Patent ID: 8487262

Claim:
A radiometric measuring device for measuring a physical, measured variable of a fill substance located in a container and for outputting a measurement signal corresponding to a measured value of the physical, measured variable, wherein the device has available a single line-pair, via which energy supply of the total measuring device occurs, and via which transmission of measurement signals occurs, the device, comprises: 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 for producing the measurement signal on the basis of the electrical output signal of said detector and for making the measurement signal available via said line-pair; an energy storer supplied with energy via said line-pair; a high voltage cascade produces a high voltage required for operating said photomultiplier during the measuring phases; a controller, which measure the total energy available via said line-pair and said energy storer on the basis of electrical current and voltage of the effective entering energy via said line-pair and the charging and discharging, characteristic curves of the energy storer, which triggers a measuring phase, as a function of said total energy available via the line-pair and said energy storer, during which the measuring device measures the physical, measured variable over said measuring phase, and which operates said photomultiplier and said high voltage cascade and switched off said high voltage cascade and therewith also the photomultiplier during measuring pauses and consumes no energy.