JP2007139580A - Device of generating zero-gas air for gas detection device - Google Patents

Device of generating zero-gas air for gas detection device Download PDF

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JP2007139580A
JP2007139580A JP2005333691A JP2005333691A JP2007139580A JP 2007139580 A JP2007139580 A JP 2007139580A JP 2005333691 A JP2005333691 A JP 2005333691A JP 2005333691 A JP2005333691 A JP 2005333691A JP 2007139580 A JP2007139580 A JP 2007139580A
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air
adsorbent
zero
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JP4721341B2 (en
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Tomohiro Kawaguchi
智博 河口
Yasuhiro Setoguchi
泰弘 瀬戸口
Takao Nishimura
隆雄 西村
Akiko Yamaoka
明子 山岡
Aya Haruta
亜耶 春田
Toshio Matsumura
年郎 松村
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Figaro Engineering Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of generating simply reliable zero-gas air. <P>SOLUTION: A permeable metal partition 8 is set inside a container 4, and an adsorbent 6 is filled outside. The air in an inside space 10 is purified by the adsorbent 6, and a sensor probe 12 is inserted, and the air is used as clean air for zero-point calibration. Though a granular active carbon is used for the adsorbent 6 in an execution sample, its shape can be selected optionally, for example, a sheet shape. The metal partition 8 may be formed by sticking a wire mesh for preventing invasion of fine powder of the adsorbent 6 or a gas permeable membrane such as a polytetrafluoroethylene film or the like onto a metal cylinder provided with many small holes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、VOC検出装置などのガス検出装置での、ガスセンサの校正用の０ガス空気の発生に関する。   The present invention relates to generation of zero gas air for gas sensor calibration in a gas detection device such as a VOC detection device.

金属酸化物半導体ガスセンサなどのガスセンサを用いて、VOCや口臭、呼気中のアルコールなどの濃度を測定することが知られている。このような検出装置では０ガス空気、即ち可燃性ガスやVOC、口臭成分、アルコールなどを含まないクリーンな空気を必要とする。従来例として一般に知られている０ガス空気の発生装置６０を図６に示す。６２は活性炭やゼオライト、シリカゲルなどの吸着剤で、６４はガラスウールなどのメッシュ、６６はメッシュ６４よりも上部の空きスペース、即ちヘッドスペースである。そしてヘッドスペース６６内にセンサプローブ１２を挿入し、クリーンエア中でのセンサ信号を測定し、センサを校正する。この手法はヘッドスペース法と呼ばれる。   It is known to measure the concentration of VOCs, bad breath, alcohol in breath and the like using a gas sensor such as a metal oxide semiconductor gas sensor. Such a detector requires zero gas air, that is, clean air that does not contain combustible gas, VOC, bad breath components, alcohol, and the like. FIG. 6 shows a zero gas air generator 60 generally known as a conventional example. 62 is an adsorbent such as activated carbon, zeolite, or silica gel, 64 is a mesh such as glass wool, and 66 is an empty space above the mesh 64, that is, a head space. Then, the sensor probe 12 is inserted into the head space 66, the sensor signal in clean air is measured, and the sensor is calibrated. This method is called the headspace method.

発明者は、ヘッドスペース法で測定したセンサ信号と、高純度空気（絶対湿度が一定で、空気以外の可燃性ガスなどの成分を含まない空気）中で測定したセンサ信号、との相関が低いことを見出した（図４）。またヘッドスペース法の校正容器内にガスセンサをセットした状態で、VOC成分を注入すると、センサ信号がVOC成分に感応してからの復帰が遅いことを見出した（図５）。これらのことは、ヘッドスペース法で得られる０ガス空気は、VOCや口臭などの微量成分ガスを検出するには、不適当であることを示している。かといって高純度空気のボンベをガスセンサの校正に使用すると、ボンベの重量や使用回数の制限のため不便である。また加熱した空気浄化触媒で空気を浄化して校正用空気とすると、電力が必要になる。   The inventor has a low correlation between a sensor signal measured by the headspace method and a sensor signal measured in high-purity air (air having a constant absolute humidity and containing no combustible gas other than air). (FIG. 4). We also found that when a VOC component was injected with a gas sensor set in a calibration container for the headspace method, the sensor signal returned to the VOC component and then returned slowly (FIG. 5). These facts indicate that the zero gas air obtained by the headspace method is inappropriate for detecting trace component gases such as VOC and bad breath. However, using a cylinder of high-purity air for calibration of the gas sensor is inconvenient due to the limitation of the cylinder weight and the number of uses. Further, if the air is purified with a heated air purification catalyst to obtain calibration air, electric power is required.

