DE1281163B - Electrical device for measuring liquid columns - Google Patents
Electrical device for measuring liquid columnsInfo
- Publication number
- DE1281163B DE1281163B DE1964ST023120 DEST023120A DE1281163B DE 1281163 B DE1281163 B DE 1281163B DE 1964ST023120 DE1964ST023120 DE 1964ST023120 DE ST023120 A DEST023120 A DE ST023120A DE 1281163 B DE1281163 B DE 1281163B
- Authority
- DE
- Germany
- Prior art keywords
- electrical device
- measuring liquid
- liquid columns
- electrodes
- measuring
- 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.)
- Pending
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
- G01F23/24—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 resistance of resistors due to contact with conductor fluid
-
- 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
- G01L9/0091—Transmitting or indicating the displacement of liquid mediums by electrical, electromechanical, magnetic or electromagnetic means
Description
Elektrische Einrichtung zur Messung von Flüssigkeitssäulen Die Erfindung betrifft eine elektrische Einrichtung zur Messung von Flüssigkeitssäulen mittels Elektroden, insbesondere von Kesselwasserständen und Differenzdruckmessern.Electrical device for measuring liquid columns. The invention relates to an electrical device for measuring liquid columns by means of Electrodes, especially of boiler water levels and differential pressure meters.
Es sind Flüssigkeitsstandanzeiger bekannt, bei denen mehrere in verschiedenen Höhenlagen angeordnete Elektroden in die Flüssigkeit eintauchen und dadurch einzelne Teilstromkreise über die von der Flüssigkeit zwischen Elektrode und Gefäßwand gebildeten Widerstände (Elektrodenwiderstände) schließen. Die Summe der Teilströme ist dann ein Maß (Meßstrom) für die Länge der Flüssigkeitssäule. Bei anderen bekannten Einrichtungen ist die eintauchende Elektrode selbst als elektrischer Widerstand ausgebildet, von dem je nach der Eintauchtiefe ein mehr oder weniger großer Teil durch die Flüssigkeit kurzgeschlossen wird. Auch hier fließt der Meßstrom von der Elektrode über den Elektrodenwiderstand zur Gefäßwand. Da der Elektrodenwiderstand immer dem spezifischen Flüssigkeitswiderstand proportional sein muß, ist der Meßstrom dieser bekannten Einrichtungen nicht unabhängig vom spezifischen Flüssigkeitswiderstand. Ändert sich der spezifische Widerstand während der Messung - bei Kesselwasserständen z. B. ist dies wegen der sich im Betrieb ändernden Salzkonzentration mindestens innerhalb der Grenzen 1... 10 möglich -, so ergeben sich bei den bekannten Einrichtungen Anzeigefehler. There are liquid level indicators are known in which several in different Immerse electrodes arranged at high altitudes in the liquid and thereby individual Partial circuits via those formed by the liquid between the electrode and the vessel wall Close resistors (electrode resistors). The sum of the partial flows is then a measure (measuring current) for the length of the liquid column. At other known facilities the immersing electrode itself is designed as an electrical resistor, of depending on the depth of immersion, a more or less large part through the liquid is short-circuited. Here, too, the measuring current flows from the electrode via the electrode resistance to the vessel wall. Since the electrode resistance always corresponds to the specific fluid resistance must be proportional, the measuring current of these known devices is not independent the specific fluid resistance. If the specific resistance changes during the measurement - at boiler water levels e.g. B. this is because of the operation changing salt concentration possible at least within the limits 1 ... 10 -, this results in display errors in the known devices.
Aufgabe der Erfindung ist eine Einrichtung, die eine vom spezifischen Flüssigkeitswiderstand unabhängige Messung der Flüssigkeitssäule ermöglicht. The object of the invention is a device that is one of the specific Liquid resistance enables independent measurement of the liquid column.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Verhältnis zweier Elektrodenströme als Maß für die Länge der Flüssigkeitssäule verwendet wird.The object is achieved according to the invention in that the ratio two electrode currents is used as a measure of the length of the liquid column.
Dieses Stromverhältnis ist vom spezifischen Flüssigkeitswiderstand weitgehend unabhängig, und deshalb bleibt der Anzeigefehler auch bei sich während der Messung stark ändernden spezifischen Widerständen sehr klein.This current ratio is based on the specific fluid resistance largely independent, and therefore the display error also remains with itself during the measurement of strongly changing specific resistances is very small.
