JPH04291141A - Flammable gas detection device and its compensation operation method - Google Patents
Flammable gas detection device and its compensation operation methodInfo
- Publication number
- JPH04291141A JPH04291141A JP8062691A JP8062691A JPH04291141A JP H04291141 A JPH04291141 A JP H04291141A JP 8062691 A JP8062691 A JP 8062691A JP 8062691 A JP8062691 A JP 8062691A JP H04291141 A JPH04291141 A JP H04291141A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- temperature
- flow rate
- measured
- sensor
- 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.)
- Withdrawn
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title 1
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 238000012937 correction Methods 0.000 claims description 31
- 238000004364 calculation method Methods 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 abstract description 19
- 239000000470 constituent Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 105
- 239000000523 sample Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000007084 catalytic combustion reaction Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000011088 calibration curve Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、ボイラ、工業炉や内燃
機関等の燃焼機器の燃焼排ガス中の可燃性ガス濃度の測
定に使用する可燃ガス検出装置およびその補正演算方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustible gas detection device used to measure the concentration of combustible gas in the flue gas of combustion equipment such as boilers, industrial furnaces, and internal combustion engines, and a correction calculation method therefor.
【０００２】0002
【従来の技術】従来から、煙道内の燃焼排ガスを可燃ガ
スセンサに接触させて、煙道内の燃焼排ガス中の各種成
分濃度を測定する可燃ガス検出装置が知られている。こ
の可燃ガス検出装置に用いる可燃ガスセンサは、従来か
ら周囲の温度や測定すべき燃焼排ガスの流速の影響を受
け易いことが知られており、そのため測定ガスである燃
焼排ガスを煙道からサンプリングし、燃焼ガスの温度や
流速の影響を受けない位置に設けた可燃ガスセンサに供
給することにより、ガスセンサの温度および燃焼排ガス
の流速が一定になるようにして可燃ガスの測定を実施し
ていた。2. Description of the Related Art Conventionally, combustible gas detection devices have been known that measure the concentrations of various components in the flue gas by bringing the flue gas in the flue into contact with a combustible gas sensor. It has been known that the combustible gas sensor used in this combustible gas detection device is easily affected by the ambient temperature and the flow rate of the flue gas to be measured. The combustible gas was measured by supplying the combustible gas to a combustible gas sensor installed at a position not affected by the temperature and flow rate of the combustion gas, so that the temperature of the gas sensor and the flow rate of the combustion exhaust gas remained constant.
【０００３】しかしながら、上述したように燃焼排ガス
をサンプリングする構成では、サンプリングガスの流れ
の管理およびメンテナンスが必要となるとともに、サン
プリングによるムダ時間が避けられず、精度の良い測定
を実施できない問題があった。また、これまでにも可燃
ガスセンサをプローブ管の先端に設けその構成を変更し
て可燃ガスセンサを保護することにより温度および流速
を一定にしようとする試みもあったが、測定対象となる
燃焼排ガスは、その燃焼状況によって排ガスの温度及び
流速が大きく変化し、これらの手段をもってしてもガス
センサに達する燃焼排ガスの温度と流速が変化してしま
い、大きな測定誤差の要因となる問題があった。However, the above-mentioned configuration for sampling combustion exhaust gas requires management and maintenance of the flow of the sampling gas, and waste time due to sampling is unavoidable, making it impossible to perform accurate measurements. Ta. In addition, there have been attempts to protect the combustible gas sensor by installing a combustible gas sensor at the tip of the probe tube and changing its configuration to keep the temperature and flow rate constant, but the combustion exhaust gas to be measured is The temperature and flow velocity of the exhaust gas change greatly depending on the combustion conditions, and even with these means, the temperature and flow velocity of the combustion exhaust gas that reaches the gas sensor change, causing a problem of large measurement errors.
