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WO2007065620A1 - Dispositif de protection pour un capteur de mesure de paramètres d’un fluide - Google Patents

Dispositif de protection pour un capteur de mesure de paramètres d’un fluide Download PDF

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Publication number
WO2007065620A1
WO2007065620A1 PCT/EP2006/011613 EP2006011613W WO2007065620A1 WO 2007065620 A1 WO2007065620 A1 WO 2007065620A1 EP 2006011613 W EP2006011613 W EP 2006011613W WO 2007065620 A1 WO2007065620 A1 WO 2007065620A1
Authority
WO
WIPO (PCT)
Prior art keywords
protection device
active substance
protective body
sensor
fluid
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
Application number
PCT/EP2006/011613
Other languages
German (de)
English (en)
Inventor
Markus Langenbacher
Axel Broedel
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.)
Testo SE and Co KGaA
Original Assignee
Testo SE and Co KGaA
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 Testo SE and Co KGaA filed Critical Testo SE and Co KGaA
Publication of WO2007065620A1 publication Critical patent/WO2007065620A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning
    • G01N33/0014—Sample conditioning by eliminating a gas
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity

Definitions

  • Protection device for a sensor for measuring parameters of a fluid
  • the invention relates to a protective device for a sensor for measuring parameters of a fluid with a protective body which is permeable to the fluid to be measured, through which the fluid to be measured reaches the sensor.
  • the invention is in the field of sensor technology, more precisely in the field of protective devices for sensors which are easily damaged by environmental influences or whose measured values are easily falsified by such influences.
  • sensors which are used to measure material properties and for this purpose have to be brought into contact with different substances.
  • the sensors for measuring the properties of fluids which naturally have to be brought into contact with the corresponding fluids, are particularly known.
  • Such fluids often contain additives that falsify the measurements or damage or even destroy the sensors.
  • the fluid is a gas, it can contain moisture components that can be harmful to a sensor and play no role in the actual measurement.
  • the measurement task can also be to measure a moisture content in a gas.
  • Other substances, such as for example, can also be used here
  • protective caps are known that are permeable and have a chemical reservoir, the reservoir being a re- can contain a reducing agent or a catalyst. With the help of the chemical in the reservoir, substances that can damage the sensor are to be bound or rendered harmless.
  • the object of the present invention is to keep away from the sensor, in a protective device of the type mentioned, those substances which can interfere with the measurement or damage the sensor, not to disrupt the actual measurement process, and to do so with as little financial and structural effort as possible realize.
  • the protective body has finely divided through openings, on the surfaces of which an active substance is arranged, which at least partially makes disruptive admixtures of the medium to be measured harmless. It is due to the fine distribution of the active ingredient in the
  • Openings of the protective body ensure that the medium to be measured is offered a very large interaction area, to which the harmful additives can be bound or converted.
  • the construction according to the invention ensures that on the one hand the medium has free access to the sensor, but on the other hand intensive filtering of the medium takes place in the finely divided openings.
  • the protective body can advantageously contain a sintered material.
  • the protective body can be produced simply by pressing with or without heating, and through openings in the protective body can be kept open during sintering.
  • the active substance is deposited in these openings so that it comes into contact with the medium when the medium to be measured flows through the protective body.
  • Corresponding sintered materials such as polytetrafluoroethylene, are inexpensive and easy to manufacture and process. A variety of shapes can be produced with it.
  • the protective body can take the form of a protective cap that can be placed on a sensor. However, it can also be provided that the protective body forms only part of a protective cap, for example a cover. The remaining parts of the protective cap can then consist of a solid material without through openings.
  • Another advantageous embodiment of the invention provides that the sintered material is mixed with the active substance. This ensures that the through openings are also essentially covered with the active substance.
  • the protective body can also be produced by sintering a mixture of a mixture consisting of the sintered material and the active substance.
  • the sintered material is first wetted, covered or otherwise brought into contact with the active substance and then the mixture is mixed in Form pressed or sintered.
  • the active substance is largely and uniformly distributed in the protective body.
  • the protective body would first be produced by sintering without the addition of the active substance, and the active substance would then be added.
  • the active substance can also serve, for example, to impregnate the protective body in order to achieve fine distribution on the sintered material.
  • the protective body can also be produced from a granulate which is produced by comminuting an intermediate material, the intermediate material being formed as a solid body from a mixture of the active substance and a sintered material.
  • the active substance can first be mixed with PTFE and pressed. The pressed body can then be comminuted again and the resulting granulate can then be used to produce the final protective body by sintering again.
  • the active substance can advantageously contain a catalyst which effects the corresponding desired conversion of the harmful substance or substances in the medium to be measured.
