CN102257385A - Gas sensor assembly containing a gasfet sensor and a filter element for degrading ozone - Google Patents

Gas sensor assembly containing a gasfet sensor and a filter element for degrading ozone Download PDF

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Publication number
CN102257385A
CN102257385A CN2009801510386A CN200980151038A CN102257385A CN 102257385 A CN102257385 A CN 102257385A CN 2009801510386 A CN2009801510386 A CN 2009801510386A CN 200980151038 A CN200980151038 A CN 200980151038A CN 102257385 A CN102257385 A CN 102257385A
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China
Prior art keywords
gas detector
detector structure
filtering element
gas
shell
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CN2009801510386A
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CN102257385B (en
Inventor
M.弗莱舍尔
U.赫费尔
R.波勒
O.冯西卡尔德
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Siemens Schweiz AG
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Siemens AG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
    • G08B21/16—Combustible gas alarms
    • 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
    • G01N27/414—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
    • G01N27/4141—Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS specially adapted for gases
    • 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
    • G01N33/0013—Sample conditioning by a chemical reaction
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Business, Economics & Management (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Emergency Management (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Toxicology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

The invention relates to a gas sensor assembly, particularly for use in a fire alarm, which comprises at least one gas sensor module. A filter element is provided in the housing of the gas sensor assembly or in the area of the gas sensor module, wherein said filter element is designed for the degradation of ozone that comes near said filter element.

