DE10351682A1 - Electrical pH measurement system has either an extra pH-electrode or an extra reference electrode so that measurements can be checked against each other to determine if calibration is necessary - Google Patents
Electrical pH measurement system has either an extra pH-electrode or an extra reference electrode so that measurements can be checked against each other to determine if calibration is necessary Download PDFInfo
- Publication number
- DE10351682A1 DE10351682A1 DE10351682A DE10351682A DE10351682A1 DE 10351682 A1 DE10351682 A1 DE 10351682A1 DE 10351682 A DE10351682 A DE 10351682A DE 10351682 A DE10351682 A DE 10351682A DE 10351682 A1 DE10351682 A1 DE 10351682A1
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- Germany
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- electrodes
- electrode
- measuring system
- calibration
- extra
- 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.)
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Classifications
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- 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
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
- G01N27/4165—Systems checking the operation of, or calibrating, the measuring apparatus for pH meters
Abstract
Description
pH-Sensoren sind wie andere ionenselektive Sensoren in zeitlichen Abständen zu Warten und auf ihre Steilheit mittels Kalibrierung durch bekannte Eichlösungen zu prüfen. Ursachen dafür können Verunreinigung an den Oberflächen der Sensormembran bzw. des Diaphragmas der Referenzelektrode, chemische Veränderungen der Membranen selbst oder deren inneren Ableitsysteme sein. Entscheidend dabei ist, dass Veränderungen im gesamten Sensorsystem, die zur Messverfälschung führen können, rechtzeitig erkannt werden bzw. durch zyklische Kalibrierung ständig neu bewertet und im Messergebnis berücksichtigt wird. Dieser Kalibrierungsvorgang wird je Einsatz der Sensoren manuell bzw. automatisiert durchgeführt.pH sensors are like other ion-selective ones Sensors in time intervals to wait and for their steepness by calibration by known calibration solutions to consider. Causes of this can Contamination on the surfaces the sensor membrane or the diaphragm of the reference electrode, chemical changes of the membranes themselves or their internal drainage systems. critical is that changes in the entire sensor system, which can lead to measurement errors, can be recognized in good time or constantly re-evaluated by cyclical calibration and in the measurement result considered becomes. This calibration process is manual depending on the use of the sensors or carried out automatically.
Beim Einsatz von Sensoren mit manueller Kalibrierung/Wartung besteht bei zu geringer Wartung die Gefahr, daß die Sensoren falsche Messergebnisse liefern und bei zu häufiger Wartung der Service- und Betriebskostenaufwand sehr groß wird. Die optimale Variante kann bei laufenden Messprozessen nur durch langjährige empirische Erfahrungen des Wartungspersonales ermittelt werden.When using sensors with manual Calibration / maintenance, if maintenance is too low, there is a risk that the Sensors deliver incorrect measurement results and maintenance is too frequent the service and operating costs are very high. The optimal variant can only with ongoing measurement processes through many years of empirical experience maintenance personnel.
Diese Nachteile zu beheben und eine manuelle Kalibrierung/Wartung nur dann durchzuführen, wenn diese erforderlich wird, ist Gegenstand der folgenden Erfindung.To fix these disadvantages and one manual calibration / maintenance only to be carried out if required is the subject of the following invention.
Das pH-Messsystem besteht zum Unterschied zu anderen pH-Messsystemen nicht nur aus einer Referenzelektrode sondern aus mindestens zwei oder mehreren Referenzelektroden, die als inneren Referenzelektrolyten einen pH-Unterschied aufweisen. Die pH-Elektrode ist weiterhin als Bezugssystem zu sehen, indem die unterschiedlichen Referenzelektroden gegen das Bezugssystem bewertet werden. Unter der Voraussetzung, daß pH-stabile Referenzelektrolyte verwendet werden, entstehen bei jeder pH-Messung mit dem Meßsystem und an jeder Referenzelektrode Spannungen die Parallel, im gleichen Anstieg, und um einen festen pH-Wert zueinander verschoben, verlaufen. Dieser pH-Unterschied ist dabei die pH-Differenz zwischen den pH-Werten der Referenzelektrolyten in den Referenzelektroden.The difference is in the pH measuring system to other pH measuring systems not just from a reference electrode but from at least two or more reference electrodes that have a pH difference as the internal reference electrolyte. The pH electrode can still be seen as a reference system by the different reference electrodes against the reference system become. Provided that pH stable reference electrolytes are used for each pH measurement with the measuring system and voltages parallel to each reference electrode, in the same Increase, and shifted by a fixed pH to each other. This pH difference is the pH difference between the pH values of the reference electrolytes in the reference electrodes.
Als Steilheit S für die pH-Elektrode gilt dannThe slope S for the pH electrode then applies
Damit wird es möglich unabhängig der wiederkehrenden Messaufgaben die Steilheit der pH-Elektrode ständig zu überwachen, diese zu bewerten und entsprechend deren zeitlichen Veränderung eine erforderliche manuelle Wartung und Kalibrierung zu signalisieren.This makes it possible to be independent of the recurring measurement tasks constantly monitor the slope of the pH electrode and evaluate it and a required manual according to their change over time Signal maintenance and calibration.
