DE4234021A1 - Ion sensitive single rod measurement chain for ion concn. measurement - has reference system with bridge and inner electrolytes in chambers formed in hollow cylinder, and movable casing with seals - Google Patents
Ion sensitive single rod measurement chain for ion concn. measurement - has reference system with bridge and inner electrolytes in chambers formed in hollow cylinder, and movable casing with sealsInfo
- Publication number
- DE4234021A1 DE4234021A1 DE19924234021 DE4234021A DE4234021A1 DE 4234021 A1 DE4234021 A1 DE 4234021A1 DE 19924234021 DE19924234021 DE 19924234021 DE 4234021 A DE4234021 A DE 4234021A DE 4234021 A1 DE4234021 A1 DE 4234021A1
- Authority
- DE
- Germany
- Prior art keywords
- reference system
- hollow cylinder
- chambers
- ion
- electrolytes
- 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.)
- Withdrawn
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
- G01N27/403—Cells and electrode assemblies
- G01N27/4035—Combination of a single ion-sensing electrode and a single reference electrode
-
- 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
- G01N27/283—Means for supporting or introducing electrochemical probes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
Die Erfindung betrifft Einrichtungen, bei denen die Galvanispannung an einer ionensensitiven Membran von der Konzentration der betreffenden Ionenart in der umgebenden Lösung abhängig ist. Diesen Effekt nutzt man zur Konzentrationsmessung der Ionen, wobei der Stromkreis über die Lösung mit einem Elektrodensystem möglichst konstanter Galvanispannung in einem speziellen Bezugselektrolyten, dem sogenannten Referenzsystem geschlossen werden muß. Zwischen der zu messenden Lösung und dem Bezugselektrolyten befindet sich ein Diaphragma (meist ein feinporöser Körper), das elektrischen Kontakt herstellen, aber einen Stoffaustausch verhindern soll. Sind alle diese Komponenten mechanisch in einem Stab verbunden, so spricht man von einer Einstabmeßkette.The invention relates to devices in which the galvanic voltage on an ion sensitive membrane of concentration the type of ion in question in the surrounding solution is dependent. This effect is used to measure concentration of the ions, the circuit over the solution with an electrode system of as constant as possible galvanic voltage in a special reference electrolyte, the so-called Reference system must be closed. Between the solution to be measured and the reference electrolyte a diaphragm (usually a fine-pored body), the electrical one Establish contact, but prevent mass transfer should. All of these components are mechanical in one rod connected, one speaks of a combination electrode.
Wenn die Gefahr besteht, daß die Lösung, deren Konzentration gemessen werden soll und der Bezugselektrolyt miteinander reagieren und die Reaktionsprodukte das Diaphragma verstopfen oder durch austretenden Bezugelektrolyten das Meßergebnis verfälscht wird, so schaltet man einen nicht reagierenden, sogenannten Brückenelektrolyten mit einem zweiten Diaphragma dazwischen (Deutsches Gebrauchsmuster 84 09 810; Oehme, Ionenselektive Elektroden, Heidelberg 1986, S. 28).If there is a risk that the solution, its concentration should be measured and the reference electrolyte with each other react and the reaction products clog the diaphragm or the result of the reference electrolyte leaking out is falsified, you switch an unresponsive, so-called bridge electrolytes with a second Diaphragm in between (German utility model 84 09 810; Oehme, Ion-selective electrodes, Heidelberg 1986, p. 28).
Die an den zusätzlichen Grenzflächen auftretenden Galvanispannungen sollen selbstverständlich genauso konstant, d. h. von der Konzentration der umgebenden Lösung unabhängig sein, wie diejenigen des eigentlichen Referenzsystems.The galvanic voltages occurring at the additional interfaces should of course be just as constant, d. H. regardless of the concentration of the surrounding solution be like those of the actual reference system.
Überraschend wurde nun gefunden, daß die zeitliche Konstanz eines solchen Referenzsystems verbessert wird, wenn der sogenannte "innere" Bezugselektrolyt und der Brückenelektrolyt während der Messung belüftet werden. It has now surprisingly been found that the temporal constancy of such a reference system is improved if the so-called "inner" reference electrolyte and the bridge electrolyte be ventilated during the measurement.
Nun ist es zwar naheliegend, die Kammern zur Aufnahme der Elektrolyten bzw. der Kontaktierungsflüssigkeit mit Bohrungen und Verschlußstopfen zu versehen, um die genannten Flüssigkeiten nachzufüllen oder auszutauschen. Diese wird man jedoch ansonsten stets geschlossen halten, so daß oben erwähnte vorteilhafte Wirkung nicht eintreten kann.Now it is obvious that the chambers for receiving the Electrolyte or the contacting liquid Bores and plugs to provide the above Refill or replace liquids. This will otherwise you always keep closed, so that above mentioned beneficial effect can not occur.
