DE10021061B4 - probe - Google Patents
probe Download PDFInfo
- Publication number
- DE10021061B4 DE10021061B4 DE2000121061 DE10021061A DE10021061B4 DE 10021061 B4 DE10021061 B4 DE 10021061B4 DE 2000121061 DE2000121061 DE 2000121061 DE 10021061 A DE10021061 A DE 10021061A DE 10021061 B4 DE10021061 B4 DE 10021061B4
- Authority
- DE
- Germany
- Prior art keywords
- frequency oscillator
- sensor
- cable
- connecting line
- oscillator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000523 sample Substances 0.000 title description 5
- 230000010355 oscillation Effects 0.000 claims abstract description 10
- 238000011156 evaluation Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/261—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields for discrete levels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/265—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Messfühler mit
– einem
Befestigungsteil (1),
– einem
Fühlerteil
(2),
– einem
in dem Fühlerteil
(2) angeordneten Sensorelement (3),
– einer das Sensorelement (3)
an den invertierenden Eingang (14) eines Hochfrequenzoszillators
(11) anschließenden
ersten Anschlussleitung (4),
– einer mit dem Ausgang (15)
des Hochfrequenzoszillators (11) verbundenen Kabelabschirmung (5)
und
– einer
zweiten Anschlussleitung (7), die an ihrem einen Ende im Bereich
des Sensorelements (3) mit der Kabelabschirmung (5) und an ihrem
anderen Ende mit einem Steuereingang (17) des Hochfrequenzoszillators
(11) verbunden ist,
wobei die zweite Anschlussleitung (7) mit
einem Oszillatorsignal, dessen Schwingung gegenüber der Schwingung am invertierenden
Eingang (14) des Hochfrequenzoszillators (11) um 180° phasenverschoben
ist, beaufschlagt ist, wobei die Kabelabschirmung (5) die erste
und die zweite Anschlussleitung (4, 7) umgreift und die Schwingung
des Hochfrequenzoszillators (11) bei einer Unterbrechung der zweiten
Anschlussleitung (7) spontan einsetzt.Sensor with
A fastening part (1),
A sensor part (2),
A sensor element (3) arranged in the sensor part (2),
- a first connecting line (4) connecting the sensor element (3) to the inverting input (14) of a high-frequency oscillator (11),
- One connected to the output (15) of the high-frequency oscillator (11) cable shield (5) and
- A second connecting line (7) which is connected at its one end in the region of the sensor element (3) with the cable shield (5) and at its other end with a control input (17) of the high frequency oscillator (11)
the second connecting line (7) being supplied with an oscillator signal whose oscillation is 180 ° out of phase with the oscillation at the inverting input (14) of the high-frequency oscillator (11), the cable shielding (5) acting on the first and the second connecting line (4 , 7) surrounds and the oscillation of the high-frequency oscillator (11) spontaneously at an interruption of the second connecting line (7).
Description
Die Erfindung betrifft einen Messfühler zur Erfassung des Füllstandes von in Behältern eingebrachten Medien mit den Merkmalen des Oberbegriffs des Anspruchs 1.The The invention relates to a sensor for the detection of the filling level from in containers introduced media having the features of the preamble of the claim 1.
Ein
Fühler
der eingangs genannten Art ist in der
Zum
Stand der Technik wird weiter auf die
Aufgabe der Erfindung ist es, Fehlmeldungen solcher Messfühler zu verhindern.task The invention is to false reports of such sensors too prevent.
Die Lösung der gestellten Aufgabe wird durch die in Anspruch 1 aufgezeigten Merkmale gelöst, die Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung an.The solution The object is achieved by the indicated in claim 1 Characteristics solved, the dependent claims indicate advantageous embodiments of the invention.
Der Messfühler besteht aus einem Befestigungsteil und einem Fühlerteil und ist über ein Verbindungskabel mit einer dazugehörigen Auswerteelektronik verbunden. In das Fühlerteil ist ein Sensorelement eingebracht, das mit einer ersten Anschlußleitung verbunden und an einen invertierenden Eingang des Hochfrequenzoszillators angeschlossen ist, der einen Teil der Auswertelektronik darstellt. Eine zweite Anschlußleitung ist dem Bereich des Sensorelementes, in dem die erste Anschlußleitung an das Sensorelement angeschlossen ist, mit einer ersten Kabelabschirmung verbunden, wobei das andere Ende der Anschlußleitung mit dem Hochfrequenzoszillator verbunden ist. Die zweite Anschlußleitung ist mit einem Oszillatorsignal beaufschlagt, dessen Amplitude gegenüber der am Eingang des Hochfrequenzoszillator anstehenden Amplitude um annähernd 180° verschoben ist. Bei Unterbrechung dieser zweiten Anschlußleitung ist der Hochfrequenzoszillator, der vorzugsweise aus einem die Oszillatoramplitude erzeugenden und einem die Amplitude verstärkenden Teil besteht, in der Weise beeinflußt, daß bei einem kapazitiv arbeitenden Sensorelement die Amplitude angeregt ist.Of the probe consists of a fastening part and a sensor part and is over a Connecting cable connected to an associated transmitter. In the sensor part a sensor element is introduced, which is connected to a first connecting line connected and to an inverting input of the high-frequency oscillator is connected, which is part of the evaluation electronics. A second connection line is the area of the sensor element in which the first lead is connected to the sensor element, with a first cable shield connected, wherein the other end of the connecting line with the high-frequency oscillator connected is. The second connection line is with an oscillator signal whose amplitude is opposite to that at the input of the high-frequency oscillator pending amplitude shifted by approximately 180 ° is. When interrupting this second connection line is the high-frequency oscillator, the preferably from an oscillator amplitude generating and a amplifying the amplitude Part is affected in such a way that in a capacitive working Sensor element, the amplitude is excited.