この発明の課題は、高純度空気のボンベや加熱型の空気浄化触媒を用いずに簡単に、VOCや口臭などの微量成分を検出する際の校正用空気として使用できる、０ガス空気の発生装置を提供することにある。
この発明の追加の課題は、ガスセンサのヒータからの熱により吸着剤からのガスの脱離が生じることを防止することにある。
この発明の他の追加の課題は、ガスセンサが湿度の影響を受ける際に、０ガス空気の発生装置内の湿度と、測定対象の湿度とが異なることの影響を防止することにある。 An object of the present invention is a zero gas air generator that can be used as calibration air when detecting trace components such as VOC and bad breath easily without using a high-purity air cylinder or a heated air purification catalyst. Is to provide.
An additional object of the present invention is to prevent the desorption of gas from the adsorbent due to heat from the heater of the gas sensor.
Another object of the present invention is to prevent the influence of the humidity in the generator of zero gas air being different from the humidity of the measurement object when the gas sensor is affected by the humidity.

この発明は、容器内にガスの吸着剤を収容して、ガス検出装置のガスセンサを挿入し、その０点を校正するための０ガス空気の発生装置において、
前記容器内に通気性を備えた筒状の仕切り部材を設けて、その外側のスペースに吸着剤を収容することにより、仕切り部材の内側の空気を外側の吸着剤で浄化すると共に、仕切り部材の内側のスペースにガスセンサを挿入自在にしたことを特徴とする。
ガスセンサの種類は、金属酸化物半導体ガスセンサや、固体電解質ガスセンサ、電気化学式ガスセンサなどで、任意である。ガス検出装置は好ましくは携帯用とする。 This invention is a zero gas air generator for containing a gas adsorbent in a container, inserting a gas sensor of a gas detector, and calibrating the zero point thereof.
By providing a cylindrical partition member with air permeability in the container and storing the adsorbent in the outer space, the air inside the partition member is purified with the outer adsorbent, and the partition member The gas sensor can be freely inserted into the inner space.
The type of the gas sensor is arbitrary, such as a metal oxide semiconductor gas sensor, a solid electrolyte gas sensor, or an electrochemical gas sensor. The gas detection device is preferably portable.

好ましくは、金属酸化物半導体ガスセンサや固体電解質ガスセンサなどのヒータを備えたガスセンサを校正するために、前記仕切り部材を多数の穴を備えた金属により構成する。この場合、仕切り部材は金属メッシュで作成した筒とする。あるいは仕切り部材を多数の小穴を設けた金属筒などとし、好ましくは穴に金属メッシュや気体透過膜などを取り付けて、吸着剤が仕切り部材の内側へ入り込むのを防止する。   Preferably, in order to calibrate a gas sensor having a heater such as a metal oxide semiconductor gas sensor or a solid electrolyte gas sensor, the partition member is made of a metal having a large number of holes. In this case, the partition member is a cylinder made of a metal mesh. Alternatively, the partition member is a metal cylinder provided with a large number of small holes, and preferably a metal mesh or a gas permeable membrane is attached to the holes to prevent the adsorbent from entering the partition member.

