WO2004051246A2 - Sensorsteckkopf insbesondere für einen potentiometrischen sensor und potentiometrischer sensor mit sensorsteckkopf - Google Patents
Sensorsteckkopf insbesondere für einen potentiometrischen sensor und potentiometrischer sensor mit sensorsteckkopf Download PDFInfo
- Publication number
- WO2004051246A2 WO2004051246A2 PCT/EP2003/013274 EP0313274W WO2004051246A2 WO 2004051246 A2 WO2004051246 A2 WO 2004051246A2 EP 0313274 W EP0313274 W EP 0313274W WO 2004051246 A2 WO2004051246 A2 WO 2004051246A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- plug head
- electrolyte
- potentiometric
- connection
- 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.)
- Ceased
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
Definitions
- the present invention relates to sensors which require a liquid substance as a reference or as a calibration solution.
- sensors include, for example, potentiometric sensors, in particular pH sensors or redox sensors, the example of which is used to explain the invention below, without being restricted thereto.
- the present invention relates to a sensor head for a potentiometric sensor.
- Potentiometric sensors usually measure the potential difference between a working electrode and a reference electrode, the working electrode being arranged in a buffer solution which is separated from the medium to be examined by a glass membrane.
- the reference electrode is arranged in a reference electrolyte, in the case of a pH sensor, for example a 3.5 molar KCL solution.
- the reference electrolyte In order to ensure a constant quality of the measurement, the reference electrolyte must be replaced at the appropriate time.
- pH or redox sensors usually have a refill opening on their outer surface. Refilling the reference electrolyte proves to be cumbersome, inasmuch as operating personnel have to visit each sensor individually in order to fill through the refill opening.
- the present invention is therefore based on the object of providing a redox sensor or its components which requires less effort to refill the reference electrolyte.
- the object is achieved according to the invention by the plug head in accordance with independent patent claim 1 and in accordance with the sensor arrangement in accordance with independent patent claim 8.
- the sensor plug head according to the invention for connection to a sensor with an output for outputting a measurement signal, and with a liquid container which can be filled with a reference liquid or a calibration liquid, comprises at least one input for receiving the measurement signal, the sensor plug head also having a supply connection for connection to the Contains liquid containers.
- the supply connection according to the invention serves to supply the liquid container with the electrolyte.
- the sensor plug head according to the invention for connection to a potentiometric sensor for outputting a potential-dependent signal
- the potentiometric sensor having a reference container which can be filled with an electrolyte, at least one input for receiving the potential-dependent signal and a supply connection for connection the reference container.
- the supply connection according to the invention serves to supply the reference container with the electrolyte.
- the supply connection preferably comprises a first connection element and the reference container comprises a second connection element, the first connection element being complementary to the second connection element, i.e. this creates a flow connection between the supply connection and the reference container, via which the reference container can be supplied with the electrolyte.
- the supply connection or the first connection element preferably comprises an electrolyte line and the reference container or the second connection element comprises an opening, the electrolyte line being connectable to the opening in order to supply the reference container with electrolyte.
- the input for receiving a potential-dependent signal can, on the one hand, have galvanic contacts for tapping the working potential and the reference potential.
- embodiments are currently preferred in which there is galvanic isolation between the output of the pH sensor and the input of the plug head.
- the sensor plug head and the pH sensor preferably each have complementary inductive interfaces via which the data exchange between the sensor plug head and the pH sensor and the energy supply of the pH sensor take place. Details of the design of inductive interfaces are disclosed, for example, in European Patent Application No. 011124304 by the same applicant.
- the advantage of a non-galvanic signal and energy transmission is, among other things, that all surfaces of the plug head and the complementary cable connection body of the pH sensor can have a corrosion-resistant material.
- the electrolyte line is routed in close proximity to the inductive couplers. This is harmless insofar as the plug head and the cable connection body only have corrosion-resistant surfaces which are insensitive to the reference electrolyte.
- the electrolyte line can be routed in the immediate vicinity of the electrical contacts, but this requires greater care when fitting and removing a plug head in order to avoid contamination of the contacts with the electrolyte.
- barriers can be provided on the plug head or the cable connection between the opening and the Si ⁇ nalaus ⁇ an ⁇ , which ensure that Contamination by the electrolyte remains limited to the area around the opening.
- the invention includes an embodiment in which the plug head has a bayonet lock by means of which it can be attached to the sensor.
