PROBLEM TO BE SOLVED: To provide a capacitance type level sensor which is easy to adjustMEANS: A counter 20 counts a high-frequency clock and divides its frequency and outputs a rectangular oscillation signal The capacitance or inductance of a resonance circuit 26 changes in a state where there is an object 28 and in a state where there is no object, causing its resonance frequency to change The frequency dividing number of the counter is gradually changed by frequency setting means 22 and the frequency of the rectangular oscillation signal is swept The frequency setting means 22 acquires the amplitude of a detection signal when the frequency of the rectangular oscillation signal is changed The rectangular oscillation signal is set to a frequency at which the amplitude is largest (or smallest) In this way, the frequency of the rectangular oscillation signal and the resonance frequency of the resonance circuit are automatically made to matchSELECTED DRAWING: Figure 1

Object detection sensor

The invention relates to an impedance sensor which is provided with components of a probe (102) which can be influenced in a capacity by a medium surrounding the probe (102); a measuring oscillation circuit in which the probe (102) is arranged as a capacity-determining element; an electronics unit (406, 606) with a signal generator (402, 602) for excitation of the measuring oscillation circuit anda signal detector (104) for determining a response signal of the measurement oscillation circuit and a signal processing unit (401, 601) connected with the electronics unit (406, 606) characterized in that the signal generator (402, 602) is designed as a digital controllable circuit.

Impedance sensor and method for its operation

Vorrichtung zur Uberwachung zumindest einer physikalischen oder chemischen Prozessgrose eines Mediums (2) in einem Behalter (3) mit zumindest einer im kapazitiven Messmodus betriebenen Messsonde (1) und einer Elektronikeinheit (7), wobei die Elektronikeinheit (7) dazu ausgestaltet ist, die Messsonde (1) mit einem einstellbaren Anregesignal zu beaufschlagen, wobei innerhalb der Elektronikeinheit (7) eine Messschaltung (8) vorgesehen ist, welche dazu ausgestaltet ist, das von der Messsonde (1) erhaltene Antwortsignal unabhangig von der Frequenz des Anregesignals in ein Antwortsignal einer vorgegebenen Frequenz zu transformieren, wobei eine Auswerteeinheit (16) vorgesehen ist, die dazu ausgestaltet ist, die Prozessgrose aus dem von der Messsonde(1) erhaltenen transformierten Antwortsignal zu ermitteln.

Vorrichtung und Verfahren zur Überwachung einer Prozessgröße eines Mediums

A capacitive sensor assembly for determining a fluid level within a fluid reservoir sensing through impedance change due to capacitive element driven by radio frequency differential voltage source. The chip is supplied with a pair of voltage sources having opposite phases and similar magnitude, a resultant capacitance changes being represented as a changing voltage output via a capacitive voltage divider arrangement. A feedback loop with an LC circuit is also applied to the received voltages maintains the same value to compensate for measuring different fluid with the same sensor configuration or aging/acidization changes in the dielectric constant of the oil as it ages.

Capacitive fluid level sensor for rapid response

The invention relates to a highly reliable water level detecting method for a self-vibration motor home water tank. In the circular charge-discharge process, high frequency pumping pulses are automatically stacked on an emitting electrode, the frequency of the stacked high frequency pumping pulses is close to the self-vibration frequency of a metal electrode when water is in the water tank and away from the self-vibration frequency of the metal electrode when no water is in the water tank. The metal electrode is forced to reach an optimal self-vibration frequency point, thereby reducing the integrated impedance of a circuit and improving the detecting sensitivity.

Highly reliable water level detecting method for self-vibration motor home water tank

Verfahren zur Uberwachung eines vorgegebenen Fullstandes eines Mediums (3) in einem Behalter (2) mit zumindest einer Messsonde (1) und einer Elektronikeinheit (7), wobei die Messsonde (1) abwechselnd im konduktiven und im kapazitiven Betriebsmodus betrieben wird, wobei die Messsonde (1) mit einem Erregersignal beaufschlagt wird, welches Erregersignal aus zwei verschiedenen zeitlich abwechselnd aufeinanderfolgenden periodischen Teilsignalen zusammengesetzt wird, wobei in einem ersten Zeitintervall das erste periodische Teilsignal fur den konduktiven Betriebsmodus und in einem zweiten Zeitintervall das zweite periodische Teilsignal fur den kapazitiven Betriebsmodus generiert wird, wobei aus dem von der Messsonde (1) erhaltenen vom aktuellen Teilsignal abhangigen Antwortsignal gemas des kapazitiven oder konduktiven Betriebsmodus ermittelt wird, ob der vorgegebene Fullstand erreicht ist, und wobei eine Meldung bei Uber- oder Unterschreiten dieses Fullstandes generiert wird.