【０００４】0004
【発明が解決しようとする課題】そのため、近年になっ
て、図７に示すようにプローブ１１の先端に設けた保護
管１２および保護フィルタ１３の内部の可燃ガスセンサ
１４の近傍またはセンサ素子内にヒータ１５とともに測
温素子１６を設置し、燃焼排ガスの温度変化を検知する
ことにより温度の補正演算を実施して測定誤差をなくそ
うとする試みが行われているが、可燃ガスセンサにおい
ては、その構造上プローブ内のガスセンサ近傍の温度を
正確に測定することが困難であるとともに、同一ガス温
度であっても測定すべき燃焼排ガスの流速が変動すると
ガスセンサ内の活性部に到達するガス分子数が変動し、
やはり大きな誤差を生じる問題があった。[Problems to be Solved by the Invention] Therefore, in recent years, as shown in FIG. Attempts have been made to eliminate measurement errors by installing a temperature measuring element 16 in conjunction with the combustible gas sensor and detecting temperature changes in the combustion exhaust gas to perform temperature correction calculations. It is difficult to accurately measure the temperature near the gas sensor in the upper probe, and even if the gas temperature is the same, if the flow rate of the combustion exhaust gas to be measured changes, the number of gas molecules that reach the active part in the gas sensor will change. death,
As expected, there was a problem that caused a large error.
【０００５】本発明の目的は上述した課題を解消して、
測定すべき燃焼排ガスの温度及び流速が変化しても精度
良く燃焼排ガス中の各成分濃度を測定することのできる
可燃ガス検出装置およびその補正演算方法を提供しよう
とするものである。[0005] The purpose of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a combustible gas detection device and a correction calculation method thereof that can accurately measure the concentration of each component in the combustion exhaust gas even if the temperature and flow velocity of the combustion exhaust gas to be measured change.
【０００６】[0006]
【課題を解決するための手段】本発明の可燃ガス検出装
置は、可燃ガスセンサを使用した可燃ガス検出装置にお
いて、ガスセンサ近傍に測定ガスの温度を検出する温度
検出手段を設け、測定した温度からガスセンサの温度補
正を実施するとともに、ガスセンサの近傍に測定ガスの
流速を検出する流速測定手段を設け、測定した流速から
ガスセンサの流速補正を実施するよう構成したことを特
徴とするものである。[Means for Solving the Problems] The combustible gas detection device of the present invention is a combustible gas detection device using a combustible gas sensor, in which a temperature detection means for detecting the temperature of the gas to be measured is provided near the gas sensor, and the measured temperature is detected by the gas sensor. The present invention is characterized in that a flow velocity measuring means for detecting the flow velocity of the gas to be measured is provided near the gas sensor, and the flow velocity correction of the gas sensor is carried out based on the measured flow velocity.
【０００７】また、本発明の可燃ガス検出装置の補正演
算方法は、可燃ガスセンサを使用した可燃ガス検出装置
の補正演算方法において、ガスセンサ近傍の測定ガスの
温度および流速を測定し、測定した温度および流速に基
づきガスセンサの温度補正および流速補正を実施するこ
とを特徴とするものである。Further, in the correction calculation method for a combustible gas detection device according to the present invention, in the correction calculation method for a combustible gas detection device using a combustible gas sensor, the temperature and flow velocity of the measurement gas near the gas sensor are measured, and the measured temperature and The present invention is characterized by performing temperature correction and flow rate correction of the gas sensor based on the flow rate.
【０００８】[0008]
【作用】上述した構成において、本発明の可燃ガス検出
装置では、ガスセンサ近傍の温度とともに流速をも測定
することができるよう、ガスセンサ近傍に温度測定手段
および流速測定手段を設けたため、温度の演算補正だけ
でなくさらに流速の補正演算を可能とし、温度の補正演
算だけでは不可能であった高精度の測定を可能としてい
る。本発明において、温度測定手段および流速測定手段
をガスセンサの近傍に配置したのは、センサ近傍の測定
に使用する実際の燃焼排ガスの温度および流速を補正演
算の基礎として使用するためである。[Operation] In the above-described configuration, the combustible gas detection device of the present invention is provided with a temperature measuring means and a flow velocity measuring means near the gas sensor so as to be able to measure not only the temperature near the gas sensor but also the flow velocity. In addition to this, it also makes it possible to perform correction calculations on flow velocity, making it possible to perform highly accurate measurements that would not have been possible with temperature correction calculations alone. In the present invention, the temperature measuring means and the flow velocity measuring means are arranged near the gas sensor in order to use the actual combustion exhaust gas temperature and flow velocity used for measurement near the sensor as the basis for correction calculations.
【０００９】[0009]
【実施例】図１（ａ）、（ｂ）は本発明の可燃ガス検出
装置の先端部の構成を示す図およびそのＡ−Ａ線に沿っ
た断面図である。本実施例では、図１（ａ）に示すよう
にプローブ管１の先端部には測定すべき燃焼排ガスが通
過する窓１ａを有する保護管２を装着している。図１（
ｂ）に示すように、その内部には支持部３に可燃ガスセ
ンサ４を固定するとともに、この可燃ガスセンサ４の近
傍に測温素子５および流速センサ６を同じく支持部３に
固定することにより設けている。また、これらの可燃ガ
スセンサ４、測温素子５および流速センサ６の周囲には
、燃焼排ガス中の粉塵等からこれらの素子を守るための
保護フィルタ７を保護管２に固定して設けている。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1(a) and 1(b) are diagrams showing the structure of the tip of a combustible gas detection device according to the present invention, and a sectional view thereof taken along the line A--A. In this embodiment, as shown in FIG. 1(a), a protection tube 2 having a window 1a through which the combustion exhaust gas to be measured passes is attached to the tip of the probe tube 1. Figure 1 (
As shown in b), a combustible gas sensor 4 is fixed to the support part 3 in the interior thereof, and a temperature measuring element 5 and a flow rate sensor 6 are also fixed to the support part 3 in the vicinity of the combustible gas sensor 4. There is. Furthermore, a protective filter 7 is fixed to the protective tube 2 around the combustible gas sensor 4, temperature measuring element 5, and flow rate sensor 6 to protect these elements from dust in the combustion exhaust gas.
【００１０】次に、本発明で使用する接触燃焼式センサ
からの出力信号について説明する。まず、接触燃焼式セ
ンサからの出力信号は、一般に以下の式で表される。
Ｅ＝｛（Ｋ・ρ・ａ・Ｑ）／Ｃ｝・ｍ
ここで、Ｋ：信号検出回路による定数、ρ：センサの電
気抵抗の温度係数、ａ：触媒による定数、Ｑ：可燃ガス
の種類による定数、Ｃ：センサの熱容量、ｍ：可燃ガス
濃度（ｖｏｌ％）である。これらの係数の内、ρはセン
サの電気抵抗の温度係数であり、センサの素子温度によ
り定まる係数である。また、ａは触媒による定数であり
、触媒の材質、形状および触媒の温度、ガス流量等によ
って決まる定数である。Next, the output signal from the catalytic combustion sensor used in the present invention will be explained. First, the output signal from the catalytic combustion sensor is generally expressed by the following equation. E={(K・ρ・a・Q)/C}・m Where, K: Constant determined by the signal detection circuit, ρ: Temperature coefficient of electrical resistance of the sensor, a: Constant determined by the catalyst, Q: Type of combustible gas C: heat capacity of the sensor, m: combustible gas concentration (vol%). Among these coefficients, ρ is a temperature coefficient of electrical resistance of the sensor, and is a coefficient determined by the element temperature of the sensor. Further, a is a constant determined by the catalyst, and is determined by the material, shape, temperature of the catalyst, gas flow rate, etc. of the catalyst.