特に好ましくは、前記ガスセンサが金属酸化物半導体ガスセンサで、少なくともガスセンサと湿度センサとを備えたセンサプローブを前記内側のスペースに挿入してガスセンサを校正する。湿度センサは絶対湿度センサでも相対湿度センサでも良く、ガスセンサが絶対湿度の影響を受ける場合、例えば相対湿度センサと温度センサ、あるいは是退室度センサをセンサプローブ内に設ける。   Particularly preferably, the gas sensor is a metal oxide semiconductor gas sensor, and a sensor probe including at least a gas sensor and a humidity sensor is inserted into the inner space to calibrate the gas sensor. The humidity sensor may be an absolute humidity sensor or a relative humidity sensor. When the gas sensor is affected by the absolute humidity, for example, a relative humidity sensor and a temperature sensor or a retreat room degree sensor are provided in the sensor probe.

この発明では、高純度空気による校正と同等の校正ができる０ガス空気の発生装置が簡単に得られ、高純度空気のボンベや空気浄化触媒の電力などを必要としない。   In the present invention, a zero gas air generator capable of performing a calibration equivalent to the calibration with high-purity air can be easily obtained, and the power of the high-purity air cylinder or the air purification catalyst is not required.

請求項２の発明では、ガスセンサのヒータからの熱により吸着剤が加熱されて、ガスが脱離し、校正ができなくなることを防止できる。   In the invention of claim 2, it can be prevented that the adsorbent is heated by the heat from the heater of the gas sensor and the gas is desorbed and cannot be calibrated.

請求項３の発明では、センサプローブに湿度センサを設けることにより、湿度の影響を受けやすい金属酸化物半導体ガスセンサに対して、校正用容器の内外で湿度が異なるため、校正が難しくなるとの問題を解決できる。   In the invention of claim 3, by providing a humidity sensor in the sensor probe, the humidity is different between the inside and outside of the calibration container for the metal oxide semiconductor gas sensor that is easily affected by humidity, and therefore the calibration is difficult. can be solved.

以下に本発明を実施するための最適実施例を示す。   In the following, an optimum embodiment for carrying out the present invention will be shown.

図１〜図５に、実施例とその特性とを示す。図において、２は０ガス空気の発生装置で、４はガラスや金属などの気密な容器であり、その内容積は例えば１５０cm3である。容器４内には活性炭やゼオライトあるいはシリカゲルなどの吸着剤を収容し、８は金属製仕切りで、例えば金属メッシュを２重に巻いて底を取り付けた筒状の仕切りで、仕切り８の内外の間には通気性がある。１０は金属製仕切り８の内側スペースで、この部分にガスセンサを備えたセンサプローブ１２を挿入し、内側スペース１０内の空気を可燃性ガスやVOC成分などを含まないクリーンエアとしてガスセンサの０点校正を行う。なおプローブ１２を挿入しない場合、キャップ１６で容器４を閉じられるようにする。 1 to 5 show examples and their characteristics. In the figure, 2 is a generator of 0 gas air, 4 is an airtight container such as glass or metal, and its internal volume is, for example, 150 cm 3 . An adsorbent such as activated carbon, zeolite, or silica gel is accommodated in the container 4, 8 is a metal partition, for example, a cylindrical partition in which a metal mesh is wound twice and a bottom is attached, between the inside and outside of the partition 8. Is breathable. 10 is an inner space of the metal partition 8, and a sensor probe 12 equipped with a gas sensor is inserted into this space, and the air in the inner space 10 is zero-point calibrated as clean air containing no flammable gas or VOC components. I do. If the probe 12 is not inserted, the container 4 is closed with the cap 16.

