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公开(公告)号：US10859523B2
公开(公告)日：2020-12-08
申请号：US16122964
申请日：2018-09-06
IPC分类号： G01N27/18 , G01N25/18 , G01N27/12 , G01N27/407 , G01N33/00
摘要： Disclosed is a gas sensor for detecting hydrogen gas in a measurement gas atmosphere, including: a first installation part defining a first inner space in communication with the measurement gas atmosphere through a solid electrolyte membrane member; a second installation part defining a second inner space in direct communication with the measurement gas atmosphere; first and second sensor elements respectively installed in the first and second inner spaces; and a calculation unit configured to calculate the concentration of the hydrogen gas according to a potential between the first and second sensor elements. The gas sensor further includes a current detecting portion that detects a current flowing through the first and second sensor elements. The calculation unit is configured to, when the current detected by the current detecting portion is larger than or equal to a threshold value, judge that the hydrogen gas is present at high concentration.
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公开(公告)号：US09816975B2
公开(公告)日：2017-11-14
申请号：US15090751
申请日：2016-04-05
CPC分类号： G01N33/0036 , G01N27/123
摘要： A fluid state detection apparatus which can detect a short failure in which a constituent Wheatstone bridge circuit is shorted to a power supply. A combustible gas detection apparatus (1) judges that a short failure has occurred in a constant temperature control circuit (231) (S240) when a top potential V21 is equal to or greater than a first judgment value Vth1 and a difference D1 (=V11−V31) is equal to or greater than a second judgment value Vth2. As a result, apparatus (1) can distinguish “a state in which a bridge circuit (210) is shorted to a DC power supply (40) (where the constant temperature control circuit 231 is in a short failure state)” from “a state in which the resistance of the heat generation resistor (15) deceases due to a combustible gas (hydrogen)” based on the top potential V21 and the difference D1.
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公开(公告)号：US10024813B2
公开(公告)日：2018-07-17
申请号：US14811206
申请日：2015-07-28
IPC分类号： G01N27/12
摘要： A gas detection apparatus (1) which includes a gas detection element (3) including a heat generation resistor (34); an energization control section (7) which switches the energization state of the heat generation resistor to alternately assume one of two resistance values corresponding to one of two set temperatures set in advance; and a casing member (90) which accommodates the gas detection element and has a gas inlet opening (92h). The gas detection apparatus further includes a humidity computation section (7) which computes the humidity of the object atmosphere based on a ratio of a high-temperature-time voltage VH to a low-temperature-time voltage VL; and a clogging determination section (7) which determines the degree of clogging of the gas inlet opening based on a change in the humidity computed by the humidity computation section.
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公开(公告)号：US11428655B2
公开(公告)日：2022-08-30
申请号：US16749348
申请日：2020-01-22
摘要： A gas sensor (1) including a first gas detection element (2) and a second gas detection element (3), a first storage portion (4) having a first internal space (4A), and a first opening (4B) establishing communication between the first internal space (4A) and the outside space thereof exposed to a detection subject atmosphere, a second storage portion (5) having a second internal space (5A) and a second opening (5B) establishing communication between the second internal space (5A) and the outside space, a first membrane (4C) allowing permeation of water vapor and substantially not allowing permeation of a detection target gas, and covering the first opening (4B), and a calculation unit (12) for calculating the concentration of a detection target gas contained in the detection subject atmosphere, based on outputs from the first and second gas detection elements (2, 3), respectively.
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公开(公告)号：US09709517B2
公开(公告)日：2017-07-18
申请号：US14608605
申请日：2015-01-29
发明人： Masaya Watanabe , Shoji Kitanoya , Daisuke Ichikawa , Masahiro Yamashita , Yusuke Matsukura , Kaoru Hisada
IPC分类号： G01N27/18 , G01N33/00 , G01N27/403 , G01N27/24 , G01N27/406
CPC分类号： G01N27/18 , G01N27/24 , G01N27/403 , G01N27/406 , G01N33/0009 , G01N33/0016 , G01N33/0027
摘要： A gas detector includes a detecting element, a circuit board, a housing case having a gas introduction hole, and a metal member which covers the gas introduction hole. The detecting element is disposed under the metal member. The gas detector further includes a detecting element wiring fusing prevention member which is electrically conductive and is electrically connected to a grounding line of the circuit board. The detecting element wiring fusing prevention member is disposed at a position such that the shortest distance between the metal member and the detecting element wiring fusing prevention member is smaller than that between the metal member and the detecting element.
