DE1070838B - - Google Patents
Info
- Publication number
- DE1070838B DE1070838B DENDAT1070838D DE1070838DA DE1070838B DE 1070838 B DE1070838 B DE 1070838B DE NDAT1070838 D DENDAT1070838 D DE NDAT1070838D DE 1070838D A DE1070838D A DE 1070838DA DE 1070838 B DE1070838 B DE 1070838B
- Authority
- DE
- Germany
- Prior art keywords
- scanning device
- tube
- photoelectric
- liquid
- indicator
- 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
- 239000007788 liquid Substances 0.000 claims description 22
- 230000000694 effects Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 6
- 230000005499 meniscus Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement 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
- G01F23/24—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
- G01F23/245—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 with a probe moved by an auxiliary power, e.g. meter, to follow automatically the level
-
- 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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Description
kl. 42 6 34kl. 42 6 34
PATENTAMTPATENT OFFICE
S57975IX/42eS57975IX / 42e
BFKANNTMtrHlING DER ANMELDUNG UND AUSGABE DEB Λl'S LEG E S CH RI FT:BFKANNTMtrHlING THE REGISTRATION AND ISSUE DEB Λl'S LEG E S CH RI FT:
: ι. λ ρ κ 11. 19:. η: ι. λ ρ κ 11. 19 :. η
10 DKZKM HKK I·>.-.<»10 DKZKM HKK I ·> .-. <»
Uie Erfindung IjetrifFt eine Abtastvorrichtung für Flüssigkeitsstände in zylindrischen Röhren.Uie invention IjetrifFt a sensing device for liquid levels in cylindrical tubes.
Es sind fotoelektrische Abtastvorrichtungen für den Flüssigkeitsstand in zylindrischen Röhren bekannt, l>ei denen die mit Flüssigkeit gefüllte Röhre die Wirkung einer Zylinderlinse ausübt. Dadurch steigt im Bereich der Flüssigkeit die Lichtintensität auf einem der Lichtquelle gegenüber angeordneten lichtelektrischen Indikator. Der dadurch erzeugte Fotostrom wird zur Steuerung einer Motorkupplung ίο verwendet. Damit erfolgt der Nachlauf des optischen Systems in die Höhe des Meniskus der Flüssigkeitssäule.Photoelectric scanning devices for the liquid level in cylindrical tubes are known, in which the tube filled with liquid is known exerts the effect of a cylinder lens. This increases the light intensity in the area of the liquid on a photoelectric indicator arranged opposite the light source. The one generated thereby Photocurrent is used to control a motor clutch ίο. This is followed by the after-run of the optical System at the level of the meniscus of the liquid column.
Diese bekannte Anordnung hat zwei Nachteile: Einmal können nur verhältnismäßig klare Flüssigkeiten die erforderliche Lichtintensität auf dem licht- elektrischen Indikator sammeln. Zum andern ist die Steuerung einer Kupplung wegen des dieser Anordnung anhaftenden Schlupfes für exakte Messungen zu ungenau.This known arrangement has two disadvantages: On the one hand, only relatively clear liquids can produce the required light intensity on the light- collect electrical indicator. On the other hand, the control of a clutch is necessary for exact measurements because of the slip inherent in this arrangement too imprecise.