吸着剤６は実施例では粒状活性炭を用いたが、その形態はシート状などでもよく任意である。また金属製仕切り８は、多数の小穴を設けた金属の筒に、吸着剤６の微粉が侵入するのを防止するための金網や、ポリテトラフルオラエチレン膜などの気体透過膜などを貼り付けたものとしても良い。また金属製仕切り８に代えて、陶器に多数の穴を設けた仕切りに金網や気体透過膜などを取り付けても良い。金属製仕切り８の役割は、吸着剤６のある部分と、吸着剤６の無い内側スペース１０とを区分し、内側スペース１０への吸着剤６の微粉などの侵入を防止することである。また金属製仕切り８は、センサプローブ１２内のガスセンサからの発熱が、吸着剤６に伝わってガスを脱離させることがないようにすることにある。即ち金属製仕切り８は、センサプローブ１２と吸着剤６とを断熱する。１４はセンサプローブ１２の先端に設けた通気孔で、この内側にガスセンサ２０、温度センサ２１，相対湿度センサ２２がある。   As the adsorbent 6, granular activated carbon is used in the embodiment, but the form thereof may be a sheet shape or the like. The metal partition 8 is affixed with a metal net for preventing fine powder of the adsorbent 6 from entering a metal cylinder provided with a large number of small holes or a gas permeable film such as a polytetrafluoroethylene film. Also good. Further, instead of the metal partition 8, a metal net or a gas permeable membrane may be attached to a partition provided with a large number of holes in a pottery. The role of the metal partition 8 is to separate a portion where the adsorbent 6 is present and an inner space 10 where the adsorbent 6 is not present, and prevent the adsorbent 6 from entering the inner space 10 with fine powder. Further, the metal partition 8 is intended to prevent the heat generated from the gas sensor in the sensor probe 12 from being transmitted to the adsorbent 6 and desorbing the gas. That is, the metal partition 8 insulates the sensor probe 12 and the adsorbent 6 from each other. Reference numeral 14 denotes a vent hole provided at the tip of the sensor probe 12, which includes a gas sensor 20, a temperature sensor 21, and a relative humidity sensor 22.

図２にガス検出装置の構成を示すと、センサプローブ１２内にはガスセンサ２０とサーミスタなどの温度センサ２１及び相対湿度センサ２２があり、ここではガスセンサ２０にヒータを備えた金属酸化物半導体ガスセンサを用いる、そのセンサ信号は例えば抵抗値である。微量のガス以外に、周囲の絶対湿度がガスセンサ２０の特性に影響するので、温度センサ２１と相対湿度センサ２２とに代えて、絶対湿度センサを用いても良い。またガスセンサ２０は金属酸化物半導体を加熱するためのヒータを備えているので、センサプローブ１２からの発熱が問題になる。   FIG. 2 shows the configuration of the gas detection apparatus. In the sensor probe 12, there are a gas sensor 20, a temperature sensor 21 such as a thermistor, and a relative humidity sensor 22. Here, the gas sensor 20 includes a metal oxide semiconductor gas sensor having a heater. The sensor signal used is, for example, a resistance value. Since the ambient absolute humidity affects the characteristics of the gas sensor 20 in addition to a small amount of gas, an absolute humidity sensor may be used in place of the temperature sensor 21 and the relative humidity sensor 22. Further, since the gas sensor 20 includes a heater for heating the metal oxide semiconductor, heat generation from the sensor probe 12 becomes a problem.

２４はセンサ電源で、センサ２０〜２２に電力を供給し、特にガスセンサ２０のヒータに電力を供給する。ＡＤコンバータ２６はセンサ２０〜２２の出力をＡＤ変換し、これらの信号を温湿度補正部２８へ入力して、ガスセンサ２０に対する周囲温度の影響並びに相対湿度の影響を補正する。なお金属酸化物半導体ガスセンサに対する温湿度補正の手法自体は公知である。   A sensor power supply 24 supplies power to the sensors 20 to 22, and particularly supplies power to the heater of the gas sensor 20. The AD converter 26 AD-converts the outputs of the sensors 20 to 22 and inputs these signals to the temperature / humidity correction unit 28 to correct the influence of the ambient temperature and the relative humidity on the gas sensor 20. The temperature / humidity correction method for the metal oxide semiconductor gas sensor itself is well known.

０点記憶部３０は、ガス検出装置の校正スイッチがオンされた際の温湿度補正部２８の出力を、クリーンエア中でのガスセンサ信号として記憶する。実施例では、温湿度補正済のガスセンサの抵抗値を、クリーンエア中のセンサ抵抗として記憶する。VOC検出部３２は温湿度補正済のセンサ抵抗と、０点記憶部に記憶したセンサ抵抗との比などを用いて、VOC濃度を検出する。検出結果は液晶パネルなどの表示器３４に表示され、またデータロガー３６に記憶される。   The zero point storage unit 30 stores the output of the temperature / humidity correction unit 28 when the calibration switch of the gas detection device is turned on as a gas sensor signal in clean air. In the embodiment, the resistance value of the gas sensor corrected for temperature and humidity is stored as the sensor resistance in clean air. The VOC detection unit 32 detects the VOC concentration by using a ratio between the sensor resistance after temperature / humidity correction and the sensor resistance stored in the zero point storage unit. The detection result is displayed on a display 34 such as a liquid crystal panel, and stored in a data logger 36.

