DE2233598A1 - CIRCUIT ARRANGEMENT FOR COMPENSATION OF A ZERO-POINT ERROR IN PRESSURE MEASURING - Google Patents
CIRCUIT ARRANGEMENT FOR COMPENSATION OF A ZERO-POINT ERROR IN PRESSURE MEASURINGInfo
- Publication number
- DE2233598A1 DE2233598A1 DE19722233598 DE2233598A DE2233598A1 DE 2233598 A1 DE2233598 A1 DE 2233598A1 DE 19722233598 DE19722233598 DE 19722233598 DE 2233598 A DE2233598 A DE 2233598A DE 2233598 A1 DE2233598 A1 DE 2233598A1
- Authority
- DE
- Germany
- Prior art keywords
- pressure
- circuit arrangement
- point error
- compensation
- zero
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
-
- 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
- G01L9/02—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 by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—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 by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
Description
Schaltungsanordnung zur tompensation eines NullpunktSehlers bei Druckmeßumformern Die Erfindung bezieht sich auf eine Schaltungsanordnung zur Kompensation eines Nullpunktfehlers bei Druck- oder Differenzdruckmeßumformern mit Dehnungsmeßstreifen enthaltenden Widerstandsbrücken.Circuit arrangement for the compensation of a zero point error in pressure transducers The invention relates to a circuit arrangement for compensating for a zero point error for pressure or differential pressure transducers with strain gauges Resistance bridges.
Bei derartigen Meßumformern ist, wie bekannt, im Druckraum als Umformerelement für den Wirkdruck eine Biegefeder enthalten, die mit Dehnungsineßstreifen beklebt ist.In such transducers, as is known, the transducer element is in the pressure chamber Contain a spiral spring for the differential pressure, which is covered with stretch strips is.
Die Dehnungsmeßstreifen liegen in Zweigen einer Widerstandsbrücke, die noch außerhalb des Druckraums angeordnete Festwiderstände enthält.The strain gauges are in branches of a resistance bridge, which still contains fixed resistors arranged outside the pressure chamber.
Der von der Wirkung des statischen Drucks herrührende Nullpunktfehler bei Meßsystemen in Druck- oder Differenzdruckmeßumformern ist auf Unsymmetrien der Meßvolumen, der Membranflächen oder der Zederkonstanten zurückzuführen. Üblicherweise wird versucht, diesen Nullpunktsfehler durch Aussuchen von Funktionselementen bezüglich ihrer Toleranzen in vertretbaren Grenzen zu halten. Dieses Verfahren ist jedoch relativ aufwendig.The zero point error resulting from the effect of static pressure In the case of measuring systems in pressure or differential pressure transducers, the Measurement volume, the membrane areas or the cedar constant. Usually an attempt is made to address this zero point error by looking for functional elements to keep their tolerances within reasonable limits. However, this procedure is relatively complex.
Es besteht die Aufgabe, eine Schaltungsanordnung zu erfinden, die es ermöglicht, den vom statischen Druck herrührenden NullpunktsSehler auf der elektrischen Seite zu kompensieren.The object is to invent a circuit arrangement that it enables the zero point error resulting from the static pressure on the electrical Compensate side.
Als Lösung der. Aufgabe wird eine Schaltungsanordnung der eingangs genannten Art angegeben, die dadurch gekennzeichnet ist, daß ein Brüekenzweig einen dem im Druckraum herrschenden statischen Druck ausgesetzten druckabhängigen Widerstand enthält.As a solution to the. The task is a circuit arrangement of the initially specified type, which is characterized in that a bridge branch a the one prevailing in the pressure chamber static pressure exposed pressure-dependent Contains resistance.
Durch Zuschalten von Parallel- oder Serienwiderständen außerhalb des Druckraums kann so ein Netzwerk geschaffen werden, welches die aus den Unsynimetrien des Meßsystems unter statischem Druck resultierenden Abweichungen des Nullpunkts in guter Näherung kompensiert.By connecting parallel or series resistors outside of the In this way, a network can be created in the pressure space, which is derived from the unsynimetries of the measuring system under static pressure resulting deviations from the zero point compensated to a good approximation.