【００１１】そのため、従来のように温度のみを測定し
て制御しようとしても、上述した式中係数ρの制御はで
きても係数ａの制御はできない問題があり、この点を本
発明においては温度測定手段だけでなく流速測定手段を
可燃ガスセンサの近傍に設けて補正演算することにより
、プローブ管の先端に接触燃焼式センサを設けた直入式
可燃ガス検出装置においても、高精度の測定を可能とし
ている。Therefore, even if an attempt is made to measure and control only the temperature as in the past, there is a problem in that it is possible to control the coefficient ρ in the above equation, but it is not possible to control the coefficient a. By installing not only a measuring means but also a flow rate measuring means near the combustible gas sensor and performing correction calculations, it is possible to perform highly accurate measurements even in direct-in combustible gas detection equipment that has a catalytic combustion sensor at the tip of the probe tube. There is.
【００１２】図２は本発明の可燃ガス検出装置における
補正演算の流れを説明するためのブロック図である。図
２に示す例において、可燃ガス検出装置のガスセンサか
ら測定された可燃ガスセンサ出力はまずセンサ間の誤差
をなくすため補正演算され、その後温度測定手段で測定
した温度信号および流速測定手段で測定した流速信号に
基づきさらに補正演算した後、リニアライザを通過させ
、補正演算後のガス濃度を求めている。図２のブロック
中、補正演算に用いるＢＴ 、ＫＴ 、ＢＶ 、ＫＶ
はそれぞれ予め求めた実際のセンサの較正曲線から求め
ている。ここで、ＢＴは測定ガスの温度変化によるセン
サのゼロ点変動を補正する変数、ＫＴは測定ガスの温度
変化によるセンサの可燃ガスに対する感度を補正する変
数、ＢＶは測定ガスの流速変化によるセンサのゼロ点変
動を補正する変数、ＫＶは測定ガスの流速変化によるセ
ンサの可燃ガスに対する感度を補正する変数である。FIG. 2 is a block diagram for explaining the flow of correction calculations in the combustible gas detection device of the present invention. In the example shown in FIG. 2, the combustible gas sensor output measured from the gas sensor of the combustible gas detection device is first corrected to eliminate errors between the sensors, and then the temperature signal measured by the temperature measuring means and the flow velocity measured by the flow rate measuring means are calculated. After performing further correction calculations based on the signal, the gas is passed through a linearizer to determine the gas concentration after the correction calculations. In the blocks of FIG. 2, BT, KT, BV, KV used for correction calculation
are determined from the calibration curves of the actual sensors determined in advance. Here, BT is a variable that corrects the zero point fluctuation of the sensor due to a change in the temperature of the measured gas, KT is a variable that corrects the sensitivity of the sensor to combustible gas due to a change in the temperature of the measured gas, and BV is a variable that corrects the sensor's sensitivity to combustible gas due to a change in the flow rate of the measured gas. The variable KV that corrects the zero point fluctuation is a variable that corrects the sensitivity of the sensor to combustible gas due to the change in flow rate of the measurement gas.
【００１３】実際の補正演算の例として、燃焼排ガス中
のＣＯ濃度の補正演算は以下の式に基づいて行われ、補
正演算値はＦＣＯとして求められる。
ＦＣＯ＝ＫＶ （ｖ） ・｛ＫＴ （ｔ） ・（ｆＣＯ
−ＢＴ （ｔ） ）−ＢＶ （ｖ） ｝
ここで、ｆＣＯ：補正前のＣＯ信号、ｔ：測定ガス温度
、ｖ：測定ガス流速である。実際のＢＴ 、ＫＴ 、Ｂ
Ｖ 、ＫＶ の一例として、それぞれを３次近似した場
合、それらはすべてａｔ３ ＋ｂｔ２ ＋ｃｔ＋ｄもし
くはａｖ３ ＋ｂｖ２ ＋ｃｖ＋ｄで近似され、各係数
は表１のようになる。As an example of an actual correction calculation, the correction calculation of the CO concentration in the combustion exhaust gas is performed based on the following equation, and the correction calculation value is obtained as FCO. FCO=KV (v) ・{KT (t) ・(fCO
-BT(t))-BV(v)} Here, fCO: CO signal before correction, t: Measured gas temperature, v: Measured gas flow rate. Actual BT, KT, B
As an example of V and KV, when each is approximated to the third order, they are all approximated by at3 +bt2 +ct+d or av3 +bv2 +cv+d, and the respective coefficients are as shown in Table 1.
【００１４】[0014]
【表１】[Table 1]
【００１５】温度補正手段と流速補正手段とを有し上述
した補正演算法にしたがって補正した本発明品と、温度
補正手段のみを有し温度補正のみをおこなった従来品と
を準備し、一定のＣＯ濃度の燃焼排ガスであるスパンガ
ス、センターガス、ゼロガスを使用して測定を行った。
ガス流速を１０ｍ／ｓと一定にするとともにガス温度を
３００℃を基準に変化させた場合の従来品および本発明
品の結果を図３および図４にそれぞれ示す。また、ガス
温度を３００℃と一定にするとともにガス流速を１０ｍ
／ｓを基準に変化させた場合の従来品および本発明品の
結果を図５および図６にそれぞれ示す。これらの結果よ
り、本発明品の方が従来品に比べてガス温度またはガス
流速が変化しても測定したガス濃度はほとんど変化せず
、良好な測定結果を得ることができることがわかる。A product of the present invention which has a temperature correction means and a flow velocity correction means and is corrected according to the above-mentioned correction calculation method, and a conventional product which has only a temperature correction means and which only performs temperature correction are prepared. Measurements were performed using span gas, center gas, and zero gas, which are combustion exhaust gases with CO concentrations. The results of the conventional product and the product of the present invention are shown in FIGS. 3 and 4, respectively, when the gas flow rate was kept constant at 10 m/s and the gas temperature was varied from 300°C. In addition, the gas temperature was kept constant at 300°C, and the gas flow rate was set at 10 m.
The results of the conventional product and the product of the present invention when /s is changed as a reference are shown in FIGS. 5 and 6, respectively. From these results, it can be seen that the measured gas concentration hardly changes even when the gas temperature or gas flow rate changes, and better measurement results can be obtained with the product of the present invention than with the conventional product.
【００１６】本発明は上述した実施例にのみ限定される
ものではなく、幾多の変形、変更が可能である。例えば
、上述した実施例では、ＣＯ濃度の測定しか実際の例を
示さなかったが、ほかの成分濃度の測定にも同様に本発
明を適用できることはいうまでもない。また、上述した
係数の値も一実施例の値であって、実際の較正曲線から
その都度求めるため、その都度異なることはいうまでも
ない。The present invention is not limited to the above-described embodiments, but can be modified and modified in many ways. For example, in the embodiments described above, only the measurement of CO concentration was shown as an actual example, but it goes without saying that the present invention can be similarly applied to measurement of other component concentrations. Moreover, the values of the coefficients mentioned above are also values of one example, and since they are determined each time from an actual calibration curve, it goes without saying that they differ each time.
【００１７】[0017]
【発明の効果】上述した実施例から明らかなように、本
発明によれば、プローブ先端に可燃ガスセンサを設けた
可燃ガス検出装置において、温度測定手段の他に流速測
定手段を設け、ガスセンサからの出力を温度および流速
に基づき補正演算を行うよう構成したため、測定ガスで
ある燃焼排ガス等の温度および流速の変動に影響される
ことなく、測定ガス中の可燃ガス成分の濃度を精度良く
測定することができる。As is clear from the embodiments described above, according to the present invention, in a combustible gas detection device having a combustible gas sensor at the tip of the probe, a flow rate measuring means is provided in addition to the temperature measuring means, and Since the output is configured to perform correction calculations based on temperature and flow velocity, it is possible to accurately measure the concentration of combustible gas components in the measurement gas without being affected by fluctuations in the temperature and flow velocity of the measurement gas, such as combustion exhaust gas. Can be done.
【図１】（ａ）は本発明の可燃ガス検出装置の先端部の
構成を示す図、
（ｂ）はそのＡ−Ａ線に沿った断面図である。FIG. 1(a) is a diagram showing the configuration of the tip of a combustible gas detection device of the present invention, and FIG. 1(b) is a sectional view taken along the line A-A.
【図２】本発明の可燃ガス検出装置における補正演算の
流れを説明するためのブロック図である。FIG. 2 is a block diagram for explaining the flow of correction calculations in the combustible gas detection device of the present invention.
【図３】ガス流速を一定にしガス温度を変化させたとき
の従来品の結果を示すグラフである。FIG. 3 is a graph showing the results of a conventional product when the gas flow rate was kept constant and the gas temperature was varied.
【図４】ガス流速を一定にしガス温度を変化させたとき
の本発明品の結果を示すグラフである。FIG. 4 is a graph showing the results of the product of the present invention when the gas flow rate was kept constant and the gas temperature was varied.
【図５】ガス温度を一定にしガス流速を変化させたとき
の従来品の結果を示すグラフである。FIG. 5 is a graph showing the results of the conventional product when the gas temperature was kept constant and the gas flow rate was varied.
【図６】ガス温度を一定にしガス流速を変化させたとき
の本発明品の結果を示すグラフである。FIG. 6 is a graph showing the results of the product of the present invention when the gas temperature was kept constant and the gas flow rate was varied.
【図７】従来の可燃ガス検出装置の先端部の構成を示す
断面図である。FIG. 7 is a cross-sectional view showing the configuration of the tip of a conventional combustible gas detection device.
１ プローブ管 ２ 保護管 ３ 支持部 ４ 可燃ガスセンサ ５ 測温素子 ６ 流速センサ ７ 保護フィルタ 1 Probe tube 2 Protection tube 3 Support part 4 Combustible gas sensor 5 Temperature measuring element 6 Flow velocity sensor 7 Protection filter
Claims (2)
出装置において、ガスセンサ近傍に測定ガスの温度を検
出する温度検出手段を設け、測定した温度からガスセン
サの温度補正を実施するとともに、ガスセンサの近傍に
測定ガスの流速を検出する流速測定手段を設け、測定し
た流速からガスセンサの流速補正を実施するよう構成し
たことを特徴とする可燃ガス検出装置。Claim 1: In a combustible gas detection device using a combustible gas sensor, a temperature detection means for detecting the temperature of the measured gas is provided near the gas sensor, and the temperature of the gas sensor is corrected based on the measured temperature. A combustible gas detection device comprising: a flow rate measuring means for detecting a gas flow rate; and a flow rate correction of a gas sensor based on the measured flow rate.
