Method for determining and/or monitoring at least one physical process parameter
A technique of physical process and variance, applied in the direction of liquid/fluid solid measurement, measurement device, engine lubrication, etc., can solve problems such as influence
Active Publication Date: 2014-07-23
EHNDRESS KHAUZER GMBKH KO KG
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Problems solved by technology
The disadvantage of this method is that the limit value has to be determined anew for each medium and that variable factors such as temperature influence the limit value
Furthermore, in the case of applying the device to detect the maximum filling level, the limit value is not exceeded when the medium rises and covers the oscillatable unit, so that in the case of gradual covering, without other measures, because the medium has been elevated so it is difficult to discern between attached and covered
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[0036] figure 1 The received signal recorded with a membrane oscillator in the case of exciting the membrane with a frequency sweep is shown. A phase selective signal is also provided. This is obtained when the received signal is sampled only at specific points in time to determine an oscillation frequency at which there is a predetermined phase shift between the transmitted and received signals, where the specific points in time are chosen such that when There is a predetermined phase shift between the signals When , extrema and / or zero intercepts in the received signal are detected and evaluated appropriately. It can be seen that modulation occurs in the unchanged received signal and also in the phase selective signal. The presence in both signals means that a predetermined phase shift also occurs during modulation
[0037] Modulation occurs through the superposition of various frequencies. Although the excitation is discrete, frequency superposition is still possibl...
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The invention relates to a method for determining and / or monitoring at least one physical process parameter of a medium with a vibratable unit, wherein the transmitting / receiving unit excites the vibratable unit by means of a transmitting signal to perform a vibration, wherein the vibratable unit The vibrations are received in the form of a received signal and wherein a process parameter is determined and / or monitored based on the frequency and / or amplitude of the received signal and / or the phase shift between the transmitted signal and the received signal. The invention is further characterized in that the temporal behavior of the amplitude of the received signal is checked and evaluated from the temporal variation of the excitation of the vibratable unit and thus it is determined whether deposits have formed on the vibratable unit.
Description
technical field [0001] The invention relates to a method for determining and / or monitoring at least one physical process variable of a medium with an oscillatable unit, wherein a transmitting / receiving unit excites the oscillatable unit by means of a transmitting signal to perform an oscillation, wherein the oscillatable unit The oscillation of is received in the form of a received signal, and wherein the process variable is determined and / or monitored based on the frequency and / or amplitude of the received signal and / or the phase shift between the transmitted signal and the received signal. Background technique [0002] Process variables are, for example, the fill level of the medium in the container, the density or the viscosity of the liquid. Devices for determining or monitoring process variables are electro-oscillometric measuring devices, wherein the oscillatable unit is preferably realized as a membrane, an oscillatory fork or a single rod. [0003] The main use of e...
Claims
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IPC IPC(8): G01F23/296
CPCG01F25/0061G01F23/2965G01F23/296G01F23/2966G01F25/20
Inventor 马丁·乌尔班
Owner EHNDRESS KHAUZER GMBKH KO KG