  • the active substance contains a reducing or oxidizing agent, an absorbent or a buffer substance.
  • the selection of the substance contained in each case depends on which harmful substances are to be bound or converted.
  • the active ingredient can also contain an indicator. In this case, the presence of certain substances is indicated by the indicator for a user of the sensor, so that before certain harmful substances can be warned that must not reach the sensor or that can be displayed when the active substance in the protective body begins to be used up, so that the protective body must be replaced.
  • manganese dioxide manganese oxide, MnO 2
  • MnO 2 manganese oxide
  • the MnO 2 advantageously represents a mass fraction of 0.01% to 30% of the material from which the protective body is made. It is then a mixture of, for example, PTFE and brown stone with a corresponding mass fraction of brown stone.
  • the mass fraction of manganese dioxide in the material of the protective body is preferably less than 20%. This increases mechanical stability.
  • a mass content of between 1% and 5% of manganese dioxide in the material of the protective body is particularly preferred. In this area, optimal mechanical properties are combined with the best chemical properties to protect a moisture sensor, for example.
  • the invention is based on the in the figures of the
  • FIG. 1 shows a protective body in the form of a protective cap in
  • FIG. 2 shows a protective cap in a longitudinal section and part of a sensor onto which the protective cap can be screwed.
  • Figure 1 shows schematically a cylindrical hollow protective cap 1, which has a rounded edge at its closed end 2 and which can be placed on a moisture sensor, for example a capacitive polymer moisture sensor for protection against aggressive environments.
  • the protective cap 1 consists of a porous material which has been shaped into a shape by sintering polytetrafluoroethylene granules, the granules having been mixed with manganese dioxide (manganese oxide) before pressing.
  • the wall thickness of the protective cap 1, the degree of compression or the packing density of the granulate particles is selected such that a gas to be measured, for example air, can pass through the protective cap to a sufficient extent and reach the sensor, but on the way through the openings the corresponding admixtures, for example in the form of hydrogen peroxide (H 2 O 2 ), come into contact with the manganese dioxide so intensively that a catalytic reduction to water and oxygen practically makes the hydrogen peroxide completely harmless.
  • the manganese oxide represents 3% of the total mass of the protective body and is evenly distributed on the PTFE granulate.
  • catalysts can alternatively be used as active substances, such as, for example, precious metals (for example Pt, Au, Ag) for converting nitrogen oxides and hydrogen peroxide, as well as metal oxides and also enzymes (for example catalase).
  • precious metals for example Pt, Au, Ag
  • metal oxides and also enzymes for example catalase
  • Metal oxides and salts for example KMNO 4 for the reaction of O 3 , CO, Cl 2 can be used as reducing / oxidizing agents.
  • Activated carbon is particularly suitable as an absorbent for binding chlorine, ozone and acids such as hydrochloric acid, sulfuric acid and others. It can also be used as Buffer substances NaOH or organic acids can be used to buffer the corresponding acids and bases.
  • indicators can be introduced into the protective body as active substances, which serve to display the pH value and other chemical variables, for example to indicate sensor impairments, for example in the event of damage or consumption of catalysts, or the expiry of the useful life or the filter functionality to signal.
  • FIG. 2 shows a sensor 3 with a shaft 4, on the thread 5 of which the protective cap can be screwed on.
  • the active substance can be introduced into the pores of the sintered material by mechanical processing (rubbing in, pressing in, soaking), or the granular form of the sintered material mixed with the active substance in order to compress the mixture thereafter. It is also possible to crush the resulting body again after this process and to compress or sinter the resulting granulate again.
  • a sintered material can first be mixed and pressed with a first active substance, then the body pressed in this way can be comminuted and mixed with a further active substance in order to compress the resulting mixture again.
  • a certain mechanical stability which is essentially given by the sintered material, for example the PTFE, cannot be changed. the.
  • the protective body it is desirable for the protective body to retain a certain elasticity and breaking strength.
  • the protective cap there is the need for the protective cap to be screwable onto the sensor in the example shown, so that a load-bearing thread must be provided in the protective cap. Shares that go beyond 30% surcharge of an active ingredient have turned out to be negative. Better results are achieved below 20%, optimal constellations below 5% by mass of the active substance.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Catalysts (AREA)

Abstract

La présente invention concerne un dispositif de protection pour un capteur de mesure de paramètres d’un fluide avec un corps de protection (1) perméable au fluide à mesurer à travers lequel le fluide à mesurer circule jusqu’au capteur (3), le corps de protection (1) comportant de fines ouvertures séparées traversantes, à la surface desquelles une substance active est déposée, qui rend au moins partiellement inoffensives les incorporations parasites du fluide à mesurer.
PCT/EP2006/011613 2005-12-06 2006-12-04 Dispositif de protection pour un capteur de mesure de paramètres d’un fluide Ceased WO2007065620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005058194.3 2005-12-06
DE200510058194 DE102005058194A1 (de) 2005-12-06 2005-12-06 Schutzeinrichtung für einen Sensor zur Messung von Parametern eines Fluids