- the electrolyte line or the supply connection is guided coaxially with the axis of rotation of the bayonet catch.
- the supply connection or the electrolyte line is guided in the edge region of the plug head.
- the electrolyte line is provided with a flexible connection end which can be connected to a refill opening on the outer surface of a conventional pH electrode.
- the supply connection or the electrolyte line can be connected to a reservoir and, if appropriate, suitable dosing means in order to enable the reference container to be filled over a distance.
- the filling can preferably take place automatically, both periodic and condition-dependent filling being possible.
- the electrolyte line can also be designed as a double line, one wire of the electrolyte line being used to fill the reference container and a second wire to equalize the pressure or to empty the reference container.
- the emptying of the reference container enables a complete exchange of the electrolyte, for which purpose the reference container can be blown out, for example, by introducing a gas into the reference container through the first wire of the electrolyte line.
- the exchange of the electrolyte is all the more complete the further the second wire of the electrolyte line extends down into the reference container.
- either the second wire itself can be made sufficiently long, or it can be connected to the upper opening of a capillary tube, which is arranged in the reference container and extends to the lower end.
- the electrolyte line should preferably consist of a corrosion-resistant material, or at least have a corrosion-resistant coating on the surfaces which come into contact with the electrolyte.
- a corrosion-resistant material or at least have a corrosion-resistant coating on the surfaces which come into contact with the electrolyte.
- polymeric materials and glass come into consideration as materials, these materials being combinable.
- the supply line which is provided for supplying the reference container with electrolytes can either be routed separately from the lines for data exchange or for energy supply to the sensor, or it can be integrated with the latter in a jointly bundled line.
- the integrated wiring harness offers the advantage that the effort required to lay the lines required for a sensor is considerably reduced.
- 1 shows a longitudinal section through a first exemplary embodiment of a plug head according to the invention and a pH electrode according to the invention with galvanic contacts and an opening on the end face side of the reference container;
- 2 shows a longitudinal section through a second exemplary embodiment of a plug head according to the invention in a pH electrode with a container opening on the lateral surface of the electrode;
- FIG 3 shows a detailed view of a longitudinal section through a further exemplary embodiment of a plug head according to the invention and a pH electrode according to the invention with inductive signal transmission between the plug head and the pH electrode.
- a pH electrode 1 usually has two coaxial glass tubes, namely the outer jacket 2 and the inner jacket 3, the outer jacket 2 tapering at its lower end and being tightly connected to the inner jacket 3, so that an outer jacket between the outer jacket and the inner jacket Container for an electrolyte 12 is formed.
- a mostly spherical glass membrane with a wall thickness of less than one to a few micrometers is arranged.
- the inner container, which is delimited by the inner jacket 3 and the glass membrane 4, is filled with a buffer solution 11.
- a diaphragm 5 is also arranged in the outer jacket, via which an electrolyte bridge to the medium to be analyzed is produced.
- the working electrode 6 is arranged, which extends from the interior of the space surrounded by the membrane 4 to the cable connection body 13; 23, 26 extends.
- a reference electrode is arranged in the outer container or reference container and extends from a lower section of the reference container, for example from the height of the diaphragm 5, to the cable connection body 13; 23; 26 extends.
- a plug head 17; 24; 27 can be connected, which on the one hand has an input for reading out the potentials of the working electrode and the reference electrode or a corresponding signal, and which, according to the invention, additionally has a Electrolyte line has to supply the reference container with an electrolyte through a suitable opening.
- the cable connecting body 13 has an essentially section-wise cylindrical structure and is made of a polymeric material.
- a reference connector 14 and a working connector 15 are arranged, which are conductively connected to the reference electrode 7 and the working electrode 6, respectively.
- a bore 16 extends through the end face of the cable connection body 13 and serves as a refill opening for the electrolyte and is aligned with the outer container between the inner jacket 3 and the outer jacket 2.
- the plug head 17 has a structure which is complementary to the cable connection body 13, ie it comprises a reference line 18 and a working opening 19, the connections of which with the reference connection 14 and the work connection 15 come into galvanic contact when the plug head 17 is plugged onto the cable connection body 13 is.
- the plug head 17 has an electrolyte line 20 which is flush with the refill opening 16 and extends through this into the reference container when the plug head 17 is plugged onto the cable connection body 13.
- the electrolyte line (as shown in FIG. 1) can have sealing elements on its outer surface, which come into engagement with complementary recesses in the refill opening 16 and thus seal the opening 16.