Läßt man die Bohrungen jedoch zufällig bzw. unbeabsichtigt offen, so können beim Transport oder Umrüsten der Meßeinrichtung die genannten Flüssigkeiten auslaufen.However, if the holes are left accidentally or unintentionally open, so when transporting or converting the measuring device the liquids mentioned leak.
Der Erfindung liegt die Aufgabe zugrunde, eine ionensensitive Einstabmeßkette der genannten Art zu schaffen, deren Elektrolyten des Referenzsystems während der Messung durch einen einfachen Handgriff mit der Außenluft in Verbindung gebracht und während Transport und Umrüstung der Meßanordnung ebenso einfach unter strikter Trennung der beiden Elektrolyten voneinander verschlossen werden können.The invention has for its object an ion-sensitive To create combination electrodes of the type mentioned, whose Electrolytes of the reference system during the measurement a simple handle in connection with the outside air brought and during transport and retrofitting the measuring arrangement just as simple with strict separation of the two electrolytes can be closed from each other.
Diese Aufgabe wird durch die in den Patentansprüchen beschriebene Einstabmeßkette gelöst. Durch einfaches Verschieben der Hülse kann zwischen den Phasen "Messung" sowie "Umrüstung und Transport" gewechselt werden, wobei in der letzteren Phase durch den mittleren Runddichtring eine strikte Trennung von innerem und Brückenelektrolyt des Referenzsystems gewährleistet ist.This object is achieved by the one described in the claims Combination electrode released. By simply moving it the sleeve can be between the phases "measurement" and "retrofitting and transport "can be changed, whereby in the the latter phase through the central O-ring strict separation of the internal and bridge electrolyte of the Reference system is guaranteed.
Bei der vorteilhaften Ausführungsform der Erfindung nach Anspruch 4 ist der meßtechnisch wichtige Temperaturfühler gegenüber allen drei Füllflüssigkeiten der Einstabmeßkette abgedichtet und dennoch in engem thermischen Kontakt mit ihnen angeordnet.In the advantageous embodiment of the invention according to claim 4 is the temperature sensor that is important for measurement compared to all three filling liquids in the combination electrode sealed and yet in close thermal contact with arranged them.
Die Erfindung wird nachstehend an Hand eines Ausführungsbeispiels näher erläutert. Die beigefügten Zeichnungen stellen dar:The invention is described below using an exemplary embodiment explained in more detail. Make the attached drawings represents:
Fig. 1: einen axialen Längsschnitt durch eine erfindungsgemäße Einrichtung und Fig. 1: an axial longitudinal section through an inventive device and
Fig. 2: einen Querschnitt am abgebrochenen oberen Ende der Einrichtung nach Fig. 1. Fig. 2 is a cross-section at the upper end of the broken-off device according to Fig. 1.
Ein Hohlzylinder 1 aus Plastwerkstoff mit angeformten Längstrennwänden 2 und 3 bildet den Grundkörper der Einstabmeßkette. In der Kammer 4 befindet sich eine KCl-Lösung 5, die zusammen mit einer Membran 6 aus PVC, die in die nicht dargestellte zu messende Lösung taucht, die zu messende Galvanispannung ausbildet. Zur Verdeutlichung anderer Einzelheiten wurde der in Kammer 4 eintauchende Membrananschluß ebenso weggelassen, wie die in eine KCl-Lösung 7 in einer Kammer 8 eintauchende Referenzelektrode. Über ein Diaphragma 9 steht der innere Elektrolyt 7 in Verbindung mit einer Lithiumacetatlösung 10 als Brückenelektrolyt in der Kammmer 11 und diese wiederum über ein Diaphragma 12 mit der zu messenden Lösung, die mit dem Lithiumacetat keine chemischen Reaktionen eingeht.A hollow cylinder 1 made of plastic material with integrally formed longitudinal partitions 2 and 3 forms the basic body of the combination electrode. In the chamber 4 there is a KCl solution 5 which, together with a membrane 6 made of PVC, which is immersed in the solution not shown, forms the galvanic voltage to be measured. To clarify other details, the membrane connection immersed in chamber 4 was omitted, as was the reference electrode immersed in a KCl solution 7 in chamber 8 . Via a diaphragm 9 , the inner electrolyte 7 is connected to a lithium acetate solution 10 as a bridge electrolyte in the chamber 11 and this in turn via a diaphragm 12 to the solution to be measured, which does not undergo any chemical reactions with the lithium acetate.
