DE920517C - Liquid manometer, especially for Warburg apparatus - Google Patents
Liquid manometer, especially for Warburg apparatusInfo
- Publication number
- DE920517C DE920517C DEB23222A DEB0023222A DE920517C DE 920517 C DE920517 C DE 920517C DE B23222 A DEB23222 A DE B23222A DE B0023222 A DEB0023222 A DE B0023222A DE 920517 C DE920517 C DE 920517C
- Authority
- DE
- Germany
- Prior art keywords
- capillaries
- warburg apparatus
- liquid
- warburg
- liquid manometer
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/18—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Description
Beim Arbeiten mit Flüssigkeitsmanometern, insbesondere solchen, die für Warburg-Apparate bestimmt sind, wurde allgemein der Übelstand empfunden, daß der jeweilige Flüssigkeitsspiegel infolge Kapillarwirkung oftmals den tatsächlichen Druckverhältnissen nicht entspricht oder zumindest nicht eindeutig abgelesen werden kann. Diese Kapillarwirkungen bzw. Fehlerquellen sind bekanntlich um so größer, je geringer der Querschnitt der Flüssigkeitssäule, d. h. je enger die Kapillare ist. Um aber, wie bei den bereits erwähnten Warburg-Apparaten, minimale Gasdruckänderungen, die häufig nur in der Größenordnung eines Millimeters Wassersäule liegen, überhaupt erfassen zu können, sind jedoch naturgemäß gerade Kapillaren kleinsten Querschnittes erforderlich.When working with liquid manometers, especially those for Warburg apparatus are determined, the disadvantage was generally felt that the respective liquid level often does not correspond or at least does not correspond to the actual pressure conditions due to capillary action cannot be clearly read. These capillary effects or sources of error are known the larger, the smaller the cross-section of the liquid column, d. H. the narrower the capillary is. However, in order, as with the Warburg apparatus already mentioned, minimal changes in gas pressure, which are often only in the order of a millimeter of water, can even be recorded can, but naturally straight capillaries with the smallest cross-section are required.
Man hat daher bereits Flüssigkeiten, wie z. B. die Brodiesche Lösung, vorgeschlagen, welche weder einen positiven noch einen negativen Meniskus in Glasröhren erzeugt und daher selbst in engsten Kapillaren eine Fehlablesung vermeiden soll. Diese Lösung hat jedoch den Nachteil, unbeständig zu sein und sich nach mehr oder weniger langem Gebrauch zu zersetzen, was schließlich zu einer Verschmutzung oder gar zu einer Verstopfung der Kapillaren und somit zu deren völliger Unbrauchbarkeit führt.You therefore already have liquids such. B. the Brodyche solution suggested which produces neither a positive nor a negative meniscus in glass tubes and therefore even in the narrowest Capillaries should avoid incorrect reading. However, this solution has the disadvantage of being inconsistent to be and to decompose after more or less prolonged use, ultimately resulting in a Soiling or even clogging of the capillaries and thus making them completely unusable leads.
