JP2006177863A - Calibration method, and gas detector having calibration function - Google Patents

Calibration method, and gas detector having calibration function Download PDF

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JP2006177863A
JP2006177863A JP2004373102A JP2004373102A JP2006177863A JP 2006177863 A JP2006177863 A JP 2006177863A JP 2004373102 A JP2004373102 A JP 2004373102A JP 2004373102 A JP2004373102 A JP 2004373102A JP 2006177863 A JP2006177863 A JP 2006177863A
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gas
combustion type
catalytic combustion
gas sensor
calibration
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Haruichi Otani
晴一 大谷
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Riken Keiki KK
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Riken Keiki KK
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Abstract

<P>PROBLEM TO BE SOLVED: To calibrate the zero point without using standard gas. <P>SOLUTION: This gas detector using a contact burn-up type gas sensor 1 as a detecting means comprises a gas flow inlet sealing means 4 for preventing inflow of inspected gas to the contact burn-up type gas sensor 1, and a measuring circuit 9 for setting, as the zero point, the indication value of the contact burn-up type gas sensor 1 in the state where the inflow of inspected gas is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、接触燃焼式ガスセンサーの零点を校正する機能を備えたガス検出装置に関する。   The present invention relates to a gas detection device having a function of calibrating a zero point of a catalytic combustion type gas sensor.

ガスセンサーは、経時変化により零点が変動するため、定期的に零点を補正または修正する必要がある。このような零点の補正は、特許文献１に見られるようなキャップをガスセンサーのガス流入口に装着、封止してキャップの空間に標準ガスを注入することにより行われている。
実開昭62-163747号公報 Since the zero point of the gas sensor fluctuates due to changes over time, it is necessary to periodically correct or correct the zero point. Such zero point correction is performed by mounting a cap as shown in Patent Document 1 on the gas inlet of the gas sensor, sealing it, and injecting a standard gas into the space of the cap.
Japanese Utility Model Publication No. 62-163747

しかしながら、キャップや標準ガスを用意して、キャップ内に標準ガスを注入するという操作が必要となり、校正作業が複雑化するという問題ある。
本発明はこのような問題に鑑みてなされたものでありその目的とするところは、標準ガスやその注入操作を不要とした零点校正機能を備えたガス検出装置を提供することである。 However, there is a problem that the operation of preparing a cap and standard gas and injecting the standard gas into the cap is required, and the calibration work becomes complicated.
The present invention has been made in view of such problems, and an object of the present invention is to provide a gas detection device having a zero point calibration function that eliminates the need for standard gas and its injection operation.

このような課題を達成するために請求項１の発明は、接触燃焼式ガスセンサーを検出手段とするガス検出装置のガス流入口を封止する工程と、前記前記接触燃焼式ガスセンサーにより可燃性ガスが実質的に消費された時点の出力を零指示値として校正するように構成されている。   In order to achieve such an object, the invention of claim 1 is characterized in that a gas inlet of a gas detection device using a catalytic combustion type gas sensor as a detecting means is sealed, and that the catalytic combustion type gas sensor is flammable. The output at the time when the gas is substantially consumed is calibrated as a zero indication value.

また、請求項２の発明は、接触燃焼式ガスセンサーを検出手段とするガス検出装置において、前記接触燃焼式ガスセンサーへの被検ガスの流入を阻止するガス流入口封止手段と、被検ガスの流入が阻止された状態での前記接触燃焼式ガスセンサーの指示値を零点とする測定回路とを備える。   According to a second aspect of the present invention, there is provided a gas detection device having a catalytic combustion type gas sensor as a detection unit, a gas inlet sealing means for blocking the flow of the test gas into the catalytic combustion type gas sensor, A measurement circuit having a zero point as an indicated value of the catalytic combustion type gas sensor in a state where gas inflow is blocked.

接触燃焼式ガスセンサーへの被検ガスの流入を阻止するという操作だけで、ガスセンサーに零点校正用のガスを供給でき、標準ガスを必要とすることなく測定装置の零点を簡単に校正することができる。   The gas for zero calibration can be supplied to the gas sensor simply by blocking the flow of the test gas to the catalytic combustion type gas sensor, and the zero of the measuring device can be easily calibrated without the need for a standard gas. Can do.