In unterschiedlicher Höhe befinden sich je eine Bohrung 13 in der Außenwand der Kammer 8 bzw. 14 in der Außenwand der Kammer 11. Drei Runddichtringe 15 sind in Rillen einer Hülse 16 eingelegt und verschließen in der dargestellten Transport-Stellung der Hülse 16 die Lösungen 7 und 10 sicher gegeneinander und nach außen. Beim Meßbetrieb wird die Hülse 16 einfach an den unteren Anschlag des Hohlzylinders 1 verschoben und gibt die Bohrungen 13 und 14 frei, wodurch die Lösungen 7 und 10 Verbindung zur Außenluft erhalten, was erfindungswesentlich ist.At different heights there are holes 13 in the outer wall of the chamber 8 and 14 in the outer wall of the chamber 11 . Three round sealing rings 15 are inserted into the grooves of a sleeve 16 and, in the illustrated transport position of the sleeve 16, securely close the solutions 7 and 10 against one another and to the outside. During measuring operation, the sleeve 16 is simply moved to the lower stop of the hollow cylinder 1 and exposes the bores 13 and 14 , whereby the solutions 7 and 10 receive connection to the outside air, which is essential to the invention.
An der Mantellinie, wo sich an der Innenwand des Hohlzylinders 1 die Längstrennwände 2 und 3 treffen, ist ein Thermoelement 17 als Temperaturfühler eingelassen.At the surface line, where the longitudinal partitions 2 and 3 meet on the inner wall of the hollow cylinder 1 , a thermocouple 17 is embedded as a temperature sensor.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924234021 DE4234021A1 (en) | 1992-10-09 | 1992-10-09 | Ion sensitive single rod measurement chain for ion concn. measurement - has reference system with bridge and inner electrolytes in chambers formed in hollow cylinder, and movable casing with seals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924234021 DE4234021A1 (en) | 1992-10-09 | 1992-10-09 | Ion sensitive single rod measurement chain for ion concn. measurement - has reference system with bridge and inner electrolytes in chambers formed in hollow cylinder, and movable casing with seals |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4234021A1 true DE4234021A1 (en) | 1994-04-14 |
Family
ID=6470037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19924234021 Withdrawn DE4234021A1 (en) | 1992-10-09 | 1992-10-09 | Ion sensitive single rod measurement chain for ion concn. measurement - has reference system with bridge and inner electrolytes in chambers formed in hollow cylinder, and movable casing with seals |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4234021A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006106071A1 (en) * | 2005-04-08 | 2006-10-12 | Hach Lange Gmbh | Wastewater analysis sensor cartridge |
WO2009055295A1 (en) * | 2007-10-23 | 2009-04-30 | Hach Company | Ionic probe including an extrudable conductive junction material |
DE102009003042A1 (en) | 2008-06-20 | 2009-12-24 | Metroglas Ag | Closing device for liquid reservoir in electro-chemical electrode and measuring system, has recess partly congruently positioned with refilling opening by bringing device into position relative to liquid reservoir in installed condition |
US7967963B2 (en) | 2005-04-08 | 2011-06-28 | Hach Lange Gmbh | Wastewater analysis sensor cartridge |
-
1992
- 1992-10-09 DE DE19924234021 patent/DE4234021A1/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006106071A1 (en) * | 2005-04-08 | 2006-10-12 | Hach Lange Gmbh | Wastewater analysis sensor cartridge |
CN101151527B (en) * | 2005-04-08 | 2011-02-09 | 哈克兰格有限责任公司 | Wastewater analysis sensor cartridge |
US7967963B2 (en) | 2005-04-08 | 2011-06-28 | Hach Lange Gmbh | Wastewater analysis sensor cartridge |
WO2009055295A1 (en) * | 2007-10-23 | 2009-04-30 | Hach Company | Ionic probe including an extrudable conductive junction material |
DE102009003042A1 (en) | 2008-06-20 | 2009-12-24 | Metroglas Ag | Closing device for liquid reservoir in electro-chemical electrode and measuring system, has recess partly congruently positioned with refilling opening by bringing device into position relative to liquid reservoir in installed condition |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8127 | New person/name/address of the applicant |
Owner name: TRIDELTA GMBH, 07629 HERMSDORF, DE |
|
8139 | Disposal/non-payment of the annual fee |