出装置の補正演算方法において、ガスセンサ近傍の測定
ガスの温度および流速を測定し、測定した温度および流
速に基づきガスセンサの温度補正および流速補正を実施
することを特徴とする可燃ガス検出装置の補正演算方法
。2. In a correction calculation method for a combustible gas detection device using a combustible gas sensor, the temperature and flow velocity of a measurement gas near the gas sensor are measured, and the temperature and flow velocity corrections of the gas sensor are performed based on the measured temperature and flow velocity. A correction calculation method for a combustible gas detection device, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8062691A JPH04291141A (en) | 1991-03-20 | 1991-03-20 | Flammable gas detection device and its compensation operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8062691A JPH04291141A (en) | 1991-03-20 | 1991-03-20 | Flammable gas detection device and its compensation operation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04291141A true JPH04291141A (en) | 1992-10-15 |
Family
ID=13723566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8062691A Withdrawn JPH04291141A (en) | 1991-03-20 | 1991-03-20 | Flammable gas detection device and its compensation operation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04291141A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543113A (en) * | 1992-03-21 | 1996-08-06 | Horiba, Ltd. | Gas analyzing apparatus |
| JP2001264277A (en) * | 2000-03-15 | 2001-09-26 | Kanto Chem Co Inc | Method and device for detecting concentration and chemical diluting dispensing device |
| WO2004046706A1 (en) * | 2002-11-21 | 2004-06-03 | Matsushita Electric Industrial Co., Ltd. | Gas detector |
| JP2005227090A (en) * | 2004-02-12 | 2005-08-25 | Denso Corp | Hydrogen concentration detector and hydrogen concentration detecting method |
| JP2007010594A (en) * | 2005-07-04 | 2007-01-18 | Ngk Spark Plug Co Ltd | Catalytic combustion type gas sensor |
| JP2007114012A (en) * | 2005-10-19 | 2007-05-10 | Riken Keiki Co Ltd | Furnace gas measuring instrument |
| JP2007248458A (en) * | 2006-02-15 | 2007-09-27 | Ngk Spark Plug Co Ltd | Contact combustion-based gas sensor |
| JP2010181282A (en) * | 2009-02-05 | 2010-08-19 | Panasonic Electric Works Co Ltd | Hydrogen detection element |
| JP2012122791A (en) * | 2010-12-07 | 2012-06-28 | Azbil Corp | Humidity detector |
| KR20160053023A (en) * | 2014-10-30 | 2016-05-13 | 에너시스(주) | APPARATUS and METHOD FOR STATUS DETERMINATION OF INSULATION DEGRADATION OF ROTATING MACHINE |
-
1991
- 1991-03-20 JP JP8062691A patent/JPH04291141A/en not_active Withdrawn
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5543113A (en) * | 1992-03-21 | 1996-08-06 | Horiba, Ltd. | Gas analyzing apparatus |
| JP2001264277A (en) * | 2000-03-15 | 2001-09-26 | Kanto Chem Co Inc | Method and device for detecting concentration and chemical diluting dispensing device |
| JP4648513B2 (en) * | 2000-03-15 | 2011-03-09 | 関東化学株式会社 | Concentration detection method, concentration detection device, and drug dilution blending device |
| WO2004046706A1 (en) * | 2002-11-21 | 2004-06-03 | Matsushita Electric Industrial Co., Ltd. | Gas detector |
| US7028530B2 (en) | 2002-11-21 | 2006-04-18 | Matsushita Electric Industrial Co., Ltd. | Gas detector |
| JP2005227090A (en) * | 2004-02-12 | 2005-08-25 | Denso Corp | Hydrogen concentration detector and hydrogen concentration detecting method |
| JP4639117B2 (en) * | 2005-07-04 | 2011-02-23 | 日本特殊陶業株式会社 | Contact combustion type gas sensor |
| JP2007010594A (en) * | 2005-07-04 | 2007-01-18 | Ngk Spark Plug Co Ltd | Catalytic combustion type gas sensor |
| JP2007114012A (en) * | 2005-10-19 | 2007-05-10 | Riken Keiki Co Ltd | Furnace gas measuring instrument |
| JP4731275B2 (en) * | 2005-10-19 | 2011-07-20 | 理研計器株式会社 | In-furnace gas measuring device |
| JP2007248458A (en) * | 2006-02-15 | 2007-09-27 | Ngk Spark Plug Co Ltd | Contact combustion-based gas sensor |
| JP2010181282A (en) * | 2009-02-05 | 2010-08-19 | Panasonic Electric Works Co Ltd | Hydrogen detection element |
| JP2012122791A (en) * | 2010-12-07 | 2012-06-28 | Azbil Corp | Humidity detector |
| KR20160053023A (en) * | 2014-10-30 | 2016-05-13 | 에너시스(주) | APPARATUS and METHOD FOR STATUS DETERMINATION OF INSULATION DEGRADATION OF ROTATING MACHINE |
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