Von diesen Erfahrungen ausgehend, beruht die Erfindung in der Erkenntnis, daß die an sich bekannte Methode, Glas durch einen Siliconüberzug unbenetzbar zu machen, auch für Glaskapillaren anwendbar ist, sofern man durch die zuvor gereinig-Proceeding from these experiences, the invention is based on the knowledge that the known per se Method of making glass non-wettable with a silicone coating, also for glass capillaries is applicable, provided that the previously cleaned
ten Kapillaren Dimethyldichlorsilan oder analoge Silane in einem entsprechenden Lösungsmittel, wie Benzol, hindurchleitet, z. B. durchsaugt, und anschließend Luft üblicher Raumfeuchtigkeit hindurchtreibt, so daß das Lösungsmittel verdampft und das zurückbleibende Silan zu einem dünnen Überzug hydratisiert wird, den man im Idealfall als eine monomolekulare Schicht ansprechen könnte. Auf diese Weise wird gemäß der Erfindung dieten capillaries dimethyldichlorosilane or analogous silanes in an appropriate solvent, such as Benzene, e.g. B. soaks through, and then drives air with normal room humidity through it, so that the solvent evaporates and the remaining silane becomes a thin Coating is hydrated, which one could ideally refer to as a monomolecular layer. In this way, according to the invention, the
ίο Möglichkeit geschaffen, statt der Brodieschen Lösung beständige Sperrflüssigkeiten, wie z. B. wäßrige Lösunigen, zu verwenden, die man zweckmäßigerweise einfärbt und mit einem den Dampfdruck erniedrigenden Zusatz versieht. Darüber hinaus bietet die Erfindung den großen Vorteil, daß man den Querschnitt der Kapillaren noch wesentlich verringern und somit die Empfindlichkeit der Manometer entsprechend erhöhen kann, weil keinerlei Gefahr mehr besteht, daß die Kapillaren durch irgendwelche Zersetzungsprodukte der Sperrflüssigkeit verunreinigt oder verstopft werden.ίο Possibility created instead of the brodies Solution resistant barrier fluids, such as. B. aqueous solutions to use, which one expediently colored and provided with an additive that lowers the vapor pressure. About that In addition, the invention offers the great advantage that the cross section of the capillaries is still can significantly reduce and thus increase the sensitivity of the pressure gauge accordingly, because there is no longer any risk of the capillaries being damaged by any decomposition products the sealing liquid become contaminated or clogged.
Die Erfindung ist nicht auf Flüssigkeitsmanometer beschränkt, sondern auch für andere, Anzeigekapillaren aufweisende Meßinstrumente, ζ. Β. für Thermometer, geeignet.The invention is not restricted to liquid manometers, but also to other measuring instruments having display capillaries, ζ. Β. for Thermometer, suitable.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB23222A DE920517C (en) | 1952-12-06 | 1952-12-06 | Liquid manometer, especially for Warburg apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB23222A DE920517C (en) | 1952-12-06 | 1952-12-06 | Liquid manometer, especially for Warburg apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
DE920517C true DE920517C (en) | 1954-11-25 |
Family
ID=6961126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB23222A Expired DE920517C (en) | 1952-12-06 | 1952-12-06 | Liquid manometer, especially for Warburg apparatus |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE920517C (en) |
-
1952
- 1952-12-06 DE DEB23222A patent/DE920517C/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE920517C (en) | Liquid manometer, especially for Warburg apparatus | |
DE1057798B (en) | Automatic measuring device to determine the specific surface of irregularly shaped substances | |
DE2229135A1 (en) | Anion selective electrode | |
DE661983C (en) | Technical heat consumption meter | |
DE930013C (en) | Filler holder | |
DE415724C (en) | Spirit dragonfly | |
CH258027A (en) | Transparent drawing angle. | |
DE537633C (en) | Process for the production of a largely stable, easily processable lithium beryllium borate glass | |
DE691588C (en) | Double thermometer for psychrometer | |
DE939596C (en) | Climatic chamber for testing machines | |
DE7127058U (en) | Device for humidifying an air stream | |
AT141373B (en) | Smoke and mist filters. | |
DE403493C (en) | Arrangement to take into account the absorbing influence of human body layers in the intensity and hardness measurement of X-rays | |
DE371906C (en) | Automatic recording instrument for measuring water depths, water speeds and flow rates | |
DE513772C (en) | Capillary for measuring the surface or interfacial tension | |
DE674309C (en) | Process for increasing the measurement accuracy of air weight cells | |
DE439193C (en) | Bottle with a frame formed by a rib or the like | |
DE600648C (en) | Flow meter | |
DE397643C (en) | Device for measuring and automatic recording of pressure states | |
AT53945B (en) | Manometer. | |
DE2207008A1 (en) | Preventing glass spotting - using volatile org acids | |
DE740737C (en) | Device for recording coordinates on a running recording strip | |
DE377546C (en) | Screw gauge | |
DE1546499A1 (en) | Single-layer lens, especially for respirators, diving masks or the like. Made of transparent plastic | |
DE1113596B (en) | Carbon oxide indicator |