Dieses Verfahren kann auch dann angewendet werden, wenn die Parallelität zwischen den beiden Kennlinien der Sensorspannung 1 und Sensorspannung 2 nicht gegeben ist. In diesem Fall ist die Beschreibung der beiden Kennlinien zueinander dem Auswertesystem mittels vorheriger Kalibrierung bekannt zu geben, womit analog ständig zu hohe Abweichungen des Messsystems aus dem zulässigen Messtoleranzbereich erkannt, bewertet und signalisiert werden können.This procedure can also be used if the parallelism between the two characteristic curves of sensor voltage 1 and sensor voltage 2 is not given. In this case, the description of the two Characteristic curves to each other in the evaluation system by means of previous calibration to announce, with which analog deviations of the Measuring system from the permissible Measurement tolerance range can be recognized, evaluated and signaled.
Mit Einsatz dieses Messsystems kann auf turnusmäßige oder vorbeugende Wartung und Kalibrierung der Elektroden verzichtet werden, womit diese Arbeiten erst dann durchgeführt werden müssen, wenn diese vom Messsystem angefordert werden. Damit wird eine hohe Betriebs- und Prozesssicherheit gewährleistet, ohne komplexe Messautomationen einsetzen zu müssen.With the use of this measuring system on regular or preventive maintenance and calibration of the electrodes are dispensed with, with which this work only has to be carried out if these are requested by the measuring system. This ensures high operational and process reliability guaranteed without having to use complex measurement automation.
Die gleichzeitige Auswertung mittels mehrerer Elektrodenkennlinien kann prinzipiell auch durch die Kombination von zwei pH-Elekdroden unterschiedlicher Ableitelektrolyten und einem Referenzsystem realisiert werden. Auf diese Möglichkeit wird in den Schutzrechten verwiesen, ist aber in der Zeichnung nicht explizit aufgeführt.The simultaneous evaluation using In principle, several electrode characteristics can also be combined of two pH electrodes of different discharge electrolytes and a reference system. On this opportunity is referred to in the property rights, but is not in the drawing explicitly listed.
- 11
- pH-ElektrodepH-electrode
- 1a1a
- Glasmembranglass membrane
- 1b1b
- Messelektrolytmeasuring electrolyte
- 1c1c
- Ableitelektrodelead-out
- 22
-
Referenzelektrode
1 reference electrode1 - 2a2a
- Diaphragmadiaphragm
- 2b2 B
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Referenzelektrolyt
1 reference electrolyte1 - 2c2c
- Ableitelektrodelead-out
- 33
-
Referenzelektrode
2 reference electrode2 - 3a3a
- Diaphragmadiaphragm
- 3b3b
-
Referenzelektrolyt
2 reference electrolyte2 - 3c3c
- Ableitelektrodelead-out
- 44
- Meßwandler Sensorspannung 1transducer Sensor voltage 1
- 55
- Meßwandler Sensorspannung 2transducer Sensor voltage 2
- 66
- Auswerteeinheit für Sensorspannungenevaluation for sensor voltages
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10351682A DE10351682A1 (en) | 2002-11-08 | 2003-11-05 | Electrical pH measurement system has either an extra pH-electrode or an extra reference electrode so that measurements can be checked against each other to determine if calibration is necessary |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10252531 | 2002-11-08 | ||
DE10252531.5 | 2002-11-08 | ||
DE10351682A DE10351682A1 (en) | 2002-11-08 | 2003-11-05 | Electrical pH measurement system has either an extra pH-electrode or an extra reference electrode so that measurements can be checked against each other to determine if calibration is necessary |
Publications (1)
Publication Number | Publication Date |
---|---|
DE10351682A1 true DE10351682A1 (en) | 2004-07-15 |
Family
ID=32518785
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE10351682A Withdrawn DE10351682A1 (en) | 2002-11-08 | 2003-11-05 | Electrical pH measurement system has either an extra pH-electrode or an extra reference electrode so that measurements can be checked against each other to determine if calibration is necessary |
Country Status (1)
Country | Link |
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DE (1) | DE10351682A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009055274A1 (en) * | 2007-10-25 | 2009-04-30 | Hach Company | Ionic probe |
CN102214843A (en) * | 2010-04-08 | 2011-10-12 | 通用汽车环球科技运作有限责任公司 | Lithium-ion cell with an array of reference electrodes |
US8551311B2 (en) | 2006-09-06 | 2013-10-08 | Hach Company | Ionic probe |
-
2003
- 2003-11-05 DE DE10351682A patent/DE10351682A1/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8551311B2 (en) | 2006-09-06 | 2013-10-08 | Hach Company | Ionic probe |
WO2009055274A1 (en) * | 2007-10-25 | 2009-04-30 | Hach Company | Ionic probe |
CN102214843A (en) * | 2010-04-08 | 2011-10-12 | 通用汽车环球科技运作有限责任公司 | Lithium-ion cell with an array of reference electrodes |
CN102214843B (en) * | 2010-04-08 | 2014-12-10 | 通用汽车环球科技运作有限责任公司 | Lithium-ion cell with an array of reference electrodes |
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