Bei einer Unterbrechung der zweiten Anschlußleitung ist diese Leitung daher mit keinem Signal beaufschlagt, das um annähernd 180° gegenüber der ersten Anschlussleitung verschoben ist. Die Oszillatorschwingung setzt spontan ein und signalisiert „Füllstand erreicht". Die Auswerteschaltung kann auch für andere Messprinzipien die z. B. auf Ultraschall, Mikrowellen oder optischen Signalen beruhen, verwendet werden. Von besonderer Bedeutung für die oben beschriebene Fehlersignalisierung ist, daß die erste Anschlußleitung und die zweite Anschlußleitung von einer ersten Kabelabschirmung vorzugsweise koaxial oder symmetrisch umfaßt sind. Zur Unterdrückung von äußeren Störeinflüssen, und auch zur eindeutigen Signalzuordnung der Signalübertragung auf der ersten Kabelabschirmung, ist eine zweite Kabelabschirmung vorgesehen, die die erste Kabelabschirmung umfaßt. Diese zweite Kabelabschirmung ist vorzugsweise mit dem Massepunkt des Hochfrequenzoszillators verbunden. Eine besondere Ausbildung der Erfindung besteht darin, dass das Sensorelement einen zylindrischen Ansatz aufweist, der elektrisch isoliert von einem metallischen Zylinder umfaßt ist. Dieser metallische Zylinder ist direkt oder unter Serienschaltung eines Kondensators mit der zweiten Anschlußleitung verbunden. Diese Maßnahme ist bei geeigneter Dimensionierung dazu geeignet, im Falle einer Unterbrechung der zweiten Anschlussleitung die Amplitude des Hochfrequenzoszillators anzuregen. Eine besonders sichere Ankopplung des Hochfrequenzoszillators an den ersten Kabelschirm kann darin bestehen, daß dieser Anschluß ausschließlich über die zweite Anschlußleitung im Bereich des Sensorelementes erfolgt. Auf diese Weise kann die Phasenlage der ersten Kabelabschirmung sehr genau angepasst und störende Hochfrequenzfelder unterdrückt werden.at an interruption of the second connection line is this line Therefore, with no signal applied, which is approximately 180 ° relative to the first connecting line is moved. The oscillator oscillation starts spontaneously and signals "level reached. "The evaluation circuit can also for other measuring principles the z. B. on ultrasound, microwaves or are based on optical signals. Of particular importance to the above described error signaling is that the first lead and the second connection line from a first cable shield preferably coaxial or symmetrical comprises are. For suppression from external disturbances, and also for unambiguous signal assignment of the signal transmission on the first cable shield, a second cable shield is provided, which is the first cable shield includes. This second cable shield is preferably at the ground point the high-frequency oscillator connected. A special education the invention is that the sensor element is a cylindrical Approach, the electrically isolated from a metallic Cylinder covers is. This metallic cylinder is direct or in series connection a capacitor connected to the second connection line. This measure is suitable dimensioning, in case of interruption the second connecting line, the amplitude of the high-frequency oscillator to stimulate. A particularly secure coupling of the high-frequency oscillator to the first cable shield may be that this Connection exclusively via the second connection line takes place in the region of the sensor element. In this way, the Phase angle of the first cable shielding very accurately adjusted and disturbing High-frequency fields suppressed become.
Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert.Based an embodiment the invention will be closer explained.
In
den Befestigungsteil
In
einer besonderen Ausführung
ist die erste Kabelabschirmung
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000121061 DE10021061B4 (en) | 2000-04-28 | 2000-04-28 | probe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000121061 DE10021061B4 (en) | 2000-04-28 | 2000-04-28 | probe |
Publications (2)
Publication Number | Publication Date |
---|---|
DE10021061A1 DE10021061A1 (en) | 2001-11-15 |
DE10021061B4 true DE10021061B4 (en) | 2008-01-24 |
Family
ID=7640341
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2000121061 Expired - Fee Related DE10021061B4 (en) | 2000-04-28 | 2000-04-28 | probe |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE10021061B4 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3720473A1 (en) * | 1987-06-20 | 1988-12-29 | Stefan Reich | Capacitative level measurement |
DE19756159C1 (en) * | 1997-12-17 | 1999-06-02 | Hiss Eckart | Sensor for detecting presence of electrically insulating fluid or loose material |
DE19756161A1 (en) * | 1997-12-17 | 1999-06-24 | Hiss Eckart | Sensor for detecting electrically insulating fluid or loose material |
-
2000
- 2000-04-28 DE DE2000121061 patent/DE10021061B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3720473A1 (en) * | 1987-06-20 | 1988-12-29 | Stefan Reich | Capacitative level measurement |
DE19756159C1 (en) * | 1997-12-17 | 1999-06-02 | Hiss Eckart | Sensor for detecting presence of electrically insulating fluid or loose material |
DE19756161A1 (en) * | 1997-12-17 | 1999-06-24 | Hiss Eckart | Sensor for detecting electrically insulating fluid or loose material |
Also Published As
Publication number | Publication date |
---|---|
DE10021061A1 (en) | 2001-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: SENSORENTECHNOLOGIE GETTORF GMBH, 24214 GETTOR, DE |
|
8381 | Inventor (new situation) |
Inventor name: HISS, ECKART, DR., 24105 KIEL, DE |
|
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |