the signal occurring just prior to the occurrence of the periodic phenomena, which signal is representative of ground noise, converting means for converting the sensed signal to a usable D.C. level signal, sampling means for sampling the signal resulting from the occurrence of the periodic phenomena, and summation means for algebraically adding the converted D.C. signal to the sampled signal for eliminating any ground noise present in the sampled signal, thereby providing an output signal representative of the periodic output phenomena free of any ground noise.

Automatic system for suppressing the ground noise of apparatus for

A system is disclosed through which knocking in an internal combustion engine is quantitatively measured by detecting engine vibrations with an accelerometer, transmitting the accelerometer signal to an elaboration network including an amplifier and a filter, transmitting an ignition pulse to a control network, transmitting the output from the elaboration network through a gate only during coincidence of a signal from the control network, the output of the control network corresponding to the angle of revolution of the crankshaft during which knocking usually occurs, and detecting the output signal from the gate.

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San Donato Milanese, Italy

Virgilio Arrigoni