Publications (1)

Publication Number Publication Date
WO2007065620A1 true WO2007065620A1 (fr) 2007-06-14

Family

ID=37744105

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/011613 Ceased WO2007065620A1 (fr) 2005-12-06 2006-12-04 Dispositif de protection pour un capteur de mesure de paramètres d’un fluide

Country Status (2)

Country Link
DE (1) DE102005058194A1 (fr)
WO (1) WO2007065620A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112097847A (zh) * 2020-09-18 2020-12-18 深圳市嘉荣华科技有限公司 一种带有回转安装结构的脉冲直读智能水表

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001880A1 (fr) * 1979-12-26 1981-07-09 Matsushita Electric Industrial Co Ltd Element de detection d'atmosphere
GB2067294A (en) * 1980-01-12 1981-07-22 Daimler Benz Ag Electrochemical sensor with protective device for determining oxygen content in exhaust
JPS5868655A (ja) * 1981-10-20 1983-04-23 Matsushita Electric Ind Co Ltd 湿度検知素子
JPH01187444A (ja) * 1988-01-21 1989-07-26 Shimadzu Corp カード型アンモニアセンサ及びその測定装置
JPH04145362A (ja) * 1990-10-08 1992-05-19 Shoko Kagaku Kenkyusho:Kk センサー
DE19517144C1 (de) * 1995-05-10 1996-07-04 Draegerwerk Ag Filter für elektrochemische Meßzelle
EP0957357A1 (fr) * 1998-05-11 1999-11-17 Heraeus Electro-Nite International N.V. Boítier pour un capteur de gaz avec un capot protecteur cylindrique, poreux, réalisé par frittage d'une poudre et percé au front

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Publication number Priority date Publication date Assignee Title
JPS5722544A (en) * 1980-07-16 1982-02-05 Matsushita Electric Ind Co Ltd Sensing element
JP3152699B2 (ja) * 1991-10-02 2001-04-03 日本特殊陶業株式会社 限界電流式ガスセンサ
DE4233178A1 (de) * 1992-10-02 1994-04-07 Bosch Gmbh Robert Elektrochemische Sonde und Verfahren zu deren Herstellung
DE19703662B4 (de) * 1996-01-31 2005-08-25 Denso Corp., Kariya Sauerstoffkonzentrations-Meßvorrichtung und Verfahren zu deren Herstellung
GB9903021D0 (en) * 1999-02-10 1999-03-31 Capteur Sensors & Analysers Gas sensors with improved specificity and poison resistance
JP2002071632A (ja) * 2000-06-12 2002-03-12 Denso Corp ガスセンサ素子
US6468407B2 (en) * 2000-12-19 2002-10-22 Delphi Technologies, Inc. NOx reduction sensor coating

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001880A1 (fr) * 1979-12-26 1981-07-09 Matsushita Electric Industrial Co Ltd Element de detection d'atmosphere
US4428909A (en) * 1979-12-26 1984-01-31 Matsushita Electric Industrial Co., Ltd. Environmental condition sensor
GB2067294A (en) * 1980-01-12 1981-07-22 Daimler Benz Ag Electrochemical sensor with protective device for determining oxygen content in exhaust
JPS5868655A (ja) * 1981-10-20 1983-04-23 Matsushita Electric Ind Co Ltd 湿度検知素子
JPH01187444A (ja) * 1988-01-21 1989-07-26 Shimadzu Corp カード型アンモニアセンサ及びその測定装置
JPH04145362A (ja) * 1990-10-08 1992-05-19 Shoko Kagaku Kenkyusho:Kk センサー
DE19517144C1 (de) * 1995-05-10 1996-07-04 Draegerwerk Ag Filter für elektrochemische Meßzelle
EP0957357A1 (fr) * 1998-05-11 1999-11-17 Heraeus Electro-Nite International N.V. Boítier pour un capteur de gaz avec un capot protecteur cylindrique, poreux, réalisé par frittage d'une poudre et percé au front

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 198130, Derwent World Patents Index; AN 1981-55109D, XP002421423 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112097847A (zh) * 2020-09-18 2020-12-18 深圳市嘉荣华科技有限公司 一种带有回转安装结构的脉冲直读智能水表
CN112097847B (zh) * 2020-09-18 2021-05-11 深圳市嘉荣华科技有限公司 一种带有回转安装结构的脉冲直读智能水表

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