Description

Comprise GASFET detector and the gas detector structure that is used for the filtering element of ozone decomposition
Technical field
For automatic detection, use parameter such as light scattering, temperature rise, or also using gases detector recently.Here detector is used to survey the gas of following fire.In order to improve detection reliability, also use so-called many standards alarm, it analyzes a plurality of fire parameters simultaneously.In this case, this structure must be simple as far as possible and cheap so that can survive.
Background technology
The gas detector that uses when detection is very responsive for a series of gases of fire of following.Thereby allow its most probable early and anti-interferencely to carry out detection.Utilize gas detector can produce before the real fire in case of necessity-during for example in the little combustion of cable-just produce warning, in some cases even can sort out cause of fire and fire type.
But the shortcoming of high sensitive gas detector is, they are to being not that the gas that originates from fire is reacted yet.This gas is ozone (O 3).Ozone for example produces by laser printer and the light source that contains UV.But much better than ozone source is the fair weather situation in summer.At this moment outside the building because of photocatalysis treatment produces ozone, and ozone normally decomposes fully indoor.If now in the room that is provided with the fire-alarm that possesses corresponding gas detector, open the window, then carry out strong air exchange.Air exchange causes the strong and rising fast of ozone concentration.This rising can produce a kind of signal that is similar to fire signal in gas detector, also promptly pretend fire.
Summary of the invention
Task of the present invention provides a kind of gas detector structure that addresses the above problem.Described gas detector structure should be especially insensitive with respect to ozone.
The gas detector structure of the feature of this task by having claim 1 solves.Dependent claims relates to favourable improvement of the present invention and expansion.
Gas detector structure of the present invention has at least one the gas detector module that is used to survey one or more object gas.Here, described gas detector module is placed in the enclosure, and wherein said shell is provided with at least one inlet channel.Described inlet channel allows gas to enter into the inside of shell from space outerpace, and this shell is preferably airtight in other respects.In addition, described gas detector structure also has at least one filtering element.This filtering element is configured to impel the ozone that contacts with described filtering element to decompose.
At this, described filtering element can be constructed to the body that separates with described shell, for example with the form of metal gate.Described filtering element closely can also be connected with described shell in addition, for example as the coating of described shell.
Can also be that described shell and described filtering element are same objects.In other words, described shell satisfies the function of described filtering element simultaneously, and vice versa.
Advantageously facilitated by structure of the present invention: the ozone of interference only arrives with trace as far as possible or even no longer arrives gas detector in the gas detector module.Thereby reduce significantly immediately or avoid the disturbing effect of ozone fully the gas detector module.This is very favorable, because ozone is similar to the gas of following fire of gas to the effect of semiconductor gas bulk detector of representative gases detector-for example or GasFET-, disturbs the very difficulty that seems to such an extent as to handle to eliminate by appropriate signal.Here utilized: other follows the gas of fire opposite with great majority, and ozone is very unsettled, and decomposes very fast on most of surfaces.Utilized in addition when decomposing and only produced oxygen.Because about 20% of air is an oxygen, ozone only occurs with the concentration of the highest hundreds of ppb, and the therefore additional oxygen that produces is inappreciable fully.Finally, because ozone is micro-, whether also consuming the gas of following fire of similar amt when ozone decomposes, also is inappreciable.Also promptly, these follow the gas of fire to occur with tens ppm or higher much bigger concentration.
Preferably, described gas detector structure is configured and makes that the inside of described shell is stationary stream.This means that the air flow that is present in housing exterior continues no longer in the enclosure, or only continue in the enclosure with the degree of denier.Specifically, portion in fact mainly is static air in the enclosure.The advantage of this specific character is that ozone can not be sent to the gas detector module apace and not separate in filtering element punishment in advance simultaneously by the air-flow that may exist.So the shell of stationary stream has been guaranteed the functional of detection and filtering element.
For the filtering element shell of packing into, multiple possibility is arranged.First kind of possibility is, filtering element is integrated in the shell, makes that the gas that enters the gas detector module from the outside in principle must be through filtering element.In other words, in this case, gas must flow and pass filtering element.This for example can realize in the following way: the inlet channel of shell, also promptly the opening in shell is filled by filtering element.Filtering element for example may be implemented as sintered body, metal foam (sintering metal) or the grid structure of porous here.Another kind of possibility is that filtering element is placed directly on before the gas detector module, and not capping enters the passage of shell thus, but only the inlet channel of gas detector module or each gas detector is led in capping.Two kinds of possibilities can make up.
Second kind of replacement scheme is that filtering element is placed in the shell, makes the gas that enters shell to flow through along filtering element.Can lay filtering element at least in part for example for the enclosure of gas detector structure for this reason.
A kind of favourable expansion of the present invention and improvement be, prolongs the length that enters of the gas that enters shell.Reach thus: enter the ozone of the gas of shell-especially-the have possibility of decomposition through further highway section.For example can baffle plate be set in the inlet channel zone that enters shell, these baffle plates prolong the air inlet path for this reason.
Filtering element self is preferably by forming such as aluminium, stainless steel, silver or brass.Other material for example is the oxide of transition metal, for example Mn oxide, ferriferous oxide or nickel oxide.Also can the non-reacted oxide of non-reacted carrier material-for example resemble aluminum oxide-on oxide on the coated catalysts meaning.The catalyzer that this non-reacted carrier material also can carry other form is used for ozone decomposition, and for example platinum or palladium disperse thing.Other carrier material is gallium oxide and polymkeric substance.Described material advantageously impels the ozone to being in contact with it to decompose.Here it is to be noted, at the employed stabilization of polymer of the shell that is generally fire-alarm-for example polycarbonate or ABS(acrylonitrile-styrene-butadiene copolymer)-to locate, ozone does not decompose or only decomposes on a small quantity.
Description of drawings
Now elaborate the preferred but embodiment of restriction never of the present invention by means of accompanying drawing.Here, feature is illustrated briefly, and corresponding feature indicates with identical Reference numeral.Here accompanying drawing is shown specifically:
Fig. 1 is first gas detector structure with grid shape filtering element,
Fig. 2 is second gas detector structure that is provided with filtering element in shell,
Fig. 3 is the 3rd gas detector structure with the baffle plate that is used to prolong the air inlet path,
Fig. 4 is for to have the 4th gas detector structure of filtering element in the gas detector module region.
Embodiment
Fig. 1 illustrates first gas detector structure 10.This gas detector structure is made up of the gas detector module 13 that comprises a plurality of GasFET.Described GasFET is configured to survey a series of gas of following fire.Described gas detector module 13 is surrounded by shell 11.Shell 11 has two air inlet openings.Two air inlet openings are sealed with fine mesh metal gate 12 made of aluminum.
This field effect transistor gas detector structure 10 can for example show as fire-alarm.In order to survey for example NO 2The gas of following fire, GasFET has a kind of sensitive layer.This sensitive layer in described example to NO 2Be responsive.Be used to survey NO 2A kind of fit closely material group of sensitive layer be phthalocyanine (Phthalocyanine).
Especially advantageously GasFET is configured to so-called suspension grid GasFET.Here, between the conducting channel of sensitive layer and FET, air gap is set.This FET can be constructed to compound (HSGFET).Here, have the structure of sensitive layer and all the other FET and separate and made, two parts are assembled afterwards.Also can infer in a workpiece and make.Sensitive layer also can be set on the conducting channel under the situation of air gap not having in case of necessity, so that simplify the structure of GasFET.
Metal gate 12 is responsible for the air flow that the blocking-up outside exists on the one hand.They allow gas to enter into shell 11 from the outside but then.But the fine mesh by metal gate 12 impels the ozone that is present in the extraneous air further to be decomposed here.
Second gas detector structure 20 of Fig. 2 is similar to first gas detector structure 10 and is configured.But the difference with first gas detector structure 10 is here, and air inlet openings 21 is not established metal gate 12.Substituting, the part of the inwall of shell 11 are coated with the coating 22 of division ozone.This situation has the coating of nickel oxide as division ozone.
The 3rd gas detector structure 30 of Fig. 3 is similar to second gas detector structure 20 of Fig. 2 to a great extent.But be provided with additional baffle plate 31 in the 3rd gas detector structure 30, described baffle plate is constructed the zone of air inlet openings 21, makes the air inlet path that leads to the inside of shell 11 from the outside of shell 11 obviously extend.So the gas that enters from the outside must be covered sinuous path with the inside that reaches shell 11 and the zone of gas detector module 13.In this case, the ozone that exists sometimes has time enough decomposing on the baffle plate or on the coating 22 of division ozone.
The another kind of possibility of described structure is, also covers the coating 22 of division ozone on baffle plate 31.Improve the ozone decomposing efficiency thus.
Fig. 4 illustrates another kind of modification, i.e. the 4th gas detector structure 40.In the 4th gas detector structure 40, above the air inlet openings of gas detector module 13, a kind of porous sintered element 41 is arranged.Promptly not to resemble the inlet channel that leads to shell 11 to be improved first to the 3rd gas detector structure 10,20,30 in this case yet, but the inlet channel of the gas detector that leads to the script in the gas detector module 13 is improved.

