Device for detectomg a level

Abstract

The invention relates to a device (1) for detecting a level (3) of media (4), preferably in a tank (2, 200), having an elongated electrical probe conductor (6) extending substantially vertically into the tank (2, 200) and mountable such that said conductor is electrically insulated therefrom, a time-variable electric generator (7) having an internal impedance (Zg) for connection to a feed point (11) of the probe conductor (6), in order to apply a time-variable voltage thereto, wherein the feed point (11) is arranged at one end of the probe conductor (6), in particular at the tank end thereof, and an evaluating and / or control unit (9) for evaluating an electrical variable of the probe conductor (6). In order to enable such a device to detect a level of any medium, in particular liquid, paste-like and / or granulated solid media, in a manner as simple, fault-tolerant and cost-effective as possible, according to the invention the evaluating and / or control unit (9) is designed to measure a foot point impedance of the probe conductor (6) at the feed point (11).

Description

technical field [0001] The invention relates to a device for detecting the level of a medium preferably in a tank, the device having: a long electrical probe conductor extending substantially vertically into the tank and mounted electrically insulated relative to the tank; An electrical generator having an internal impedance (Zg) for connecting the feed point of the probe conductor in order to provide a time-varying voltage at the feed point, where the feed point is preferably arranged at the probe conductor on the end on one side of the box; and an analysis and / or control unit to analyze the electrical value of the probe conductors. [0002] Furthermore, the invention relates to a method for operating a device as claimed in any one of claims 1 to 13 for measuring level heights. [0003] The invention also relates to a method for calibrating a device as claimed in claims 1 to 13, in particular according to variations of the probe conductor. [0004] Finally, the invention re...

AI Technical Summary

Problems solved by technology

Problems can also arise in capacitive measuring probes, which often fail when foam forms

Furthermore, in such probes, the disadvantage is that the insulating layer increases the manufacturing cost and suffers from diffusion effect problems, especially when used at high temperature

[0008] In addition, run-time methods are known, such as pulse-run time measurement, time-domain reflectometry (TOR), guided radar echo methods, which, although not necessarily requiring electrical insulation of the probe conductor, have the disadvantage that when laying Relatively expensive for control and analysis circuits in the very high frequency range

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