- a venting capillary 8 is provided in the embodiment shown in FIG. 1, which enables pressure equalization between the electrolyte chamber and the environment.
- a two-wire electrolyte line 20 can also be provided, the first wire being used for filling the reference container and the second wire for pressure equalization or for emptying the reference container, as previously discussed.
- sealant can be used between the Electrolyte line 20 and the refill opening 16 are dispensed with and the diameter of the electrolyte line 20 can be matched to the diameter of the refill opening 16 in such a way that a gap remains between the electrolyte line and the refill opening through which the pressure equalization can take place.
- Another aspect of the invention relates to the corrosion protection of the electrical connections.
- the electrolyte supply now takes place in the immediate vicinity of the metallic contacts, there is an increased risk of corrosion since the contacts are exposed to a certain risk of contamination when the plug head 17 is placed on and when it is removed.
- a barrier 9 is also provided, which is arranged on the end face of the cable connection body 13 between the refill opening 16 and the cutouts for the connections 14 and 15 in order to reduce the likelihood of contamination.
- the exemplary embodiment shown in FIG. 2 differs from the example from FIG. 1 apart from the already discussed design of the Connections in that the electrolyte line 25 of the plug head 24 is not aligned with the end face of the complementary cable connection body 23, but is guided in the axial direction radially outwards past the end face of the cable connection body 23.
- the sensor-side end of the electrolyte line 25 is preferably flexible and elastic, so that it can be connected to the refill opening 10 in the outer surface of the outer jacket 2.
- Measures for pressure equalization between the reference containers and the environment are preferably provided, as have been discussed in connection with the exemplary embodiment from FIG. 1 and do not require any further discussion here.
- FIG. 2 has the advantage that an appropriately designed plug head 24 with pH electrodes according to the prior art can be used in order to enable its maintenance over larger distances.
- FIG. 3 shows an exemplary embodiment in which any galvanic contacts at the interface between the cable connection body 26 and the plug head 27 have been dispensed with.
- the pH electrode in its cable connection body 26 has a first transducer 28, to the sensor-side input of which the working electrode 6 and the reference electrode 7 are connected.
- the input or output of the first converter 28 on the plug head side is connected to an induction coil 30 in the induction plug 29.
- the induction plug 29 engages in a complementary induction socket 32 in the plug head 27 when the plug head is plugged onto the cable connection body 26.
- the induction socket 32 is surrounded by an induction coil 33, which is embedded in the plug head 27 and connected to the coil-side output of a second converter 31, which is connected, for example, via a two-wire line 34, 35 (4 ... 20 milliamperes).
- the energy supply of the first converter 28 of the pH electrode takes place via an alternating current or AC signal, which is generated by the converter 31 in the plug head 27 and is coupled out via the induction coil 33.
- To transfer the pH-dependent Measurement signal is a load modulation of the AC signal by the converter 28.
- the converter 28 contains a memory element on which, for example, calibration data of the pH electrode or the filling data for the reference container are stored. The memory is also written and read out via modulation or load modulation of the AC signal, the data being exchanged between the plug head 27 and a higher-level station, for example by means of the Hart protocol or one of the other common standards in laboratory technology or process automation technology.
- the exemplary embodiment shown in FIG. 3 is certainly the most complex, but the inductive coupling or decoupling of data completely eliminates any corrosion problems with the associated device failure and the inaccuracy of the measurement data.
