DE19819555A1 - Bubble pressure tensiometer for determination of the surface tension of liquids - Google Patents

Bubble pressure tensiometer for determination of the surface tension of liquids

Info

Publication number
DE19819555A1
DE19819555A1 DE1998119555 DE19819555A DE19819555A1 DE 19819555 A1 DE19819555 A1 DE 19819555A1 DE 1998119555 DE1998119555 DE 1998119555 DE 19819555 A DE19819555 A DE 19819555A DE 19819555 A1 DE19819555 A1 DE 19819555A1
Authority
DE
Germany
Prior art keywords
capillary
surface tension
measuring
bubble pressure
cleaning
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
Application number
DE1998119555
Other languages
German (de)
Other versions
DE19819555B4 (en
Inventor
Wolf-Eberhard Heyer
Andreas Halbig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lauda Dr R Wobser GmbH and Co KG
Original Assignee
Lauda Dr R Wobser GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lauda Dr R Wobser GmbH and Co KG filed Critical Lauda Dr R Wobser GmbH and Co KG
Priority to DE1998119555 priority Critical patent/DE19819555B4/en
Publication of DE19819555A1 publication Critical patent/DE19819555A1/en
Application granted granted Critical
Publication of DE19819555B4 publication Critical patent/DE19819555B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/38—Cleaning of electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/02—Investigating surface tension of liquids
    • G01N2013/0241—Investigating surface tension of liquids bubble, pendant drop, sessile drop methods

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The measuring cell of the bubble pressure extensiometer incorporates a unit for on-line cleaning of the measuring capillary tube (3). To prevent entry of dirt particles into this tube, gas is also blown through it during the cleaning process. The on-line cleaning unit preferably takes the form of an ultrasound generator (4).

Description

Die Erfindung bezieht sich auf ein Blasendrucktensiometer zur Messung der Oberflächenspannung von Flüssigkeiten. Bei derartigen Geräten wird ein Gas in die Meßprobe eingeblasen und aus dem maximalen Blaseninnendruck die Oberflächenspannung der Probe berechnet.The invention relates to a bubble pressure tensiometer for measuring the surface tension of liquids. In such devices, a gas is blown into the test sample and out of the maximum bubble pressure the surface tension of the sample is calculated.

Das Gas wird durch eine Kapillare, deren Durchmesser im Vergleich zur Länge gering ist, in die Probe geblasen. Hierzu muß die Kapillare in die Probe eintauchen und kann demzufolge durch die Probe verschmutzt werden. Verschmutzungen an der Kapillare bewirken ein Verfälschen des Meßergebnisses. Deshalb muß die Kapillare bei der Messung unterschiedlicher Proben regelmäßig gereinigt werden. Hierzu wird die Kapillare aus dem Gerät entnommen und in eine spezielle Reinigungsvorrichtung, beispielsweise ein Ultraschallbad, gelegt und gereinigt.The gas is introduced into the sample through a capillary, the diameter of which is small compared to its length blown. For this purpose, the capillary must be immersed in the sample and can therefore pass through the sample become dirty. Contamination on the capillary falsifies the Measurement result. The capillary must therefore be used regularly when measuring different samples getting cleaned. For this purpose, the capillary is removed from the device and into a special one Cleaning device, such as an ultrasonic bath, placed and cleaned.

Die erforderliche regelmäßige Reinigung behindert den Einsatz der Blasendruckmethode bei der online-Messung. Hier muß die Oberflächenspannung kontinuierlich erfaßt werden, um Änderungen im Prozeß zu detektieren. Eine Reinigung würde die Meßwerterfassung unterbrechen. Außerdem erfordert sie qualifiziertes Personal, das an derartigen Anlagen nur begrenzt verfügbar ist.The regular cleaning required hinders the use of the bladder pressure method in the online measurement. Here the surface tension has to be recorded continuously in order to make changes in the Process to detect. Cleaning would interrupt the acquisition of measured values. Furthermore it requires qualified personnel who are only available to a limited extent on such systems.