Um die erwähnten Nachteile zu beheben, wird er- ao findungsgemäß vorgeschlagen, die Lichtänderung am lichtelektrischen Indikator in einem bestimmten Intervall der Höhe der Flüssigkeitssäule auszunutzen, um die elektronische Steuerung des Motors der Abtastvorrichtung zu ermöglichen. Zu diesem Zweck as trägt die vor dem lichtelektrischen Indikator liegende Kondensorlinse einen mittleren Abdeckstreifen, der parallel zur zylindrischen Röhre verläuft. Befindet sich die Abtastvorrichtung oberhalb des Flüssigkeitsspiegels in der Röhre, so kann genügend Licht seitlich des mittleren Abdeckstreifens durch die Kondensorlinse hindurchtreten und auf den lichtelektrischen Indikator fallen. Damit wird das Nachlaufen der Abtastvorrichtung eingeleitet. Gelangt das optische System der Abtastvorrichtung in den Bereich des Meniskus der Flüssigkeitssäule, so wird immer mehr Licht durch die vorhandene Flüssigkeit im Bereich des mittleren Abdeckstreifens gesammelt und es fällt weniger Licht seitlich des Abdeckstreifens vorbei auf den lichtelektrischen Indikator. Schließlich gelangt so wenig Licht auf den lichtelektrischen Indikator, daß der Motor der Abtastvorrichtung stillgesetzt wird. Der Wert der Lichtintensität zum Stillsetzen des Motors kann regelbar sein.In order to remedy the disadvantages mentioned, it is proposed according to the invention that the light change on to use the photoelectric indicator in a certain interval of the height of the liquid column, to enable electronic control of the motor of the scanner. For this purpose as the condenser lens in front of the photoelectric indicator carries a central cover strip, the runs parallel to the cylindrical tube. If the scanning device is located above the liquid level in the tube, sufficient light can pass through the condenser lens to the side of the central cover strip and fall onto the photoelectric indicator. This is the after-run the scanning device initiated. If the optical system of the scanning device reaches the area of the meniscus of the liquid column, then more and more light is collected by the liquid present in the area of the middle cover strip and less light falls on the photoelectric indicator past the side of the cover strip. Finally, so little light reaches the photoelectric indicator that the motor of the scanner is stopped. The value of the light intensity to stop the motor can be adjustable.
Enthält die Röhre statt einer klaren eine trül>e oder eine lichtundurchlässige Flüssigkeit, so deckt diese den lichtelektrischen Indikator so weit ab, daß die gleiche Wirkung erzielt wird.If the tube contains a cloudy or opaque liquid instead of a clear one, then it covers this the photoelectric indicator so far that the same effect is achieved.
I >ic Erfindung ist in einem Ausführungsl>eispiel in den Zeichnungen dargestellt. Es zeigtThe invention is shown in one embodiment in the drawings. It shows
Fig. 1 einen Vertikalschnitt durch das optische System und die die Flüssigkeit enthalten.Ie Kiilirc undFig. 1 is a vertical section through the optical system and containing the liquid. Ie Kiilirc and
Fig. 2 einen \ ertikaLchnitt in Richtung FIG. 2 is a vertical section in the direction of ti ti h durch E.g. 1. h by Eg 1.
Abtastvorrichtung für Flüssigkeitsstände in zylindrischen RöhrenSensing device for liquid levels in cylindrical tubes
Anmelder:Applicant:
Sartorius - Werke Aktiengesellschaft (und vormals Göttinger Präzisionswaagenfabrik G.m.b.H.), Göttingen, Weender Landstr. 69/102Sartorius - Werke Aktiengesellschaft (and previously Göttinger Präzisionswaagenfabrik G.m.b.H.), Göttingen, Weender Landstr. 69/102
Dr.-Phys. Arndt v. Lüpke, Göttingen, ist als Erfinder genannt wordenDr.-Phys. Arndt v. Lüpke, Göttingen, has been named as the inventor
1 ist eine Röhre aus Glas oder Kunststoff, die im Innern die Flüssigkeit 2 aufnimmt, deren Stand bestimmt werden soll. Zu diesem Zweck muß das Absinken des Flüssigkeitsspiegels la a1>getastet werden. Hierzu dient eine in vertikaler Richtung bewegbare optische Einrichtung, bestehend aus einer Lichtquelle 3, einer Sammellinse 4 vor der Röhre 1. einer SammellinseS hinter der Röhre 1 und einem lichtelektrischen Indikator 6. Die Sammellinse 5 ist erfindungsgemäß auf ihrer einen Fläche mit einem Ab deckstreifen 7 versehen, der parallel zur Röhre 1 verläuft.1 is a tube made of glass or plastic that holds the liquid 2 inside, the level of which is to be determined. For this purpose, the drop in the liquid level la a1> must be sensed. For this purpose, a vertically movable optical device, consisting of a light source 3, a converging lens 4 in front of the tube 1, a converging lens behind the tube 1 and a photoelectric indicator 6 which runs parallel to the tube 1.