- the plug heads according to the invention are not only suitable for conventional potentiometric sensors but also for more modern potentiometric sensors based on ion-sensitive field effect transistors, so-called ISFETS or ChemFETs.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/537,541 US7196524B2 (en) | 2002-12-03 | 2003-11-26 | Sensor plug-in head, particularly for a potentiometric sensor and potentiometric sensor comprising a sensor plug-in head |
| EP03795845A EP1567854A2 (de) | 2002-12-03 | 2003-11-26 | Sensorsteckkopf insbesondere für einen potentiometrischen sensor und potentiometrischer sensor mit sensorsteckkopf |
| AU2003298142A AU2003298142A1 (en) | 2002-12-03 | 2003-11-26 | Sensor plug-in head, particularly for a potentiometric sensor and potentiometric sensor comprising a sensor plug-in head |
| CA002508530A CA2508530A1 (en) | 2002-12-03 | 2003-11-26 | Sensor plug head especially for a potentiometric sensor, and potentiometric sensor with sensor plug head |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10256649.6 | 2002-12-03 | ||
| DE10256649A DE10256649A1 (de) | 2002-12-03 | 2002-12-03 | Sensorsteckkopf insbesondere für einen potentiometrischen Sensor und potentiometrischer Sensor mit Sensorsteckkopf |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2004051246A2 true WO2004051246A2 (de) | 2004-06-17 |
| WO2004051246A3 WO2004051246A3 (de) | 2004-08-19 |
Family
ID=32335961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2003/013274 Ceased WO2004051246A2 (de) | 2002-12-03 | 2003-11-26 | Sensorsteckkopf insbesondere für einen potentiometrischen sensor und potentiometrischer sensor mit sensorsteckkopf |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7196524B2 (de) |
| EP (1) | EP1567854A2 (de) |
| CN (1) | CN100520388C (de) |
| AU (1) | AU2003298142A1 (de) |
| CA (1) | CA2508530A1 (de) |
| DE (1) | DE10256649A1 (de) |
| WO (1) | WO2004051246A2 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8978438B2 (en) | 2010-12-14 | 2015-03-17 | Endress + Hauser Conducta Gesellschaft für Mess-und Regeltechnik mbH + Co. KG | Method for start-up of a measuring device |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004058863A1 (de) * | 2004-12-06 | 2006-06-08 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH | Adapter zur Elektrolytzufuhr für einen potentiometrischen Sensor |
| DE102006055221A1 (de) * | 2006-11-21 | 2008-05-29 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Elektrode und Einstabmesskette zur Bestimmung elektrochemischer Potentiale |
| DE102007039528A1 (de) * | 2007-08-21 | 2009-02-26 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Feldgerät für die Prozessautomatisierung |
| DE102007049523A1 (de) * | 2007-10-15 | 2009-04-16 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | System für die Prozessautomatisierung mit einer Vielzahl von intelligenten Sensoren und ein Verfahren zur Kalibrierung der Sensoren |
| DE102008055084A1 (de) * | 2008-12-22 | 2010-06-24 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Ionenselektive Elektrode |
| US8664938B2 (en) | 2010-05-05 | 2014-03-04 | Ysi Incorporated | Replaceable probe head |
| US9170132B2 (en) | 2010-05-05 | 2015-10-27 | Ysi Incorporated | Replaceable probe head having an operational amplifier |
| DE102011083675A1 (de) * | 2011-09-29 | 2013-04-04 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Sensor zur Bestimmung und/oder Überwachung von zumindest einer gelösten Substanz in einem Medium |
| GB2519957A (en) * | 2013-11-01 | 2015-05-13 | Stratec Biomedical Ag | Hybrid connection device |
| DE102013113258A1 (de) * | 2013-11-29 | 2015-06-03 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | Sensor und Messanordnung |
| JP7056331B2 (ja) * | 2018-04-04 | 2022-04-19 | 横河電機株式会社 | 液質検出器及び液質分析システム |
| JP7339493B2 (ja) * | 2019-03-28 | 2023-09-06 | 東亜ディーケーケー株式会社 | 測定プローブ |
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| DE7208139U (de) * | 1972-03-03 | 1972-05-18 | Jenaer Glaswerk Schott & Gen | Elektroden-Steckkopf |