Verfahren und Vorrichtung zur Überwachung des Füllstandes eines Mediums in einem Behälter

Die Erfindung betrifft einen Signalgenerator zur Erzeugung periodischer Signale fur eine Messvorrichtung (1) der Automatisierungstechnik, wobei die Signale aufeinanderfolgende, diskrete Signalfrequenzen aufweisen, die innerhalb eines vorgegebenen Frequenzbereichs liegen, mit einer Steuer- und/oder Recheneinheit (4), mit einem Taktgeber (6), wobei der Taktgeber (6) eine konstante Abtastfrequenz zur Verfugung stellt, die groser ist als die maximale diskrete Signalfrequenz in dem vorgegebenen Frequenzbereich, mit einer Speichereinheit (7), in der zu jeder der diskreten Signalfrequenzen die Amplitudenwerte der entsprechenden periodischen Signale in Abhangigkeit von der Abtastfrequenz gespeichert oder speicherbar sind, wobei die Steuer- und/oder Recheneinheit (4) die gespeicherten oder speicherbaren Amplitudenwerte der diskreten Frequenzen sukzessive mit der Abtastfrequenz des Taktgebers (6) aus der Speichereinheit (7) ausliest und die periodischen Signale erzeugt oder zur Erzeugung weiter reicht, und mit einer statischen Filtereinheit (12) mit einer Grenzfrequenz, die uber der maximalen Signalfrequenz liegt und die die durch die Abtastung verursachten Frequenzanteile entfernt.

Signalgenerator für eine Messvorrichtung und Messvorrichtung für die Automatisierungstechnik

The invention relates to a signal generator for producing periodic signals for a measuring apparatus ( 1 ) of automation technology, wherein the signals have sequential, discrete signal frequencies, which lie within a predetermined frequency range, a control- and/or computing unit ( 4 ), a clock signal producer ( 6 ), wherein the clock signal producer ( 6 ) provides a constant sampling frequency, which is greater than the maximum discrete signal frequency in the predetermined frequency range, a memory unit ( 7 ), in which for each of the discrete signal frequencies the amplitude values of the corresponding periodic signals are stored or storable as a function of the sampling frequency, wherein the control- and/or computing unit ( 4 ) reads out the stored or storable amplitude values of the discrete frequencies successively with the sampling frequency of the clock ( 6 ) from the memory unit ( 7 ) and produces the periodic signals or forwards for producing, and a static filter unit ( 12 ) with a limit frequency, which lies above the maximum signal frequency and which removes frequency fractions caused by the sampling.

Signal generator for a measuring apparatus and measuring apparatus for automation technology

A method for monitoring a predetermined filling level of a medium (3) in a container (2) with at least one measuring probe (1) and an electronic unit (7), wherein the measuring probe (1) is operated alternately in the conductive and in the capacitive operating mode, wherein the measuring probe (1) is subjected to an excitation signal, which excitation signal is composed of two different, temporally alternately consecutive periodic partial signals, wherein the first periodic partial signal for the conductive operating mode is generated in a first time interval and the second periodic partial signal for the capacitive operating mode is generated in a second time interval, wherein it is determined from the response signal, which is obtained by the measuring probe (1) and is dependent on the current partial signal, in accordance with the capacitive or conductive operating mode, whether the predetermined filling level has been reached, and a message is generated if the filling level exceeds or falls short of said filling level.

Method and device for monitoring the filling level of a medium in a container

Vorrichtung (1) zur kapazitiven Bestimmung und/oder Uberwachung zumindest einer Prozessgrose eines Mediums (4) in einem Behalter (3), umfassend zumindest eine Sensoreinheit (2) mit zumindest einer Sensorelektrode (5), ein Gehause (8) und eine Elektronikeinheit (7), wobei die Elektronikeinheit (7) dazu ausgestaltet ist, – die Sensoreinheit (2) mit einem hochfrequenten Anregesignal zu beaufschlagen, – von der Sensoreinheit (2) ein Antwortsignal zu empfangen, und – zumindest aus dem Antwortsignal eine Aussage uber den Fullstand des Mediums (4) in dem Behalter (3) zu treffen. Die Vorrichtung (1) umfasst ferner ein Koppelelement (11), welches derart angeordnet und dazu ausgestaltet ist, zumindest zeitweise eine leitfahige Verbindung zwischen zumindest einem Teilbereich des Gehauses (8a) und zumindest einer Komponente (7b) der Elektronikeinheit (7) herzustellen und zumindest zeitweise eine kapazitive Kopplung zwischen den beiden Komponenten zu bewirken.

Koppelelement für ein kapazitives Füllstandsmessgerät

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