Um diese Nachteile zu beheben wird vorgeschlagen, die Reinigungseinrichtung in den Sensor zu integrieren und in vorgebbaren Zeitabständen oder in Abhängigkeit von der Prozeßführung automatisch die Kapillare zu reinigen. Eine derartige Kombination kann auch bei Blasendrucktensiometern für den Laboreinsatz erfolgreich eingesetzt werden. Als Reinigungsvorrichtung wird vorzugsweise ein Ultraschallgeber vorgeschlagen.In order to remedy these disadvantages, it is proposed that the cleaning device be placed in the sensor integrate and at predefinable time intervals or depending on the process control automatically clean the capillary. Such a combination can also be used Bladder pressure tensometers are successfully used for laboratory use. As An ultrasonic transmitter is preferably proposed for the cleaning device.

Die erfindungsgemäße Meßzelle ist auf den Fig. 1 und 2 schematisch dargestellt. Die Fig. 1 zeigt eine Draufsicht auf eine online-Meßzelle und die Fig. 2 einen Schnitt durch die Meßzelle entlang der Linie I-I der Fig. 1.The measuring cell according to the invention is shown schematically in FIGS . 1 and 2. Fig. 1 shows a plan view of an online measuring cell, and Fig. 2 shows a section through the measuring cell taken along line II of FIG. 1.

In dem Gehäuse 1 ist ein Wehr 2 angeordnet, daß ein konstantes Flüssigkeitsniveau sichert. In dem Deckel 5 der Meßzelle ist die Meßkapillare mit Gehäuse 3 und der Ultraschallgeber fixiert. Die Meßflüssigkeit wird in Richtung des Pfeiles 6 in die Meßzelle gepumpt und das Gas zur Produktion der Blasen in Richtung des Pfeiles 7 eingeblasen. Die Meßflüssigkeit fließt in Richtung des Pfeiles 8 aus der Meßzelle, während das zur Blasenbildung eingeblasene Gas in Richtung des Pfeiles 9 abströmt.A weir 2 is arranged in the housing 1 to ensure a constant liquid level. The measuring capillary with the housing 3 and the ultrasound transmitter are fixed in the cover 5 of the measuring cell. The measuring liquid is pumped into the measuring cell in the direction of arrow 6 and the gas is blown in in the direction of arrow 7 to produce the bubbles. The measuring liquid flows out of the measuring cell in the direction of arrow 8 , while the gas blown in to form bubbles flows out in the direction of arrow 9 .

Durch den geringen Abstand zwischen der Meßkapillare und dem Reinigungsgeber ist mit geringer Leistung des Ultraschallgebers ein hoher Reinigungseffekt erzielbar. Während der Reinigung wird weiterhin Gas durch die Kapillare geblasen. Dadurch wird gesichert, daß keine Flüssigkeit und damit auch keine Verschmutzungen in die Kapillare gelangen. Die Stirnfläche der Kapillare, an der sich bei dem Betrieb des Sensors Schmutzpartikel anlagern können, wird sicher gereinigt. Due to the small distance between the measuring capillary and the cleaning device, the Power of the ultrasound generator a high cleaning effect can be achieved. During cleaning continue to blow gas through the capillary. This ensures that no liquid and therefore no dirt can get into the capillary. The end face of the capillary, at which can accumulate dirt particles during the operation of the sensor is safely cleaned.  

