Krohne S.a.

Krohne Ag

Achim Bletz

Thomas Musch

Joseph Neven

Alexandre Thollet

A radar fill-level sensing device has a high-frequency unit that serves to generate and process radar signals of a predefined frequency and wavelength, an antenna for transmitting and/or receiving the radar signals, as well as circuitry, provided on a circuit board. That circuitry includes a microstrip circuit for connecting the high-frequency unit to the antenna, that microstrip circuit featuring a ground conductor. The ground conductor encompasses a first segment, a radial stub and a second segment, the length of the first segment corresponding essentially to one quarter of the predefined wavelength. The radial stub is positioned at the end of the first segment, the second segment connects to the end of the first segment and to the radial stub, and the second segment is grounded. Based on this design, a radar fill-level sensing device is obtained that can easily and reproducibly be implemented within the requirements of 'intrinsically safe' ignition protection.

Radar fill-level sensing device

A fill-level detector operating by the radar principle gauges the fill-level of the lower of two substances layered one atop the other in a container. The detector incorporates first and second essentially straight, parallel electrical conductors having a signal generator and a transducer mounted to the upper ends of the conductors with the lower ends of the conductors protruding into the lower substance. The generator delivers a signal to the first conductor which signal is conducted into the lower substance with a portion of that signal being reflected at the interface of the two substances which signal portion is captured by the transducer. The detector is able to determine to fill level of the lower substance even when the upper substance displays a high dielectric constant.

Fill-level detector

An arrangement for generating a first alternating signal and a second alternating signal that is in a predetermined, fixed frequency relation to the first signal. The arrangement may be used as a time based generator for a level meter that operates according to the radar principle and whose measuring system is based on the time domain reflectometry (TDR) measuring principle.

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Tournon sur Rhone, France

Achim Bletz