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公开(公告)号：US09606075B2
公开(公告)日：2017-03-28
申请号：US14748975
申请日：2015-06-24
CPC分类号： G01N25/18 , G01N27/14 , G01N27/18 , G01N33/005
摘要： A first bridge fixed resistor (211) of a combustible gas detection apparatus (1) is composed of a resistor element which is less likely to deteriorate as compared with a second bridge fixed resistor (212) and a variable resistor section (213). The combustible gas detection apparatus (1) can judge a deteriorated state of at least one of the second bridge fixed resistor (212) and the variable resistor section (213) on the basis of the absolute value of a difference temperature ΔT which is the difference between a detection-time judgment temperature T1 and a reference judgment temperature T0. The combustible gas detection apparatus (1) obtains a corrected high-temperature-time voltage VH′ and a corrected low-temperature-time voltage VL′ through use of a voltage error ΔV1. Thus, a decrease in the accuracy in detecting the hydrogen concentration can be suppressed even when the resistance of the resistor section changes.
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公开(公告)号：US10983085B2
公开(公告)日：2021-04-20
申请号：US16050787
申请日：2018-07-31
IPC分类号： G01N27/407 , G01N33/00 , G01N27/16
摘要： Disclosed is a gas sensor for detecting a measurement target gas in a measurement gas atmosphere, including: a first sensor element; a first installation part defining a first inner space in which the first sensor element is installed; and a casing accommodating therein the first installation part. The casing has an opening formed to introduce the measurement target gas into an inside of the casing. The first installation part has: a first gas introduction hole formed to provide communication between the first inner space and the inside of the casing; and a membrane member arranged to cover the first gas introduction hole and having permeability to water vapor and substantially no permeability to the measurement target gas. At least a portion of the first installation part in contact with the membrane member is made of insulating ceramic material or resin material.
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公开(公告)号：US09829455B2
公开(公告)日：2017-11-28
申请号：US14555010
申请日：2014-11-26
摘要： A gas detector includes a gas detection element having a protection layer formed of an oxide film mainly containing tantalum oxide (Ta2O5). Since the protection layer has excellent condensed-water resistance, even when water droplets adhere thereto, the morphology thereof does not change from dense to porous. Thus, since a change in property of the protection layer, which would otherwise be caused by adhesion of water droplets, can be reduced in the gas detector, even when water droplets adhere to the outermost surface layer of the gas detection element, impurities can be prevented from entering the protection layer (the outermost surface layer), whereby a change in thermal capacity of the gas detection element can be reduced. Thus, the gas detection element of the gas detector has excellent alkali resistance and condensed-water resistance.
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公开(公告)号：US09279795B2
公开(公告)日：2016-03-08
申请号：US13942147
申请日：2013-07-15
CPC分类号： G01N33/0036 , G01N27/18
摘要： A flammable gas concentration detection apparatus (1) including an energization control unit (50) that switches the energization state of heating resistor (34) at regular time periods TW, and a gas concentration computation unit (7). The heating resistor has first and second set temperatures CH and CL. The voltage detected across the heating resistor at the first and second set temperatures corresponds to a high and low temperature voltage, respectively. The gas concentration computation unit computes the concentration of a flammable gas based on a first information group including an average high temperature voltage averaging the values of two temporally successive high temperature voltages, the low temperature voltage in a period of time between two high temperature voltages, and an environment temperature in the period of time in which the low temperature voltage is detected.
摘要翻译： 1.一种易燃气体浓度检测装置（1），具备在规定时间期间TW切换加热电阻器（34）的通电状态的通电控制部（50）和气体浓度计算部（7）。 加热电阻器具有第一和第二设定温度CH和CL。 在第一和第二设定温度下在加热电阻器两端检测到的电压分别对应于高温和低温电压。 气体浓度计算单元基于第一信息组来计算可燃气体的浓度，该第一信息组包括平均两个时间上连续的高温电压的值的平均高温电压，两个高温电压之间的一段时间内的低温电压， 以及在检测到低温电压的时间段内的环境温度。
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公开(公告)号：US11143614B2
公开(公告)日：2021-10-12
申请号：US16050807
申请日：2018-07-31
IPC分类号： G01N27/18 , G01N33/00 , G01N25/18 , G01N27/16 , G01N27/407
摘要： Disclosed is a gas sensor for detecting a measurement target gas in a measurement gas atmosphere, including first and second sensor elements respectively installed in first and second inner spaces of first and second installation parts. The first and second sensor elements have respective heating resistors connected in series and each has a resistance value that varies with change in temperature thereof so that the concentration of the measurement target gas can be calculated according to a potential between the heating resistors of the first and second sensor elements with the application of a constant voltage. The first and second installation parts are located at such positions that allow a maximum temperature difference of 0.4° C. or less between the first and second inner spaces during change in atmosphere temperature from 0° C. to 80° C.
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