Abstract: The RAD transducer comprises a sensor (1) for measuring physical quantities, a power supply section (7), a clock section (2), a timing section (4,5) and a circuitry for the acquisition of a measurement and its frequency conversion for transmission. This acquisition circuitry includes a microcontroller (11), a memory (14) containing compensation parameters used in a calibrating process an analogue/digital converter (13) for converting analogue measurement delivered by the main sensor (1) in a digital form adapted to be processed by the microcontroller (11), a temperature sensor (15) converting a temperature value into a voltage value, an analogue/digital converter (16) for converting the analogue measurement given by the temperature sensor (15) into a digital form adapted to be processed by the microcontroller (11), and frequency generating meads (17) for generating the signal to be transmitted on the line through the power supply section.

Abstract: A single/multiple transducer for measuring physical quantities and variables includes a multiplexer unit for selecting the sensors of physical quantities and electric variables by the decoding of an address, thereby permitting a single power supply, a single counter and a single clock generator to be used in order to enable a plurality of sensors placed in a plurality of locations and to transmit the measurements thereof, each of said sensors detecting its own physical quantity or electric variable.

Abstract: A pressure transducer includes a multiplexer unit for the selection of pressure sensors by decoding a sensor address, thereby permitting a single power supply, a single counter and a single clock generator to be used, in order to enable and transmit the measurements of a plurality of pressure sensors connected to a plurality of gas-filled cables.