DE19756161B4 - Scoring System - Google Patents
Scoring System Download PDFInfo
- Publication number
- DE19756161B4 DE19756161B4 DE1997156161 DE19756161A DE19756161B4 DE 19756161 B4 DE19756161 B4 DE 19756161B4 DE 1997156161 DE1997156161 DE 1997156161 DE 19756161 A DE19756161 A DE 19756161A DE 19756161 B4 DE19756161 B4 DE 19756161B4
- Authority
- DE
- Germany
- Prior art keywords
- oscillator
- sensor
- switch
- frequency
- medium
- 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
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
- G01F23/263—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
- G01F23/268—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 mounting arrangements of probes
-
- 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
-
- 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
- G01F23/266—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 measuring circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Verfahren zur Erfassung des Vorhandenseins von elektrisch isolierenden Flüssigkeiten oder Granulaten mit einem Sensor, der ein in eine Wandung einschraubbares Gehäuse aufweist, mit einem ersten Oszillator (8), dessen Frequenz durch eine Kapazitätsänderung des Sensors beeinflusst ist, sobald eine Sensorspitze (4) des Sensors in ein Medium eintaucht, mit einem zweiten Oszillator (21), der einen ersten Schalter (22) steuert, der periodisch einen Innenleiter (15) und einen mit einem Massepunkt (13) verbundenen Kondensator (23) mit einem Eingang des ersten Oszillators (8) verbindet, mit einem zweiten Schalter (24), der von dem zweiten Oszillator (21) gesteuert ist, und der Eingänge eines differenzbildenden Schaltkreises (25) mit einem Ausgang eines Demodulators (9) verbindet, dessen Eingang an einen Ausgang des ersten Oszillators (8) angeschlossen ist.Method for detecting the presence of electrically insulating liquids or granules with a sensor having a housing which can be screwed into a wall, having a first oscillator (8) whose frequency is influenced by a capacitance change of the sensor as soon as a sensor tip (4) of the sensor immersed in a medium having a second oscillator (21) which controls a first switch (22) periodically connecting an inner conductor (15) and a capacitor (23) connected to a ground point (13) to an input of the first oscillator (8 ), with a second switch (24) controlled by the second oscillator (21) and the inputs of a difference-forming circuit (25) connected to an output of a demodulator (9) whose input is connected to an output of the first oscillator (21). 8) is connected.
Description
Das Verfahren dient der Erfassung des Vorhandenseins von elektrisch isolierenden Flüssigkeiten oder Granulaten. Es beruht auf einem in eine Wandung einschraubbaren Sensor, der vorzugsweise aus Metall gefertigt ist, mit einem koaxial aufgebauten Anschlusskabel, das an einen Oszillator angeschlossen ist.The Method is used to detect the presence of electrical insulating fluids or granules. It is based on a screwed into a wall Sensor, which is preferably made of metal, with a coaxial Built connection cable connected to an oscillator is.
Verfahren
der eingangs genannten Art werden dazu eingesetzt, Füllstände unterschiedlicher Medien
innerhalb von Rohrleitungen oder Behältern zu erfassen. Das Funktionsprinzip
beruht auf einer in das Medium eintauchenden Elektrode, die als
Teil eines Kondensators wirkt, wobei die Elektrode die erste Kondensatorplatte
und die vorzugsweise metallische Behälterwandung die zweite Kondensatorplatte bildet.
Jedes Medium, das zwischen Elektrode und Behälterwandung tritt, wirkt als
Dielektrikum dieses so beschriebenen Kondensators und ändert dessen Kapazität. Es sind
unterschiedliche Verfahren bekannt, die diese Kapazitätsänderung
ausnutzen um hieraus ein Messsignal abzuleiten. In den Schriften
Aufgabe der Erfindung ist es ein Verfahren zur driftfreien und störsicheren Auswertung der Kapazitätsänderung eines Sensors beim Eintauchen der Sensorspitze in ein Medium anzugeben.task The invention is a method for drift-free and interference-proof Evaluation of the capacity change of a sensor when immersing the sensor tip in a medium.