Das Verhältnis zweier Ströme kann auf verschiedene Weise gemessen werden. Besonders einfach ist es erfindungsgemäß mittels eines bekannten, listenmäßig erhältlichen Quotientenmeßwerks oder Ohmmeters. Eine vorteilhafte Ausbildung der Einrichtung wird besonders für hohe Temperaturen und Drücke erfindungsgemäß dadurch erreicht, daß die Elektroden in einen bekannten, ebenfalls listenmäßig erhältlichen Glaswasserstandsanzeiger (Reflexionsglasanzeiger) eingebaut werden. Die Elektroden sind dann jederzeit sichtbar, und es kann die Funktion des ganzen Gerätes in einfachster Weise im Betrieb überprüft werden. The ratio of two currents can be measured in different ways will. According to the invention, it is particularly simple by means of a known, list-based method available quotient measuring mechanism or ohmmeter. An advantageous training of the The device is particularly suitable for high temperatures and pressures according to the invention achieves that the electrodes in a known, also available in the list Glass water level indicators (reflective glass indicators) can be installed. The electrodes are then visible at all times, and the function of the entire device can be performed in the simplest Way to be checked in operation.
Ein Ausführungsbeispiel ist in der Zeichnung in schematischer Form dargestellt. Es bedeutet 1 das Metallgehäuse eines Anzeigegerätes mit der Flüssigkeitssäule 2, 3 die zusammengefaßten Elektroden des einen Stromkreises, 3' die Elektrode des anderen Stromkreises, 4 die gemeinsame Wechselspannungsquelle und 5 ein Quotientenmeßwerk, dessen eine Spule an die Elektroden 3 und dessen andere Spule an 3' angeschlossen ist. Das Quotientenmeßwerk 5 zeigt das Verhältnis der durch seine Spulen fließenden Elektrodenströme als Maß für die Länge der Flüssigkeitssäule 2 unabhängig vom wechselnden spezifischen Flüssigkeitswiderstand - bei nichtleitenden Flüssigkeiten unabhängig von ihrer Dielektrizitätskonstante - an. An exemplary embodiment is shown in the drawing in schematic form shown. It means 1 the metal housing of a display device with the liquid column 2, 3 the combined electrodes of one circuit, 3 'the electrode of the other circuit, 4 the common AC voltage source and 5 a quotient measuring mechanism, one coil of which is connected to the electrodes 3 and the other coil of which is connected to 3 ' is. The quotient measuring mechanism 5 shows the ratio of the flow through its coils Electrode currents as a measure of the length of the liquid column 2 regardless of the changing specific fluid resistance - independent of non-conductive fluids from their dielectric constant - on.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1964ST023120 DE1281163B (en) | 1964-12-21 | 1964-12-21 | Electrical device for measuring liquid columns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1964ST023120 DE1281163B (en) | 1964-12-21 | 1964-12-21 | Electrical device for measuring liquid columns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1281163B true DE1281163B (en) | 1968-10-24 |
Family
ID=7459633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1964ST023120 Pending DE1281163B (en) | 1964-12-21 | 1964-12-21 | Electrical device for measuring liquid columns |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1281163B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4371790A (en) * | 1980-09-19 | 1983-02-01 | Rmr Systems, Inc. | Fluid measuring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE398529C (en) * | 1922-01-03 | 1924-07-15 | Willibald Fuhrmann | Water level indicator for steam boiler u. Like. With communicating vessel |
| DE449533C (en) * | 1924-06-01 | 1927-09-20 | Stephan Loeffler | Device for displaying the water level |
| DE498898C (en) * | 1925-05-16 | 1930-06-14 | Jenny Elfriede Loeffler Geb Bo | Remote liquid level indicator for hot high pressure rooms |
| DE567320C (en) * | 1930-10-17 | 1932-12-31 | Aegir Fabrik Fuer Elek Sche Ap | Electrical telecommunication device for liquid levels |
-
1964
- 1964-12-21 DE DE1964ST023120 patent/DE1281163B/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE398529C (en) * | 1922-01-03 | 1924-07-15 | Willibald Fuhrmann | Water level indicator for steam boiler u. Like. With communicating vessel |
| DE449533C (en) * | 1924-06-01 | 1927-09-20 | Stephan Loeffler | Device for displaying the water level |
| DE498898C (en) * | 1925-05-16 | 1930-06-14 | Jenny Elfriede Loeffler Geb Bo | Remote liquid level indicator for hot high pressure rooms |
| DE567320C (en) * | 1930-10-17 | 1932-12-31 | Aegir Fabrik Fuer Elek Sche Ap | Electrical telecommunication device for liquid levels |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4371790A (en) * | 1980-09-19 | 1983-02-01 | Rmr Systems, Inc. | Fluid measuring system |
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