Device for determining and/or monitoring at least one predetermined fill level
A technology for filling liquid level and liquid, which is used in measuring devices, lubrication indicating devices, liquid level indicators for physical variable measurement, etc.
Active Publication Date: 2013-05-01
EHNDRESS KHAUZER GMBKH KO KG
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Problems solved by technology
Therefore, it is not possible to retroactively reconfigure a level measuring device with a conventional transducer unit
Method used
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Embodiment Construction
[0033] exist figure 1 An example of a sensor unit 2 is described in , which can be a constituent part of a prior art fill level measuring device as well as a fill level measuring device according to the invention. Here, the oscillating unit 23 takes the form of a fork with two teeth 232 , wherein the teeth 232 are arranged on the membrane 231 . By way of example, the membrane 231 forms a seal of the tubular housing in which the transmitter / receiver unit is arranged. Here, the transmitter / receiver unit consists of a plurality of piezoelectric elements arranged in a stack. The two piezoelectric elements on the inside form a transmitter unit 25 which excites the oscillating mechanical unit 23 to oscillate. The two outer elements act as receiver unit 24 and generate an electrical reception signal E from the received mechanical oscillations. Each of the piezoelectric elements of the transmitter unit 25 and the receiver unit 24 comprises two electrodes, which are arranged on oppo...
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The invention relates to a device for determining a predetermined fill level of a liquid in a container, having a sensor unit, comprising a unit capable of mechanical oscillations, a transmitter and a receiver, which is mechanically and electrically coupled to the transmitter and which converts the oscillations of the unit capable of oscillations into an electrical received signal, and further having an electronic unit comprising a control unit, which regulates a phase difference that exists between the transmitted signal and the received signal to a certain value, wherein the unit capable of oscillations performs oscillations having a resonant frequency, and which forms an oscillating circuit together with the transmitter, the receiver and the unit capable of oscillations. According to the invention, the electronic unit has a compensation unit which at least at intervals generates a compensation signal from the transmitted signal in order to compensate for additional signal portions in the received signal which result from the coupling between the transmitter unit and receiver unit, and supplies said compensation signal to the received signal, wherein the compensation unit generates the compensation signal such that the compensation signal is counter to the additional signal portions in the received signal.
Description
technical field [0001] The invention relates to a device for determining and / or monitoring at least one predetermined fill level of a liquid in a container, which has a sensor unit comprising at least [0002] a mechanically oscillating unit which can be arranged at the height of a predetermined fill level, [0003] a transmitter unit which excites the oscillatable unit to mechanically oscillate by electrically transmitting a signal, [0004] and a receiver unit which is electrically and mechanically coupled to the transmitter unit and which converts the oscillation of the oscillatable unit into an electrical receive signal, [0005] and having an electronic unit, comprising at least an evaluation unit, which determines from an electrical signal whether the oscillating unit is covered or uncovered by liquid, [0006] and an adjustment unit that adjusts the phase difference existing between the electrical transmission signal and the electrical reception signal to a predetermi...
Claims
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IPC IPC(8): G01F23/296
CPCG01F23/2967G01F23/22G01F23/2966
Inventor 萨沙·德安热利科谢尔盖·洛帕京佛朗哥·费拉多
Owner EHNDRESS KHAUZER GMBKH KO KG