図１は、本発明の一実施例を示すものであって、接触燃焼式ガスセンサー１は、ガス流入口２ａを備えたケース２に接触燃焼式ガス検出素子３を収容して構成されている。ガスセンサー１の近傍には、この実施例では校正信号により作動する駆動手段５によりガス流入口２ａに対して図中矢印Ａで示すように進退するシャッタ板６を設けて構成されたガス流入口封止手段４が配置されている。   FIG. 1 shows an embodiment of the present invention. A catalytic combustion type gas sensor 1 is configured by housing a catalytic combustion type gas detection element 3 in a case 2 having a gas inlet 2a. . In the vicinity of the gas sensor 1, in this embodiment, a gas inlet configured by providing a shutter plate 6 that moves forward and backward as indicated by an arrow A in the figure with respect to the gas inlet 2 a by a driving means 5 that operates according to a calibration signal. Sealing means 4 is arranged.

接触燃焼式ガス検出素子３は、周知のように図２に見られるごとく、ヒータ３１と、これの表面に電気的には絶縁し、かつ熱伝導関係を維持するための層３２を形成し、この層３２の表面に酸化触媒層３３を形成することにより構成されていて、被検ガスである燃焼性ガスを酸化触媒層３３の触媒作用により燃焼させ、その温度上昇をヒータ３１の電気抵抗の変化として検出するものである。   As is well known, the catalytic combustion type gas detection element 3 forms a heater 31 and a layer 32 for electrically insulating and maintaining a heat conduction relationship on the surface of the heater 31, as shown in FIG. The oxidation catalyst layer 33 is formed on the surface of the layer 32, and the combustible gas as the test gas is burned by the catalytic action of the oxidation catalyst layer 33, and the temperature rise is reduced by the electric resistance of the heater 31. It is detected as a change.

再び図１に戻って、接触燃焼式ガスセンサー１は、基準抵抗７を介して好ましくは定電圧電源８に接続され、基準抵抗７、もしくはガスセンサーのいずれかの端子電圧を検出信号として測定回路９に取り込むように構成されている。   Returning to FIG. 1 again, the catalytic combustion type gas sensor 1 is preferably connected to a constant voltage power source 8 through a reference resistor 7, and a measurement circuit using the terminal voltage of either the reference resistor 7 or the gas sensor as a detection signal. 9 to capture.

測定回路９は、零ガス状態、つまり被検ガスが存在しない状態での検出信号による指示値が零となるように調整する零点調整機能と、少なくとも２つの異なる濃度を有する被検ガスの指示範囲を所定の値に調整する、いわゆるスパン調整機能とを備えている。   The measurement circuit 9 includes a zero point adjustment function for adjusting the indicated value based on the detection signal in a zero gas state, that is, a state in which no test gas is present, to zero, and an indication range for the test gas having at least two different concentrations. And a so-called span adjustment function for adjusting the value to a predetermined value.

校正制御手段１０は、校正指令釦１１が押圧された時点で、ガス流入口封止手段４を作動させてガスセンサーのガス流入口２ａを実質的に封止させ、所定時間の経過後の検出信号を零点とするように測定回路９に指令するように構成されている。   When the calibration command button 11 is pressed, the calibration control means 10 operates the gas inlet sealing means 4 to substantially seal the gas inlet 2a of the gas sensor, and detects after a predetermined time has elapsed. The measurement circuit 9 is instructed to set the signal to the zero point.

この実施例において、零点を校正すべく校正指令釦１１を押圧すると、校正制御手段１０はガス流入口封止手段４によりガスセンサーのガス流入口２ａを実質的に封止する（なお、実質的に封止するとは、接触燃焼式ガス検出素子３による可燃性ガスの消費量に対してガス流入口２ａから漏洩により流入する量が無視できる状態での封止を意味する）。これによりケース２の内部の燃焼性ガスが接触燃焼性ガス検出素子３により酸化されて消費され、当初２０００ｐｐｍの濃度であった可燃性ガスは、所定時間が経過した時点Ｔ１では被検ガスが実質的に零ガス状態となる。なお、実質的に零ガス状態とは、接触燃焼式ガス検出素子３が当該ガスに対して感応しない程度以下まで濃度が低下した状態をいう。   In this embodiment, when the calibration command button 11 is pressed to calibrate the zero point, the calibration control means 10 substantially seals the gas inlet 2a of the gas sensor with the gas inlet sealing means 4 (substantially substantially Sealing means that the amount of inflow due to leakage from the gas inlet 2a is negligible with respect to the amount of combustible gas consumed by the catalytic combustion type gas detection element 3). As a result, the combustible gas inside the case 2 is oxidized and consumed by the contact combustible gas detection element 3, and the combustible gas having a concentration of 2000 ppm at the beginning is substantially the test gas at the time T1 when a predetermined time has elapsed. Thus, a zero gas state is obtained. Note that the substantially zero gas state means a state where the concentration has decreased to a level where the catalytic combustion type gas detection element 3 is not sensitive to the gas.

