Abstract: A level measuring instrument has a variable transmitting power for measuring a filling level in a tank. The level measuring instrument includes a generator unit generating one of a first oscillator signal and a second oscillator signal. The generator unit generates a transmit signal from one of the first oscillator signal and the second oscillator signal. The level measuring instrument includes further a controller controlling the generator unit. The generator unit generates one of first and second transmitting powers for the transmit signal.

Abstract: An antenna for a fill level radar includes a high-temperature process separation device and an attenuation element. The attenuation element is used to improve the measuring signal in the near zone of the antenna and is affixed to the process separation device or in the process separation device. In this way antenna ringing may be significantly reduced.

Abstract: A waveguide transition for a fill level radar may include a printed circuit board in which a resonator is integrated. Together with a coupling element, the resonator is used for decoupling high-frequency waves from a feed line, that is also integrated in the printed circuit board, to a waveguide that is screwed onto the printed circuit board. There is thus no need to provide an external resonator.

Abstract: For safety reasons the potential of an electrical supply line of a radar sensor should be separate from the potential of the filling level container. An arrangement for potential separation for a filling level radar is provided, which arrangement comprises a separation element for insulating the waveguide from the antenna. The separation element, corresponding to the cross section of the waveguide, is ring shaped. In this way rotatability between the sensor housing and the antenna subassembly is provided without influencing the signal line between the antenna and the waveguide.

Abstract: Described is a planar antenna with a process separation device for a fill level radar. The planar antenna including a plate-shaped temperature-resistant process separation device that is arranged between the planar radiator element and the exterior of the antenna.

Abstract: In fill-level measuring devices according to the pulse-transit-time method, a reflection that is generated internally in a microwave module is used as a reference for transit time measuring. For generating the reference pulse, the microwave module comprises its own sampling mixer or its own oscillator. Subsequently, the echo signal and the reference pulse can be further processed separately or together. No delay line is necessary on the transmission frequency of the radar sensor. Interference as a result of leakage signals is largely prevented.

Abstract: A high-frequency module is for fill level measuring and for use at frequencies of more than 75 GHz. The high-frequency module comprises a microwave semiconductor, a printed circuit board and a housing bonded to the printed circuit board. In order to reduce the power required, operation of the microwave semiconductor takes place in a pulsed manner.

Abstract: The transmission power of a fill level radar is varied in that the transmission power is switched, by a signal switch, from a first transmission power to a second transmission power. This switching takes place, for example, by bypassing the high-frequency amplifier or by switching off a drain voltage.

Abstract: For safety reasons the potential of an electrical supply line of a radar sensor may be separated from the potential of the fill level container. A fill level radar with potential separation includes a separation element for insulating the aerial from a feed device. The separation element is arranged directly at the aerial, or forms part of the aerial. In this way insulation of the aerial from the exterior of the container is provided.

Abstract: The shape or amplitude of reference pulses in a filling level radar typically depend on the component quality of the circulator used, of a transmitting/receiving coupler, or else of the circuit temperature. In case of large echoes at close range, the quality of the measurement may deteriorate. A radar module for extracting a reference signal for a filling level radar comprises a tap extracting the reference signal and a delay line delaying the transmit signal. Delaying the transmit signal on its way to the antenna takes place after the extraction of the leakage pulse.

Abstract: A frequency converter for a filling level radar includes a signal generator unit, a receiver circuit, a transmit coupler, and an amplifier. The amplifier is amplifying the transmit signal at the high frequency side of the frequency converter. For frequency conversion, a mixer or a multiplier may be provided.

Abstract: A conductor leadthrough for a field device is for connecting two electrical conductors. The conductor leadthrough comprises an external conductor and a sealing apparatus. The sealing apparatus is divided into a first separation device and a second separation device. The external conductor comprises a hollow internal region that extends along a longitudinal axis of the external conductor. The first separation device and the second separation device are arranged along the longitudinal axis of the external conductor so as to be spaced apart so that they can separate a section of the hollow internal region of the external conductor. A pourable-sealing device is filled into the separated section of the hollow internal region of the external conductor so that the sealing apparatus can provide a leakage rate whose value is below a predeterminable value of a leakage rate. A signal of a predeterminable frequency can be transmitted along the longitudinal axis.

Abstract: A filling level sensor for a short distance measurement includes a first antenna transmitting a transmission signal to a material surface; a second antenna receiving a reception signal reflected by the material surface; and a common outer enclosure enclosing the first antenna and the second antenna.

Abstract: A level measuring instrument has a variable transmitting power for measuring a filling level in a tank. The level measuring instrument includes a generator unit selectively generating different transmitting powers. The generator unit is controlled so that the transmitting power is respectively adapted to the corresponding environmental conditions. For this purpose, the generator unit has for instance two different oscillators, which are driven selectively.

Abstract: An antenna for a fill level radar includes a high-temperature process separation device and an attenuation element. The attenuation element is used to improve the measuring signal in the near zone of the antenna and is affixed to the process separation device or in the process separation device. In this way antenna ringing may be significantly reduced.

Abstract: A level measuring instrument has a variable transmitting power for measuring a filling level in a tank. The level measuring instrument includes a generator unit selectively generating different transmitting powers. The generator unit is controlled so that the transmitting power is respectively adapted to the corresponding environmental conditions. For this purpose, the generator unit has for instance two different oscillators, which are driven selectively.

Abstract: In fill-level measuring devices according to the pulse-transit-time method, a reflection that is generated internally in a microwave module is used as a reference for transit time measuring. For generating the reference pulse, the microwave module comprises its own sampling mixer or its own oscillator. Subsequently, the echo signal and the reference pulse can be further processed separately or together. No delay line is necessary on the transmission frequency of the radar sensor. Interference as a result of leakage signals is largely prevented.

Abstract: A frequency converter for a filling level radar includes a signal generator unit, a receiver circuit, a transmit coupler, and an amplifier. The amplifier is amplifying the transmit signal at the high frequency side of the frequency converter. For frequency conversion, a mixer or a multiplier may be provided.

Abstract: Described is a planar antenna with a process separation device for a fill level radar. The planar antenna including a plate-shaped temperature-resistant process separation device that is arranged between the planar radiator element and the exterior of the antenna.

Abstract: A waveguide transition for a filling level radar is provided, which has a planar emitting element, which cooperates with two lines, such that circularly polarized electromagnetic transmitting signals can be coupled from the lines into a waveguide. With the thus-existing planar coupling, the necessity for an additional resonance chamber in the area of the coupling may be eliminated.