DE2744786A1 - CORRECTION OF THE DELAY IN MEASURING CHAINS - Google Patents
CORRECTION OF THE DELAY IN MEASURING CHAINSInfo
- Publication number
- DE2744786A1 DE2744786A1 DE19772744786 DE2744786A DE2744786A1 DE 2744786 A1 DE2744786 A1 DE 2744786A1 DE 19772744786 DE19772744786 DE 19772744786 DE 2744786 A DE2744786 A DE 2744786A DE 2744786 A1 DE2744786 A1 DE 2744786A1
- Authority
- DE
- Germany
- Prior art keywords
- measuring
- arrangement according
- following feature
- differential
- delay
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
Description
24.384.424.384.4
tvs203339tvs203339
27.09.7709/27/77
INTERATOMINTERATOM
Internationale Atomreaktorbau GmbH 5060 Bergisch Gladbach 1Internationale Atomreaktorbau GmbH 5060 Bergisch Gladbach 1
Die vorliegende Erfindung betrifft eine Anordnung zur Korrektur der zeitlich exponentiellen Verzögerung in Meßketten, insbesondere zur Druck- bzw. Differenzdruck-Messung und übertragung mit Kapillarrohren.The present invention relates to an arrangement for correcting the time exponential delay in Electrodes, especially for pressure or differential pressure measurement and transmission with capillary tubes.
Meßketten, die teilweise nichtelektrische Meßglieder aufweisen, haben naturgemäß Verzögerungen, die bis jetzt als gegeben hingenommen wurden. Bei Druckübertragung durch Kapillare oder extrem lange Druckentnahmeleitungen sind Durchmesser und Länge der übertragungsleitung in Verbindung mit einer Volumenverschiebung im Meßwerk für diese Verzögerung von Bedeutung. Bei Temperatur-Meßketten sind Wärmeübergangszahlen, Wärmeleitfähigkeit und übertragende Fläche von Bedeutung.. Auf einigen Gebieten der Technik haben Meßketten eine zeitlich etwa expontielle Verzögerung. Eine Ver zögerung ist oft nicht erwünscht, bei Messungen, die der Sicherheit einer Anlage dienen, sogar gefährlich. Beispielsweise hat eine bei flüssigmetallgekühlten Kernkraftwerken durchaus übliche Kapillarrohrleitung mit einem Innendurchmesser von 2 mm, und einer Länge von 2 mal 15 m je nach Art und Meßbereich des ange schlossenen Meßwerks eine Zeitkonstante von 60 s bis das Anzeigeinstrument 63 % einer Druckäncerung anzeigt.Measuring chains, some of which have non-electrical measuring elements, naturally have delays that have hitherto been accepted as given. In the case of pressure transmission through capillaries or extremely long pressure sampling lines, the diameter and length of the transmission line in connection with a volume shift in the measuring mechanism are important for this delay. In the case of temperature electrodes, heat transfer coefficients, thermal conductivity and transferring area are important. In some areas of technology, electrodes have an approximately expontial time lag. A delay is often undesirable, and it can even be dangerous for measurements that serve the safety of a system. For example, a capillary tube with an inner diameter of 2 mm and a length of 2 by 15 m, which is quite common in liquid metal-cooled nuclear power plants, has a time constant of 60 s until the display instrument shows 63% of a pressure change, depending on the type and measuring range of the measuring mechanism connected.
909816/0049909816/0049
Aufgabe der vorliegenden Erfindung ist eine Anordnung zur Korrektur einer zeitlich etwa exponentiellen Verzögerung in Meßketten.The object of the present invention is an arrangement for correcting an approximately exponential delay in time in electrodes.