校正制御手段１０は、測定回路９に指令を出力してこの時点の検出信号を取り込んで指示値がゼロとなるように調整させる。なお、零点調整が終了した段階で校正制御手段１０は、ガス流入口封止手段４によりガス流入口２ａを開放させて次の測定を可能ならしめる。   The calibration control means 10 outputs a command to the measurement circuit 9 and takes in the detection signal at this time so as to adjust the indicated value to zero. When the zero point adjustment is completed, the calibration control means 10 opens the gas inlet 2a by the gas inlet sealing means 4 so that the next measurement can be performed.

なお、上述の実施例においては、ガス流入口封止手段４を測定装置に内蔵させているが、校正指令釦１１が押圧された場合に測定表示装置の表示手段、例えば液晶パネルに「ガス流入口を遮蔽してください」などのコメントを表示させて、ガス流入口２ａを手動で封止させるようにしても同様の作用を奏する。   In the above-described embodiment, the gas inlet sealing means 4 is built in the measuring device. However, when the calibration command button 11 is pressed, the display means of the measuring display device, for example, a liquid crystal panel displays “gas flow”. Even if the comment such as “Please shield the inlet” is displayed and the gas inlet 2a is manually sealed, the same effect is obtained.

なお、上述の実施例においては、ガス流入口２ａを備えたケース２に接触燃焼式ガス検出素子３を収容して、ガス流入口２ａから拡散により被測定流体を取り込む形式のものについて説明したが、接触燃焼式ガス検出素子を密閉容器に収容して流路によりポンプなどの送気手段に接続して強制的に被測定流体を取り込む形式の接触燃焼式ガスセンサーにあっては、流路を閉塞するための弁等のガス流入口封止手段を接続することにより同様の作用を奏することは明らかである。   In the above-described embodiment, the case where the contact combustion type gas detection element 3 is accommodated in the case 2 having the gas inlet 2a and the fluid to be measured is taken in from the gas inlet 2a by diffusion is described. In the case of a contact combustion type gas sensor in which a catalytic combustion type gas detection element is housed in an airtight container and connected to an air supply means such as a pump by a flow path to forcibly take in a fluid to be measured, the flow path is It is clear that the same effect can be obtained by connecting a gas inlet sealing means such as a valve for closing.

本発明の一実施例を示す図である。It is a figure which shows one Example of this invention. 接触燃焼式ガス検出素子の一実施例を示す図である。It is a figure which shows one Example of a contact combustion type gas detection element. 同上装置の零点校正時における接触燃焼式ガス検出素子の出力変化を示す図である。It is a figure which shows the output change of the contact combustion type gas detection element at the time of zero point calibration of an apparatus same as the above.

符号の説明Explanation of symbols

１接触燃焼式ガスセンサー
２ａ ガス流入口
２ ケース
３ 接触燃焼式ガス検出素子
４ ガス流入口封止手段
５ 駆動手段
６ シャッタ板 1 contact combustion type gas sensor 2a gas inlet 2 case 3 contact combustion type gas detecting element 4 gas inlet sealing means 5 driving means 6 shutter plate

Claims (3)