| US4329649A (en) * | 1979-12-12 | 1982-05-11 | Gibbs & Hill, Inc. | Ion sensor probe |
| JPS57136158A (en) * | 1981-02-17 | 1982-08-23 | Sumitomo Electric Ind Ltd | Ph electrode |
| JPS5861457A (ja) * | 1981-10-07 | 1983-04-12 | Yokogawa Hokushin Electric Corp | pH計センサ |
| DE3324297A1 (de) * | 1983-07-06 | 1985-01-17 | Conducta Gesellschaft für Meß- und Regeltechnik mbH & Co, 7016 Gerlingen | Multikombinationselektrode mit zugeordnetem mehrfach-steckkopf |
| JPS60231156A (ja) * | 1984-04-30 | 1985-11-16 | Kuraray Co Ltd | 液絡式の比較電極 |
| DE3723798A1 (de) * | 1987-07-18 | 1989-01-26 | Viktor Dulger | Messgeraet fuer chlor aufweisende substanzen |
| DE8814743U1 (de) * | 1988-11-26 | 1989-03-09 | Conducta Gesellschaft für Meß- und Regeltechnik mbH & Co, 7016 Gerlingen | Meßelektrode in der analytischen Chemie |
| JPH082609Y2 (ja) * | 1990-04-09 | 1996-01-29 | 株式会社堀場製作所 | イオン濃度測定シート電極用コネクタ |
| DE4014497C1 (en) * | 1990-05-07 | 1991-03-07 | Franz Binder Gmbh & Co Elektrische Bauelemente Kg, 7107 Neckarsulm, De | Plug connector for pH probe - has metallic tubular pieces which are earthed to provide good shielding |
| DE4233288C2 (de) * | 1992-10-02 | 1995-06-08 | Schott Geraete | Elektrisches Multikontakt-Steckverbindersystem |
| DE19526821A1 (de) * | 1995-07-12 | 1997-01-16 | Bosch Gmbh Robert | Meßeinrichtung |
| DE19541218C2 (de) * | 1995-11-04 | 2003-09-11 | Bosch Gmbh Robert | Anschluß und/oder Kupplungselement eines Meßfühlers |
| DE29519677U1 (de) * | 1995-12-12 | 1996-01-25 | Endress + Hauser Conducta Gesellschaft für Meß- und Regeltechnik mbH + Co., 70839 Gerlingen | Einstabmeßkette für elektrochemische Größen |
| DE19611572A1 (de) * | 1996-03-23 | 1997-09-25 | Bosch Gmbh Robert | Anschlußleitung für einen Meßfühler |
| AU4452997A (en) * | 1996-07-31 | 1998-02-25 | Paul-Gerhard Fenzlein | Housing for interchangeable measurement cartridges or cells used for setting biochemical measurement parameters in computer-controlled analysis systems, and related buit-in devices inside measurement cartridges or cells |
| DE29705433U1 (de) * | 1997-03-26 | 1997-05-28 | Schott-Geräte GmbH, 65719 Hofheim | Einstabmeßkette für elektrochemische Messungen |
| CN2336358Y (zh) * | 1998-04-13 | 1999-09-01 | 中国科学院南京土壤研究所 | 离子选择性电极 |
| DE19833863A1 (de) * | 1998-07-28 | 2000-02-03 | Bosch Gmbh Robert | Kabelanschluß für Meßfühler |
| NL1012421C2 (nl) * | 1999-06-23 | 2000-12-28 | Yokogawa Electric Corp | Sensorbehuizing. |
| DE19942760C1 (de) * | 1999-09-08 | 2001-02-01 | Inst Mikrotechnik Mainz Gmbh | Kapillarsteckverbinder |
| DE10055090A1 (de) * | 2000-11-07 | 2002-05-08 | Conducta Endress & Hauser | Steckverbinder zum Anschluss einer Übertragungsleitung an mindestens einen Sensor |
| US6551478B1 (en) * | 2001-04-09 | 2003-04-22 | The United States Of America As Represented By The Department Of Energy | Flexible high-temperature pH probe |
-
2002
- 2002-12-03 DE DE10256649A patent/DE10256649A1/de not_active Withdrawn
-
2003
- 2003-11-26 EP EP03795845A patent/EP1567854A2/de not_active Withdrawn
- 2003-11-26 CN CNB200380104941XA patent/CN100520388C/zh not_active Expired - Fee Related
- 2003-11-26 AU AU2003298142A patent/AU2003298142A1/en not_active Abandoned
- 2003-11-26 CA CA002508530A patent/CA2508530A1/en not_active Abandoned
- 2003-11-26 US US10/537,541 patent/US7196524B2/en not_active Expired - Fee Related
- 2003-11-26 WO PCT/EP2003/013274 patent/WO2004051246A2/de not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8978438B2 (en) | 2010-12-14 | 2015-03-17 | Endress + Hauser Conducta Gesellschaft für Mess-und Regeltechnik mbH + Co. KG | Method for start-up of a measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10256649A1 (de) | 2004-06-24 |
| WO2004051246A3 (de) | 2004-08-19 |
| AU2003298142A8 (en) | 2004-06-23 |
| CN100520388C (zh) | 2009-07-29 |
| EP1567854A2 (de) | 2005-08-31 |
| US7196524B2 (en) | 2007-03-27 |
| CA2508530A1 (en) | 2004-06-17 |
| US20060125484A1 (en) | 2006-06-15 |
| CN1720449A (zh) | 2006-01-11 |
| AU2003298142A1 (en) | 2004-06-23 |
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