Zur Lösung dieser Aufgabe wird eine Anordnung nach dem 1. Anspruch vorgeschlagen. Bei einer zeitlich etwa exponentiellen Verzögerung ist der Differentialquotient zu Anfang besonders groß, so daß die vorgeschlagene Addition zu dem anstehenden Meßsignal sehr schnell eine deutliche Änderung anzeigt. Da der Differentialquotient mit fortschreitender Zeit naturgemäß kleiner wird, dafür das Meßsignal selbst aber größer wird, ergibt die Addition beider Werte ein Meßsignal, das wesentlich eher als bisher der tatsächlichen Meßgröße am Fühler entspricht.To solve this problem, an arrangement according to claim 1 is proposed. At one time, for example exponential delay is the differential quotient particularly large at the beginning, so that the proposed addition to the pending measurement signal very quickly a indicates significant change. Since the differential quotient naturally gets smaller with the passage of time, this is the case but the measurement signal itself becomes larger, the addition of the two values results in a measurement signal that is essential corresponds to the actual measured variable on the probe more than before.
In weiterer Ausgestaltung der Erfindung wird eine Anordnung nach dem 2. Anspruch vorgeschlagen. Mit dieser Abgleichvorrichtung kann der Einfluß unterschiedlicher geometrischer Bedingungen, also beispielsweise Länge und Durchmesser einer Meßleitung, und der Eigenschaften des Obertragungsmediums auf die Verzögerung weitgehend vermieden werden. Wenn also beispielsweise bei einer hydraulischen Druckübertragung die Kapillarrohrleitung besonders lang ist, kann dies durch einen größeren Differentialquotienten ausgeglichen werden.In a further embodiment of the invention, an arrangement according to claim 2 is proposed. With this balancing device can be the influence of different geometric conditions, for example length and Diameter of a measuring line, and the properties of the transmission medium on the delay largely avoided will. So if, for example, with a hydraulic pressure transmission, the capillary pipeline is particularly is long, this can be compensated for by a larger differential quotient.
In weiterer Ausgestaltung der Erfindung wird eine Anordnung nach dem 3. Anspruch vorgeschlagen. Das vorgeschlagene Zeitglied verhindert, daß nach einem Spannungsausfall der dann naturgemäß sehr hohe Differentialquotient ein Meßsignal liefert, das nicht durch Änderungen der Meßgröße am Fühler verursacht wurde.In a further embodiment of the invention, an arrangement proposed according to the 3rd claim. The proposed timer prevents after a power failure the then naturally very high differential quotient provides a measurement signal that is not affected by changes in the Measured variable was caused on the sensor.
909816/0049909816/0049
In weiterer Ausgestaltung der Erfindung wird eine Anordnung nach dem 4. Anspruch vorgeschlagen. Die vorgeschlagene Unterbrechung der Addition soll verhindern, daß bei den üblichen Eich- und Wartungsarbeiten ein Meßsignal entsteht, das nicht der Meßgröße entspricht.In a further embodiment of the invention, an arrangement according to claim 4 is proposed. The proposed Interrupting the addition is intended to prevent a Measurement signal arises which does not correspond to the measured variable.
In weiterer Ausgestaltung der Erfindung wird eine Anordnung nach dem 5. Anspruch vorgeschlagen. Die vorgeschlagene Anwendung dieser Erfindung auf eine Meßkette mit einem oder mehreren Kapillarrohren zur Druckbzw. Differenzdruck-Messung erscheint nach den bisherigen Versuchen und Berechnungen als die aussichtsreichste. Es soll aber nicht ausgeschlossen werden, daß diese Anordnung auch für andere Messungen benutzt werden kann.In a further embodiment of the invention, an arrangement according to claim 5 is proposed. The proposed Application of this invention to a measuring chain with one or more capillary tubes for pressure or. According to previous experiments and calculations, differential pressure measurement appears to be the most promising. However, it should not be ruled out that this arrangement can also be used for other measurements.