Als druckabhängige Widerstände werden bevorzugt Metalloxydwiderstände mit niedrigem Temperaturkoeffizienten verwendet, um zusätzlich den störenden Einfluß des Temperaturgangs zu verringern. Die mögliche Verwendung handelsüblicher Schichtwiderstände ist im Hinblick auf geringen Aufwand als besonders vorteilhaft anzusehen.Metal oxide resistors are preferred as pressure-dependent resistors with a low temperature coefficient used to additionally reduce the disturbing influence to reduce the temperature response. The possible use of commercially available film resistors is to be regarded as particularly advantageous in view of the low expenditure.
Zur Erläuterung der Erfindung ist in der Figur ein Ausführungsbeispiel einer derartigen Dehnungsmeßstreifenwiderstandsbrücke schematisch dargestellt und im folgenden beschrieben.An exemplary embodiment is shown in the figure to explain the invention such a strain gauge resistor bridge shown schematically and described below.
Eine in Differenzdruckmeßumformern verwendete Dehnungsmeßstreifenwiderstandsbrücke besteht im wesentlichen aus zwei Dehnungsmeßstreifen DMS, die in benachbarten Brückenzweigen geschaltet und innerhalb des Druckraums des Differenzdruckmeßumformers auf einer von der Meßkraft beaufschlagten Biegefeder befestigt sind.A strain gauge resistor bridge used in differential pressure transducers consists essentially of two strain gauges, which are located in adjacent bridge branches switched and within the pressure chamber of the differential pressure transducer on a are attached by the measuring force applied spiral spring.
Die Widerstandsbrücke mit ihrer Speisediagonalen S, S' und ihrer Meßdiagonalen M, M' wird vervollständigt durch weitere Widerstände R1, R2 und R3. Der Widerstand Ri ist ein druckabhängiger Metalloxydwiderstand, der-ebenfalls innerhalb des durch eine gestrichelte Umrahmung angedeuteten Druckraums D im Differenzdruckmeßumformer angeordnet und so dem dort herrschenden statischen Druck ausgesetzt ist. Zu einem möglichst genauen Abgleich ist es dabei notwendig, dem Widerstand Ri beispielsweise einen weiteren Festwiderstand R2 parallel zu schalten. Der Widerstand R2 kann dabei außerhalb des Druckraums D angeordnet werden, wie auch der im vierten Brückenzweig liegende Widerstand R3, dessen Widerstandswert dem der Parallelschaltung von Widerstand R1 und Widerstand R2 entspricht.The resistance bridge with its food diagonals S, S 'and its measuring diagonals M, M 'is completed by further resistors R1, R2 and R3. The resistance Ri is a pressure-dependent metal oxide resistor, which-also within the through a dashed frame indicated pressure space D in the differential pressure transducer arranged and is thus exposed to the static pressure prevailing there. To a It is necessary to match the resistance Ri, for example, as precisely as possible to connect another fixed resistor R2 in parallel. The resistance R2 can be arranged outside of the pressure chamber D, as well as that in the fourth Resistor R3 lying on the bridge branch, whose resistance value corresponds to that of the parallel connection of resistor R1 and resistor R2 corresponds.
Damit ist ohne großen aufwand in der Fertigung der vom statischen Druck infolge von Unsymmetrien im Meßsystem hervorgerufene Nullpunktfehler kompensierbar, da nunmehr das Aussuchen der Teile des Meßsystems entfällt.This means that the static is easy to manufacture Pressure zero point errors caused by asymmetries in the measuring system can be compensated, since there is no longer any need to select the parts of the measuring system.
2 Patentansprüche 1 Figur2 claims 1 figure
Claims (2)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722233598 DE2233598C3 (en) | 1972-07-07 | Pressure transducer | |
| JP7643173A JPS4945783A (en) | 1972-07-07 | 1973-07-06 | Zerotengosano hoshokairosochi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722233598 DE2233598C3 (en) | 1972-07-07 | Pressure transducer |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2233598A1 true DE2233598A1 (en) | 1974-01-24 |
| DE2233598B2 DE2233598B2 (en) | 1974-06-06 |
| DE2233598C3 DE2233598C3 (en) | 1976-02-12 |
Family
ID=
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2613833A1 (en) * | 1987-04-07 | 1988-10-14 | Europ Propulsion | Strain gauge sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2613833A1 (en) * | 1987-04-07 | 1988-10-14 | Europ Propulsion | Strain gauge sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2233598B2 (en) | 1974-06-06 |
| JPS5419193B2 (en) | 1979-07-13 |
| JPS4945783A (en) | 1974-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| EHJ | Ceased/non-payment of the annual fee |