Die Wirkungsweise ist folgende: Der Motorstrom wird proportional dem Strom des lichtelektrische!! Indikators geregelt. Befindet sich die optische Ab tastvorrichtung 3 bis 6 in einer Höhe der Röhret, in deren Bereich keine Flüssigkeit enthalten ist. so erfährt der von der Lichtquelle 3 kommende Lichtstrahl nur eine geringe Streuung. Es fällt genügend Licht seitlich an dem Abdeckstreifen 7 vorln-i auf den lichtelektrischen Indikator 6. Damit erhält der Motoi der Abtastvorrichtung einen entsprechenden Antriel' für (lie Abwärtsbewegung des ganzen Systems < ic langt das optische System nahezu in IIoIk «U^ Meniskus 2a, so wirkt bei klaren Flüssigkeiten dci Hiissigkeitsgefullte Teil der Röhre 1 .iL X\Imdei linse. Das auf dem Blendenstreifcn 7 koii/cnti iei te Licht kann nicht auf den lichtelektrischen Indikator 6 fallen. Die Belichtung des lichtelektrische!! Indi kators 6 nimmt ab. und der Lauf des durch den Kotostroni geregelten Motors verlangsamt sich In-· ei Ικ-i einem von vornherein eingestellten Weit dei Lichtintensität auf dem lichtelektrischen Indikator 6 zum Stillstand kommt.The mode of operation is as follows: The motor current is proportional to the current of the photoelectric !! Indicator regulated. The optical scanning device 3 to 6 is located at a height of the tube, in the area of which no liquid is contained. so the light beam coming from the light source 3 experiences only a slight scattering. Sufficient light falls on the side of the cover strip 7 in front of the photo-electric indicator 6. The moto of the scanning device thus receives a corresponding drive for (the downward movement of the entire system <ic the optical system reaches almost into the meniscus 2a, Thus, in the case of clear liquids, the hot-filled part of the tube 11 acts as a function of the lens. The light concentrated on the diaphragm strip 7 cannot fall on the photoelectric indicator 6. The exposure of the photoelectric indicator 6 decreases. and the running of the motor regulated by the Kotostroni slows down in-· ei Ικ-i a previously set distance when the light intensity on the photoelectric indicator 6 comes to a standstill.
t>&t in t>& t in
Claims (2)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1070838B true DE1070838B (en) |
Family
ID=595638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT1070838D Pending DE1070838B (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1070838B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3411083A1 (en) * | 1984-03-26 | 1985-09-26 | BFW Ditschun GmbH Büro für Wärmemeßtechnik, 4800 Bielefeld | Device for reading heating costs allocators |
| DE3416178A1 (en) * | 1984-05-02 | 1985-11-07 | Friedhelm 4800 Bielefeld Hanning | Level meter with photoelectric meniscus reading |
| DE3417023A1 (en) * | 1984-05-09 | 1985-11-21 | Wolfgang Dr. 7000 Stuttgart Ruhrmann | Sensor for measuring the level of a liquid |
-
0
- DE DENDAT1070838D patent/DE1070838B/de active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3411083A1 (en) * | 1984-03-26 | 1985-09-26 | BFW Ditschun GmbH Büro für Wärmemeßtechnik, 4800 Bielefeld | Device for reading heating costs allocators |
| DE3416178A1 (en) * | 1984-05-02 | 1985-11-07 | Friedhelm 4800 Bielefeld Hanning | Level meter with photoelectric meniscus reading |
| DE3417023A1 (en) * | 1984-05-09 | 1985-11-21 | Wolfgang Dr. 7000 Stuttgart Ruhrmann | Sensor for measuring the level of a liquid |
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