Die Zeichnung zeigt in schematischer Darstellung ein mögliches Anführungsbeispiel der Erfindung in Form einer Meßkette zur Messung und übertragung des Druckes an einer Flüssigmetall führenden Anlage. Der Faltenbalg 1 überträgt den Druck ρ einer Flüssigmetall führenden Anlage 2 über eine Kapillarrohrleitung 3, die eine auch bei Raumtemperatur flüssige Mischung aus Natrium und Kalium enthält, über eine Trennmembran 4 und über eine 2. Kapillarrohrleitung 5 auf einen Druckmeßwandler 6, bestehend aus einem mechanischen Meßwerk beispielsweise mit Differential-Transformator, Gleichrichter und Verstärker. Die von 6 abgegebene Spannung wird in dem Additionsglied 7 gegebenenfalls geändert und von dem Endverstärker 8 in einen Strom verwandelt, der auf dem Anzeigeinstrument 9 sichtbar gemacht wird. Zwischen 6 und 7 ist ein Differenzierglied 10 und ein Anpassungsverstärker 11 geschaltet, mit denen der zeitliche Differentialquotient in veränderbarer Größe demThe drawing shows a schematic representation possible exemplary embodiment of the invention in the form of a measuring chain for measuring and transmitting the pressure on a liquid metal plant. The bellows 1 transmits the pressure ρ of a liquid metal leading Plant 2 via a capillary tube 3, which is a liquid mixture of sodium even at room temperature and contains potassium, via a separating membrane 4 and via a 2nd capillary tube 5 to a pressure transducer 6, consisting of a mechanical measuring mechanism, for example with a differential transformer, rectifier and amplifier. The voltage output by 6 is changed in the adder 7 if necessary and by the Power amplifier 8 is converted into a current which is made visible on the display instrument 9. Between 6 and 7, a differentiating element 10 and a matching amplifier 11 are connected, with which the temporal Differential quotient in changeable size dem
909816/0049909816/0049
■*-■ * - 27U78627U786
- G- - G-
Additionsglied 7 zugeführt wird. Auf das Differenzierglied 10 wirkt entweder ein automatisch vom Netz gesteuertes Zeitglied 12, das nach einem Netzausfall für eine bestimmte Zeit den Differenziervorgang durch Relais 13 unterbricht oder eine Handabschaltung 14, mit der bei Wartung oder Eichung die gleiche Unterbrechung beliebig lange erfolgen kann.Adding member 7 is supplied. On the differentiator 10 either a timer 12 automatically controlled by the network acts after a power failure interrupts the differentiation process for a certain time by relay 13 or manual shutdown 14, with which the same interruption can be carried out for as long as required during maintenance or calibration.
909816/0049909816/0049
Claims (6)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772744786 DE2744786A1 (en) | 1977-10-05 | 1977-10-05 | CORRECTION OF THE DELAY IN MEASURING CHAINS |
FR7828433A FR2405462A1 (en) | 1977-10-05 | 1978-10-04 | DEVICE FOR CORRECTION OF THE DELAY OCCURRING IN MEASURING CHANNELS |
GB7839340A GB2005842B (en) | 1977-10-05 | 1978-10-04 | Monitoring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772744786 DE2744786A1 (en) | 1977-10-05 | 1977-10-05 | CORRECTION OF THE DELAY IN MEASURING CHAINS |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2744786A1 true DE2744786A1 (en) | 1979-04-19 |
Family
ID=6020717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19772744786 Ceased DE2744786A1 (en) | 1977-10-05 | 1977-10-05 | CORRECTION OF THE DELAY IN MEASURING CHAINS |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2744786A1 (en) |
FR (1) | FR2405462A1 (en) |
GB (1) | GB2005842B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3011892A1 (en) * | 1980-03-27 | 1981-10-01 | Robert Bosch Gmbh, 7000 Stuttgart | Vehicle engine ignition control - uses weighted difference between successive values from intake pressure sensor, fed to control via microprocessor |
DE3042951A1 (en) * | 1980-11-14 | 1982-07-22 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Control system for valve - prevents hunting by using actual pressure and rate of change of pressure as control parameters |