接触燃焼式ガスセンサーを検出手段とするガス検出装置のガス流入口を封止する工程と、前記前記接触燃焼式ガスセンサーにより可燃性ガスが実質的に消費された時点の出力を零指示値として校正することを特徴とする校正方法。 A step of sealing a gas inlet of a gas detection device using a catalytic combustion type gas sensor as a detection means, and an output at the time when the combustible gas is substantially consumed by the catalytic combustion type gas sensor as a zero indication value A calibration method characterized by calibrating. 接触燃焼式ガスセンサーを検出手段とするガス検出装置において、前記接触燃焼式ガスセンサーへの被検ガスの流入を阻止するガス流入口封止手段と、被検ガスの流入が阻止された状態での前記接触燃焼式ガスセンサーの指示値を零点とする測定回路とを備えたガス検出装置。 In the gas detection device using the catalytic combustion type gas sensor as the detection means, the gas inlet sealing means for blocking the inflow of the test gas to the catalytic combustion type gas sensor, and the inflow of the test gas are blocked A gas detection apparatus comprising: a measurement circuit having a zero point as an indication value of the catalytic combustion type gas sensor. 前記ガス流入口封止手段が外部からの校正指令に基づいて前記接触燃焼式ガスセンサーのガス流入口を封止する請求項２に記載のガス検出装置。 The gas detection device according to claim 2, wherein the gas inlet sealing means seals the gas inlet of the catalytic combustion type gas sensor based on a calibration command from the outside.
JP2004373102A 2004-12-24 2004-12-24 Calibration method, and gas detector having calibration function Pending JP2006177863A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013545068A (en) * 2010-11-01 2013-12-19 コーニンクレッカ フィリップス エヌ ヴェ How to calibrate an air sensor
JP2015224892A (en) * 2014-05-26 2015-12-14 理研計器株式会社 Gas detector
CN105628752A (en) * 2014-11-28 2016-06-01 国网青海省电力公司电力科学研究院 Calibration method of electrochemical sensor
CN107490613A (en) * 2017-07-31 2017-12-19 广东美的制冷设备有限公司 Electrochemical gas sensor and its calibration method, air conditioner
CN109738581A (en) * 2018-12-24 2019-05-10 国网北京市电力公司 System, the method and apparatus of the test of gas-detecting device
CN109975635A (en) * 2019-03-19 2019-07-05 光力科技股份有限公司 A kind of methane electric locking function test method and system
CN112740032A (en) * 2018-06-22 2021-04-30 萨尔大学 Method and apparatus for calibrating a fluid detector with a pre-concentrator
JP7010446B2 (en) 2016-09-27 2022-01-26 株式会社アロマビット Smell measuring device and odor measuring system

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JP2001041916A (en) * 1999-05-21 2001-02-16 Daikin Ind Ltd Gas detector
JP2003172717A (en) * 2001-12-06 2003-06-20 Daikin Ind Ltd Gas detector
JP2004347601A (en) * 2003-05-21 2004-12-09 General Electric Co <Ge> Combustible gas detector having circulation sensor container, and combustible gas measuring method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001041916A (en) * 1999-05-21 2001-02-16 Daikin Ind Ltd Gas detector
JP2003172717A (en) * 2001-12-06 2003-06-20 Daikin Ind Ltd Gas detector
JP2004347601A (en) * 2003-05-21 2004-12-09 General Electric Co <Ge> Combustible gas detector having circulation sensor container, and combustible gas measuring method

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013545068A (en) * 2010-11-01 2013-12-19 コーニンクレッカ フィリップス エヌ ヴェ How to calibrate an air sensor
US9347925B2 (en) 2010-11-01 2016-05-24 Koninklijke Philips N.V. Method of calibrating an air sensor
JP2015224892A (en) * 2014-05-26 2015-12-14 理研計器株式会社 Gas detector
CN105628752A (en) * 2014-11-28 2016-06-01 国网青海省电力公司电力科学研究院 Calibration method of electrochemical sensor
CN105628752B (en) * 2014-11-28 2019-03-26 国网青海省电力公司电力科学研究院 The scaling method of electrochemical sensor
JP7010446B2 (en) 2016-09-27 2022-01-26 株式会社アロマビット Smell measuring device and odor measuring system
CN107490613A (en) * 2017-07-31 2017-12-19 广东美的制冷设备有限公司 Electrochemical gas sensor and its calibration method, air conditioner
CN112740032A (en) * 2018-06-22 2021-04-30 萨尔大学 Method and apparatus for calibrating a fluid detector with a pre-concentrator
CN112740032B (en) * 2018-06-22 2024-05-10 萨尔大学 Method and apparatus for calibrating a fluid detector having a preconcentrator
CN109738581A (en) * 2018-12-24 2019-05-10 国网北京市电力公司 System, the method and apparatus of the test of gas-detecting device
CN109975635A (en) * 2019-03-19 2019-07-05 光力科技股份有限公司 A kind of methane electric locking function test method and system
CN109975635B (en) * 2019-03-19 2021-09-07 光力科技股份有限公司 Methane electric locking function test method and system

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