実施例の０ガス空気の発生装置２は、携帯用のガス検出装置に用いるのに適しているが、定置型のガス検出装置にも用いることができる。VOCのように微量のガスを検出する場合、クリーンエアも充分清浄である必要があり、実施例の０ガス空気の発生装置２が特に適している。VOCの検出以外に例えば口臭の検出のように微量のガスを検出する場合にも、実施例の０ガス空気の発生装置２が適している。   The zero gas air generator 2 of the embodiment is suitable for use in a portable gas detector, but can also be used in a stationary gas detector. When detecting a very small amount of gas such as VOC, clean air needs to be sufficiently clean, and the zero gas air generator 2 of the embodiment is particularly suitable. In addition to the detection of VOC, the zero gas air generator 2 of the embodiment is also suitable for detecting a very small amount of gas, for example, detecting bad breath.

ガスセンサ２０はここでは金属酸化物半導体ガスセンサとしたが、これ以外に電気化学式のガスセンサや固体電解質ガスセンサなどでも良い。図３〜図４に、実施例の０ガス空気の発生装置２による校正結果を示す。各図において、高純度空気はボンベに充填したクリーンエアである。なおガスセンサの抵抗値は絶対湿度の影響を受けるが、温湿度補正部２８でこれを補正済の信号を用いるので、高純度空気中とそれ以外の雰囲気中、並びに０ガス空気の発生装置２中での湿度の相違は影響しない。また図３〜図５において、ヘッドスペース法は図６の装置６０を用いた際の結果で、発生装置６０の容器内の容積や、吸着剤の使用量は実施例とほぼ同等である。図３，図４での測定は所定の校正用雰囲気にセンサプローブをセットした後、約１０分待機し、校正スイッチをオンして抵抗値を測定した。   The gas sensor 20 is a metal oxide semiconductor gas sensor here, but may be an electrochemical gas sensor, a solid electrolyte gas sensor, or the like. The calibration result by the generator 2 of 0 gas air of an Example is shown in FIGS. In each figure, high purity air is clean air filled in a cylinder. Although the resistance value of the gas sensor is affected by the absolute humidity, since the signal corrected by the temperature / humidity correction unit 28 is used, in the high-purity air and other atmospheres, and in the 0 gas air generator 2 The difference in humidity is not affected. 3 to 5, the head space method is a result when the apparatus 60 of FIG. 6 is used, and the volume in the container of the generator 60 and the amount of adsorbent used are almost the same as those in the example. 3 and 4, the sensor probe was set in a predetermined calibration atmosphere, waited for about 10 minutes, the calibration switch was turned on, and the resistance value was measured.

図３は複数台のガス検出装置を用意し、それらを高純度空気中、実施例の校正用容器中、ヘッドスペース法の容器中で、湿度補正済みのセンサ抵抗を読み込んだ際の結果である。図３から分かるように、高純度空気中でのセンサ抵抗値と実施例でのセンサ抵抗値はほぼ等しい。これに対してヘッドスペース法での抵抗値は、高純度空気中でのセンサ抵抗値の１／２程度であり、ヘッドスペース法で得られるクリーンエア中にはセンサ抵抗に影響する何らかの物質が含まれている。これは、ヘッドスペース法では吸着剤６２によるヘッドスペース６６内の空気の浄化が遅いことと、センサプローブ１２に付着したガスや揮発性物質が影響しているものと思われる。   FIG. 3 shows the results when a plurality of gas detectors are prepared and humidity-corrected sensor resistances are read in high-purity air, in the calibration container of the example, and in the headspace method container. . As can be seen from FIG. 3, the sensor resistance value in high-purity air and the sensor resistance value in the example are substantially equal. On the other hand, the resistance value by the headspace method is about ½ of the sensor resistance value in high-purity air, and the clean air obtained by the headspace method contains some substance that affects the sensor resistance. It is. This seems to be due to the slow purification of the air in the head space 66 by the adsorbent 62 in the head space method and the gas and volatile substances adhering to the sensor probe 12.