BezugszeichenlisteReference list

11

Gehäuse
casing

22nd

Überlauf zur Sicherung eines konstanten Flüssigkeitsniveaus
Overflow to ensure a constant liquid level

33rd

Meßkapillare mit Gehäuse
Measuring capillary with housing

44th

Ultraschallreinigungssensor
Ultrasonic cleaning sensor

55

Deckel der Meßzelle
Cover of the measuring cell

66

Pfeil
arrow

77

Pfeil
arrow

88th

Pfeil
arrow

99

Pfeil
arrow

Claims (1)

Blasendrucktensiometer zur Messung der Oberflächenspannung, bei dem ein Gas durch eine Kapillare in eine Probe eingeblasen wird, dadurch gekennzeichnet, daß in der Meßzelle des Blasendrucktensiometers eine Vorrichtung zur online-Reinigung der Kapillare vorgesehen ist und durch da Gas, das auch bei der Reinigung durch die Kapillare geblasen wird, verhindert wird, daß Schmutzteilchen in die Kapillare verschleppt werden und somit nur die Stirnfläche der Kapillare sicher gereinigt wird. Die Vorrichtung zur online-Reinigung der Kapillare ist vorzugsweise als Ultraschallgeber ausgebildet.Bladder pressure tensiometer for measuring the surface tension, in which a gas is blown into a sample through a capillary, characterized in that a device for online cleaning of the capillary is provided in the measuring cell of the bladder pressure tensiometer and by the gas which is also present in the cleaning by the Capillary is blown, it is prevented that dirt particles are carried over into the capillary and thus only the end face of the capillary is safely cleaned. The device for online cleaning of the capillary is preferably designed as an ultrasound transmitter.
DE1998119555 1998-04-30 1998-04-30 bubble pressure Expired - Fee Related DE19819555B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1998119555 DE19819555B4 (en) 1998-04-30 1998-04-30 bubble pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1998119555 DE19819555B4 (en) 1998-04-30 1998-04-30 bubble pressure

Publications (2)

Publication Number Publication Date
DE19819555A1 true DE19819555A1 (en) 1999-11-04
DE19819555B4 DE19819555B4 (en) 2010-10-28

Family

ID=7866426

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1998119555 Expired - Fee Related DE19819555B4 (en) 1998-04-30 1998-04-30 bubble pressure

Country Status (1)

Country Link
DE (1) DE19819555B4 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002084255A1 (en) * 2001-04-12 2002-10-24 Kibron Inc. Oy Method and device for the cleaning of a sensor that measures surface tension
DE10308198B3 (en) * 2003-02-25 2004-07-22 Miele & Cie. Kg Surface tension determination method for tenside solution, e.g. a washing solution, using bubble pressure method
CN101799392A (en) * 2010-02-11 2010-08-11 奚明 Portable surface tension tester
RU2554637C1 (en) * 2013-12-09 2015-06-27 Сергей Александрович Акопян Surface tension measurement method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529787B4 (en) * 1995-08-12 2011-05-19 E.G.O. Elektro-Gerätebau GmbH Method and device for level-independent measurement of the surface tension of liquid substances
DE19603386A1 (en) * 1996-01-31 1997-08-07 Lauda Dr R Wobser Gmbh & Co Kg Measurement and control of surfactant solution surface tension using bubble excess pressure tensiometer
DE29609646U1 (en) * 1996-05-31 1996-08-14 Technische Universität Dresden, 01069 Dresden Device for the dynamic measurement of the surface tension of a liquid
DE19653752C2 (en) * 1996-12-20 2003-08-07 Sita Messtechnik Gmbh Method and device for cleaning process measuring cells with capillaries

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002084255A1 (en) * 2001-04-12 2002-10-24 Kibron Inc. Oy Method and device for the cleaning of a sensor that measures surface tension
DE10308198B3 (en) * 2003-02-25 2004-07-22 Miele & Cie. Kg Surface tension determination method for tenside solution, e.g. a washing solution, using bubble pressure method
US6915680B2 (en) 2003-02-25 2005-07-12 Miele & Cie. Kg Method and system for determining surface tension using the bubble pressure method
CN101799392A (en) * 2010-02-11 2010-08-11 奚明 Portable surface tension tester
RU2554637C1 (en) * 2013-12-09 2015-06-27 Сергей Александрович Акопян Surface tension measurement method

Also Published As

Publication number Publication date
DE19819555B4 (en) 2010-10-28

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Effective date: 20141101