Claims (16)

1. a gas detector structure (10,20,30,40) has:
-be used to survey at least one GasFET gas detector module (13) of one or more object gas,
-Nei is equipped with the shell (11) of described gas detector module (13), and wherein said shell is provided with at least one inlet channel (21),
-at least one filtering element (12,22), it is configured to cause the ozone with described filtering element (12,22) contact to decompose.
2. gas detector structure as claimed in claim 1 (10,20,30,40), wherein said GasFET gas detector module (13) have the layer to gas sensitization, and this layer to gas sensitization has the phthalocyanine material.
3. gas detector structure as claimed in claim 1 or 2 (10,20,30,40), wherein said GasFET gas detector module (13) is constructed to compound GasFET.
4. as one of above-mentioned claim described gas detector structure (10,20,30,40), it is configured and makes that the inside of described shell (11) is stationary stream.
5. as one of above-mentioned claim described gas detector structure (10,20,30,40), it is configured and makes the gas that enters described shell (11) to flow through in described filtering element (22) in front.
6. gas detector structure as claimed in claim 5 (10,20,30,40), it is configured and makes described filtering element (22) be set at least a portion of inwall of described shell (11).
7. as one of above-mentioned claim described gas detector structure (10,20,30,40), it is configured and makes the gas that enters described shell (11) must pass described filtering element (12).
8. gas detector structure as claimed in claim 7 (10,20,30,40), it is configured the inlet channel that makes described filtering element (12) constitute described shell (11).
9. as claim 7 or 8 described gas detector structure (10,20,30,40), the sintered body that wherein said filtering element (41) has at least one porous.
10. as the described gas detector structure of one of claim 7-9 (10,20,30,40), wherein said filtering element (12) has the grid structure.
11. as the described gas detector structure of one of claim 7-10 (10,20,30,40), its be configured make described filtering element (41) be set at described gas detector module near.
12. as the described gas detector structure of one of claim 4-11 (10,20,30,40), it is provided with baffle element (31) and is used for stationary stream, described baffle element has prolonged the path of the gas that enters enclosure.
13. gas detector structure as claimed in claim 12 (10,20,30,40), wherein said filtering element is set at least a portion of described baffle element.
14. as one of above-mentioned claim described gas detector structure (10,20,30,40), wherein said filtering element (12,41) has metal.
15. as one of above-mentioned claim described gas detector structure (10,20,30,40), wherein said filtering element has carrier material and filtering material, wherein said filtering material has one or more in the following material:
The oxide of-transition metal,
-platinum,
-palladium.
16. a fire-alarm has as the described gas detector structure of one of above-mentioned claim (10,20,30,40).
CN200980151038.6A 2008-12-19 2009-12-10 Gas sensor assembly containing GASFET sensor and filter element for degrading ozone Expired - Fee Related CN102257385B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102008063867 2008-12-19
DE102008063867.6 2008-12-19
DE102009034385 2009-07-23
DE102009034385.7 2009-07-23
PCT/EP2009/066816 WO2010069853A1 (en) 2008-12-19 2009-12-10 Gas sensor assembly containing a gasfet sensor and a filter element for degrading ozone

Publications (2)

Publication Number Publication Date
CN102257385A true CN102257385A (en) 2011-11-23
CN102257385B CN102257385B (en) 2013-12-25

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CN200980151038.6A Expired - Fee Related CN102257385B (en) 2008-12-19 2009-12-10 Gas sensor assembly containing GASFET sensor and filter element for degrading ozone

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CN (1) CN102257385B (en)
WO (1) WO2010069853A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT1103937E (en) * 1999-11-19 2005-09-30 Siemens Building Tech Ag FIRE DETECTOR
DE10107169B4 (en) * 2001-02-15 2005-06-30 Siemens Ag Method for monitoring the function of ozone in motor vehicles
EP1371982B1 (en) * 2002-06-11 2004-11-24 Dräger Safety AG & Co KGaA Device and method for measuring alcohol on the breath
DE102005033226A1 (en) * 2005-07-15 2007-01-25 Siemens Ag Method for the simultaneous detection of several different air loads
US20080030352A1 (en) * 2006-02-27 2008-02-07 Thorn Security Limited Methods and systems for gas detection
US8349260B2 (en) * 2006-05-19 2013-01-08 Microsensor Systems, Inc. System and method for limiting sensor exposure to ozone

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Publication number Publication date
EP2368109A1 (en) 2011-09-28
CN102257385B (en) 2013-12-25
WO2010069853A1 (en) 2010-06-24

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