DE3620723A1 (en) * | 1986-06-20 | 1987-12-23 | Bbc Brown Boveri & Cie | METHOD AND DEVICE FOR DISPLAYING A CHANGING MEASURED VALUE |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3341473A1 (en) * | 1983-11-17 | 1985-05-30 | SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen | Measuring device, especially for indicating the tank contents in motor vehicles |
GB2447293A (en) * | 2007-03-09 | 2008-09-10 | Lasermet Ltd | Electronic detecting apparatus for predicting the steady state value of a detector output |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237347B (en) * | 1963-12-30 | 1967-03-23 | Corning Glass Works | Electrical measuring device with short response time |
DE2118812B2 (en) * | 1971-03-25 | 1972-07-06 | Landis & Gyr A.G., Zug (Schweiz) | Statistical events averager - integrating momentary values with time constant dependent on density of event occurrence |
DE2216111A1 (en) * | 1972-04-01 | 1973-10-04 | Sachs Elektronik Kg Hugo | Circuit to eliminate induced vibration components - input signals composed of different frequencies and ampliftudes supplied to transducer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2728522A (en) * | 1951-04-21 | 1955-12-27 | Univ Illinois | Anticipator system |
SE385503B (en) * | 1971-04-14 | 1976-07-05 | Finike Italiana Marposs | DEVICE FOR QUICK SATURATION OF MECHANICAL BODIES |
DE2444856A1 (en) * | 1974-09-19 | 1976-04-01 | Siemens Ag | Extended relaxation time used to find parameter value in rapid process - this parameter being functionally linked to a second measurable parameter having short relaxation time |
SE395059B (en) * | 1975-11-12 | 1977-07-25 | Asea Ab | DEVICE FOR INDICATING INTERRUPTION IN THE METHET CIRCUIT OF RESISTANCE THERMOMETERS IN THERMO GUARDS |
US4092863A (en) * | 1977-01-12 | 1978-06-06 | Johnson & Johnson | Electronic thermometer circuit |
-
1977
- 1977-10-05 DE DE19772744786 patent/DE2744786A1/en not_active Ceased
-
1978
- 1978-10-04 FR FR7828433A patent/FR2405462A1/en active Granted
- 1978-10-04 GB GB7839340A patent/GB2005842B/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237347B (en) * | 1963-12-30 | 1967-03-23 | Corning Glass Works | Electrical measuring device with short response time |
DE2118812B2 (en) * | 1971-03-25 | 1972-07-06 | Landis & Gyr A.G., Zug (Schweiz) | Statistical events averager - integrating momentary values with time constant dependent on density of event occurrence |
DE2216111A1 (en) * | 1972-04-01 | 1973-10-04 | Sachs Elektronik Kg Hugo | Circuit to eliminate induced vibration components - input signals composed of different frequencies and ampliftudes supplied to transducer |
Non-Patent Citations (1)
Title |
---|
In Betracht gezogenes älteres Patent: DE-PS 27 15 738: * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3011892A1 (en) * | 1980-03-27 | 1981-10-01 | Robert Bosch Gmbh, 7000 Stuttgart | Vehicle engine ignition control - uses weighted difference between successive values from intake pressure sensor, fed to control via microprocessor |
DE3042951A1 (en) * | 1980-11-14 | 1982-07-22 | Brown Boveri Reaktor GmbH, 6800 Mannheim | Control system for valve - prevents hunting by using actual pressure and rate of change of pressure as control parameters |
DE3620723A1 (en) * | 1986-06-20 | 1987-12-23 | Bbc Brown Boveri & Cie | METHOD AND DEVICE FOR DISPLAYING A CHANGING MEASURED VALUE |
Also Published As
Publication number | Publication date |
---|---|
GB2005842A (en) | 1979-04-25 |
FR2405462B1 (en) | 1983-10-21 |
GB2005842B (en) | 1982-02-03 |
FR2405462A1 (en) | 1979-05-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAM | Search report available | ||
OC | Search report available | ||
8110 | Request for examination paragraph 44 | ||
8127 | New person/name/address of the applicant |
Owner name: INTERATOM GMBH, 5060 BERGISCH GLADBACH, DE |
|
8131 | Rejection |