図４は約３ヶ月の間の、ヘッドスペース法でのクリーンエア中のセンサ抵抗値と、実施例の０ガス空気の発生装置２内でのセンサ抵抗値と、高純度空気中でのセンサ抵抗値との推移を示したものである。用いたガス検出装置は１台で、いずれのセンサ抵抗値も温湿度を補正済である。実施例でのセンサ抵抗値と高純度空気中でのセンサ抵抗値はほぼ等しいが、ヘッドスペース法との間では２〜３倍程度の抵抗値の開きがある。   FIG. 4 shows a sensor resistance value in clean air by the headspace method, a sensor resistance value in the zero gas air generator 2 of the embodiment, and a sensor resistance in high-purity air for about three months. It shows the transition with the value. One gas detector was used, and the sensor resistance value was corrected for temperature and humidity. Although the sensor resistance value in the embodiment and the sensor resistance value in high-purity air are substantially equal, there is a difference of about 2-3 times in the resistance value between the head space method and the sensor resistance value.

図５は、校正用の容器４や装置６０に１ｐｐｍ濃度のトルエンを５ｃｃ注入した前後での、センサ抵抗の変化を示している。縦軸はトルエン注入前の抵抗値R0と注入後の抵抗値Rsとの比である。センサ抵抗はトルエンに感応して低下し、図の細線のように浄化手段を設けない場合はそのまま回復しない。実施例ではトルエンの注入から約２分でセンサ抵抗は元の値に復帰する。ヘッドスペース法では復帰までに約４分必要である。このことは、センサプローブ１２に付着した、あるいは容器４にプローブ１２を挿入する際に持ち込まれた周囲のガスや揮発性成分により、容器４の内側スペース１０内の空気が浄化されるまで、０点校正前に待機する必要があることを意味する。そして実施例ではヘッドスペース法に比べ約１／２の待機時間で０点校正を行える。   FIG. 5 shows changes in sensor resistance before and after 5 cc of 1 ppm concentration of toluene is injected into the calibration container 4 or the apparatus 60. The vertical axis represents the ratio between the resistance value R0 before toluene injection and the resistance value Rs after injection. The sensor resistance decreases in response to toluene, and does not recover as it is when no purifying means is provided as shown by the thin line in the figure. In the embodiment, the sensor resistance returns to the original value after about 2 minutes from the injection of toluene. The headspace method requires about 4 minutes to return. This is 0 until the air in the inner space 10 of the container 4 is purified by the surrounding gas or volatile components attached to the sensor probe 12 or brought in when the probe 12 is inserted into the container 4. It means that it is necessary to wait before point calibration. In the embodiment, zero-point calibration can be performed with a waiting time of about ½ compared to the headspace method.

実施例では、高純度空気のボンベやヒータ付きの空気浄化触媒を用いずに、正確かつ簡単にガス検出装置の０点を校正できる。またセンサプローブ１２を挿入した後校正までの、待ち時間を短くできる。なお湿度センサは設けなくても良く、さらにプローブ１２ではなく、ガス検出装置の本体側に設けても良い。
In the embodiment, the zero point of the gas detection device can be calibrated accurately and easily without using a high-purity air cylinder or an air purification catalyst with a heater. Further, the waiting time from the insertion of the sensor probe 12 to the calibration can be shortened. The humidity sensor may not be provided, and may be provided not on the probe 12 but on the main body side of the gas detection device.

