Endress + Hauser Flowtec Ag

Endress + Hauser Gmbh + Co. Kg

Jochen Politt

Hartmut Damm

Simon Weidenbruch

Mingzehn Jiang

Alecsandru Nistor

Markus Bühler

A radiometric for measuring a physical, measured variable of a fill substance located in a container and for outputting a measurement signal, which corresponds to a measured value of the physical, measured variable. The measuring device has available a single line-pair, via which energy supply of the total measuring device occurs, and via which transmission of the measurement signal occurs. The measuring device includes: a radioactive radiator, which, during operation, sends radioactive radiation through the container; a detector having a scintillator and a photomultiplier and serving for detecting, and for converting into an electrical output signal, radiation intensity penetrating through the container dependent on the physical, measured variable to be measured; a measuring device electronics, which serves, on the basis of the electrical output signal of the detector, for producing the measurement signal and for making such available via the line-pair; an energy storer supplied via the line-pair; a controller, which, as a function of energy available via the line-pair and the energy storer, triggers measuring phases, during which the measuring device measures the physical, measured variable, and which places the photomultiplier in operation exclusively during the measuring phases, wherein high voltages required for operating the photomultiplier are produced during the measuring phases by means of a high voltage cascade.

Radiometric measuring device

A radiometric measuring arrangement for measuring fill level of a fill substance in a container includes: arranged one above the other in measurement operation on a first side of the container, two or more radiometric radiators, which, in measurement operation, send radioactive radiation through the container, and which, in measurement operation, are arranged in a measuring position in the interior of the container in a pressure resistant, protective tube protruding laterally into the container; and, arranged on a second side of the container lying opposite to the radiators, at least one detector, which serves to receive radiation intensity penetrating through the container as a function of fill level and to convert such into a fill level dependent, electrical signal. The measuring arrangement permits achievement of a highly linear dependence of total detected radiation intensity on fill level. At least in protective tubes, above which at least one further radiator is located, above the radiator of such a protective tube, an absorber is arranged, which serves to absorb radiometric radiation upwardly radiated by the radiator of such protective tube, when such radiator is located in the measuring position.

Radiometric fill level measuring arrangement

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Rheinfelden, Germany

Jochen Politt