Die Lösung der Aufgabenstellung ist in dem Anspruch 1 dargelegt. Die Unteransprüche geben vorteilhafte Ausgestaltungen der Erfindung an.The solution The task is set out in the claim 1. The dependent claims give advantageous Embodiments of the invention.
Der Sensor besteht aus einem in eine Behälterwandung einschraubbaren Gehäuse, das mediumseitig eine mit einem metallischen Stift versehene Sensorspitze aufweist, die in das Medium eintaucht. Das Gehäuse ist an der dem Medium abgewandten Seite offen ausgeführt, wobei in diese Öffnung ein koaxiales Kabel eingeführt ist. Die Kabeleinführung wird vorzugsweise durch eine geeignete Kabelverschraubung abgeschlossen. Das koaxiale Kabel weist einen inneren Leiter auf, der elektrisch mit dem metallischen Stift der Sensorspitze verbunden ist. Der Innenleiter des koaxialen Kabels ist von einem Schirm umgeben. Das koaxiale Kabel ist an eine elektrische Auswertung angeschlossen.Of the Sensor consists of a screwed into a container wall Casing, the medium side, a provided with a metallic pin sensor tip has, which dips into the medium. The housing is on the side facing away from the medium open, being in this opening a coaxial cable introduced is. The cable entry is preferably completed by a suitable cable gland. The coaxial cable has an inner conductor, which is electrically connected to the metallic pin of the sensor tip. The inner conductor of the coaxial cable is surrounded by a screen. The coaxial Cable is connected to an electrical evaluation.
Die
Drift der elektrischen Auswertung kann dadurch wesentlich reduziert
werden, dass ein von einem Oszillator
Anhand mehrerer Ausführungsbeispiele wird die Erfindung näher erläutert.Based several embodiments the invention will be closer explained.
Die
Sensorspitze
Die
auswertende Elektronik ist in
Der
erste Schalter
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997156161 DE19756161B4 (en) | 1997-12-17 | 1997-12-17 | Scoring System |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997156161 DE19756161B4 (en) | 1997-12-17 | 1997-12-17 | Scoring System |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19756161A1 DE19756161A1 (en) | 1999-06-24 |
DE19756161B4 true DE19756161B4 (en) | 2010-08-05 |
Family
ID=7852295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1997156161 Expired - Fee Related DE19756161B4 (en) | 1997-12-17 | 1997-12-17 | Scoring System |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19756161B4 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10021061B4 (en) * | 2000-04-28 | 2008-01-24 | Hiss, Eckart, Dr. | probe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0049793A2 (en) * | 1980-10-14 | 1982-04-21 | i f m electronic gmbh | Contactless electronic switching device |
DE4217305A1 (en) * | 1992-05-06 | 1993-12-02 | Franc Eferl | Level detecting switch for use with liquid, granular or powder materials - has probe with electrode and dielectric body enclosed by earthed annular counter electrode |
DE19536198A1 (en) * | 1995-09-28 | 1997-04-03 | Endress Hauser Gmbh Co | Capacitive switch |
-
1997
- 1997-12-17 DE DE1997156161 patent/DE19756161B4/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0049793A2 (en) * | 1980-10-14 | 1982-04-21 | i f m electronic gmbh | Contactless electronic switching device |
DE4217305A1 (en) * | 1992-05-06 | 1993-12-02 | Franc Eferl | Level detecting switch for use with liquid, granular or powder materials - has probe with electrode and dielectric body enclosed by earthed annular counter electrode |
DE19536198A1 (en) * | 1995-09-28 | 1997-04-03 | Endress Hauser Gmbh Co | Capacitive switch |
Also Published As
Publication number | Publication date |
---|---|
DE19756161A1 (en) | 1999-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8364 | No opposition during term of opposition | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20140701 |