実施例での用いた０ガス空気の発生装置の正面図Front view of the 0 gas air generator used in the examples 実施例の携帯用VOC検出装置のブロック図Block diagram of portable VOC detection device of embodiment 高純度空気中のセンサ抵抗値と、実施例の０ガス空気の発生装置中でのセンサ抵抗値との相関を示す図で、比較のためにヘッドスペース法で作成した０ガス中でのセンサ抵抗値の分布を示すIt is a figure which shows the correlation with the sensor resistance value in the high purity air, and the sensor resistance value in the generator of 0 gas air of an Example, The sensor resistance in 0 gas created by the head space method for the comparison Indicates the distribution of values 約３ヶ月の間の、実施例の０ガス空気の発生装置中でのセンサ抵抗値と、高純度空気中でのセンサ抵抗値と、ヘッドスペース法で作成した０ガス中でのセンサ抵抗値の挙動を示す図The sensor resistance value in the generator of 0 gas air of the example, the sensor resistance value in high-purity air, and the sensor resistance value in 0 gas prepared by the headspace method for about 3 months. Diagram showing behavior １ｐｐｍ濃度のトルエンを５ｃｃ０ガス空気の発生装置中に注入した後の、センサ抵抗値の挙動を示す図The figure which shows the behavior of the sensor resistance value after injecting 1ppm concentration toluene into the generator of 5cc0 gas air 従来例のヘッドスペース法での０ガス空気の発生装置の正面図Front view of a zero gas air generator in the conventional headspace method

符号の説明Explanation of symbols

２ ０ガス空気の発生装置
４ 容器
６ 吸着剤
８ 金属製仕切り
１０ 内側スペース
１２ センサプローブ
１４ 通気孔
１６ キャップ
２０ ガスセンサ
２１ 温度センサ
２２ 相対湿度センサ
２４ センサ電源
２６ ＡＤコンバータ
２８ 温湿度補正部
３０ ０点記憶部
３２ VOC検出部
３４ 表示器
３６ データロガー
６０ ０ガス空気の発生装置
６２ 吸着剤
６４ メッシュ
６６ ヘッドスペース 20 Gas Air Generator 4 Container 6 Adsorbent 8 Metal Partition 10 Inner Space 12 Sensor Probe 14 Vent 16 Cap 20 Gas Sensor 21 Temperature Sensor 22 Relative Humidity Sensor 24 Sensor Power Supply 26 AD Converter 28 Temperature / Humidity Compensator 30 Storage unit 32 VOC detection unit 34 Display unit 36 Data logger 60 0 Gas air generator 62 Adsorbent 64 Mesh 66 Head space

Claims (3)

容器内にガスの吸着剤を収容して、ガス検出装置のガスセンサを挿入し、その０点を校正するための０ガス空気の発生装置において、
前記容器内に通気性を備えた筒状の仕切り部材を設けて、その外側のスペースに吸着剤を収容することにより、仕切り部材の内側の空気を外側の吸着剤で浄化すると共に、仕切り部材の内側のスペースにガスセンサを挿入自在にしたことを特徴とする、ガス検出装置用の０ガス空気の発生装置。 In a 0 gas air generator for containing a gas adsorbent in a container, inserting a gas sensor of a gas detector, and calibrating the zero point thereof,
By providing a cylindrical partition member with air permeability in the container and storing the adsorbent in the outer space, the air inside the partition member is purified with the outer adsorbent, and the partition member A zero gas air generator for a gas detector, characterized in that a gas sensor can be freely inserted into an inner space. ヒータを備えたガスセンサを校正するために、前記仕切り部材が多数の穴を備えた金属により構成されていることを特徴とする、請求項１のガス検出装置用の０ガス空気の発生装置。 2. The zero gas air generator for a gas detector according to claim 1, wherein the partition member is made of a metal having a large number of holes in order to calibrate a gas sensor having a heater. 前記ガスセンサが金属酸化物半導体ガスセンサで、少なくともガスセンサと湿度センサとを備えたセンサプローブを、前記内側のスペースに挿入するようにしたことを特徴とする、請求項２のガス検出装置用の０ガス空気の発生装置。 The zero gas for a gas detection apparatus according to claim 2, wherein the gas sensor is a metal oxide semiconductor gas sensor, and a sensor probe including at least a gas sensor and a humidity sensor is inserted into the inner space. Air generator.
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