JP2016170020A - Gas detector - Google Patents

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JP2016170020A
JP2016170020A JP2015049517A JP2015049517A JP2016170020A JP 2016170020 A JP2016170020 A JP 2016170020A JP 2015049517 A JP2015049517 A JP 2015049517A JP 2015049517 A JP2015049517 A JP 2015049517A JP 2016170020 A JP2016170020 A JP 2016170020A
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JP6541381B2 (en
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慎士 東
Shinji Azuma
慎士 東
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New Cosmos Electric Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a gas detector with which it is possible to prevent the output value of a continuous drive type sensor from being affected each time an intermittent drive type sensor is intermittently driven.SOLUTION: Provided is a gas detector X comprising at least two or more sensors S including an intermittent drive type sensor 10 and a continuous drive type sensor 20, a reference voltage unit 30 capable of outputting a DC voltage stably, a control unit 40 capable of recognizing the output value of each sensor S and the voltage value of the reference voltage unit 30, and a display unit 50 capable of displaying the output value of each sensor S, the control unit 40 calculating a differential voltage value between the voltage value of the reference voltage unit 30 when electricity to the intermittent drive type sensor 10 is turned on and the voltage value of the reference voltage unit 30 when electricity to the intermittent drive type sensor 10 is not turned on, and further making a correction value in which the differential voltage value is reflected in the output value obtained from the continuous drive type sensor 20 displayed by the display unit 50.SELECTED DRAWING: Figure 1

Description

本発明は、間欠駆動式センサおよび連続駆動式センサの少なくとも二つ以上のセンサを備えたガス検知器に関する。   The present invention relates to a gas detector including at least two sensors of an intermittent drive sensor and a continuous drive sensor.

従来、可燃性ガス漏洩警報やCOガス漏洩警報の機能を有する複合型のガス検知器が知られていた。このガス検知器では、可燃性ガス漏洩警報は例えば接触燃焼式ガスセンサによる出力に基づいており、COガス漏洩警報は例えば定電位電解式ガスセンサによる出力に基づいて行っていた。   Conventionally, a composite gas detector having a function of a flammable gas leak alarm or a CO gas leak alarm has been known. In this gas detector, the combustible gas leak alarm is based on, for example, an output from a contact combustion type gas sensor, and the CO gas leak alarm is based on, for example, an output from a constant potential electrolytic gas sensor.

接触燃焼型ガスセンサは、雰囲気中の酸素と可燃性ガスとの酸化反応による発熱をヒータの抵抗変化として可燃性ガスの濃度を検出する。通常、現場での使用の便を考慮して駆動電力を電池とするため、検出部のヒータにおける消費電力を節減するべく間欠駆動式とする場合があった。   The contact combustion type gas sensor detects the concentration of the combustible gas by using the heat generated by the oxidation reaction between oxygen in the atmosphere and the combustible gas as a resistance change of the heater. Usually, since driving power is made into a battery in consideration of convenience of use in the field, there is a case where an intermittent driving type is used in order to save power consumption in the heater of the detection unit.

定電位電解式ガスセンサは、周囲の環境変化に対して反応極の電位を制御して一定に維持することによって、反応極と対極との間に周囲の環境変化に相当する電流を生じさせる。そのため、通常、定電位電解式ガスセンサの駆動方式は連続駆動式としていた。この場合、ベースを浮かすことでマイナス方向のセンサ出力にも対応できるように、直流電圧を安定して出力できる基準電圧ICを定電位電解式ガスセンサに接続して反応極の電位を制御して一定に維持していた。   The constant potential electrolytic gas sensor generates a current corresponding to the change in the surrounding environment between the reaction electrode and the counter electrode by controlling the potential of the reaction electrode to be constant with respect to the change in the surrounding environment. Therefore, the driving system of the constant potential electrolysis gas sensor is usually a continuous driving system. In this case, a reference voltage IC that can stably output a DC voltage is connected to a constant potential electrolytic gas sensor to control the potential of the reaction electrode so that the sensor output in the negative direction can be supported by floating the base. Was maintained.

尚、本発明における従来技術となる上述したガス検知器は、一般的な技術であるため、特許文献等の従来技術文献は示さない。   In addition, since the above-mentioned gas detector used as the prior art in this invention is a general technique, prior art documents, such as a patent document, are not shown.

このようなガス検知器において、マイコン等のガス検知動作に係る機能部材をメイン基板に搭載し、上述した複数のセンサをセンサ基板に搭載し、これら基板どうしをリード線やフレキシブルケーブルによってコネクタを介して電気的に接続する場合があった。   In such a gas detector, a functional member related to a gas detection operation such as a microcomputer is mounted on a main board, the above-described plurality of sensors are mounted on a sensor board, and these boards are connected to each other through a connector using lead wires or flexible cables. Sometimes connected electrically.

この場合、間欠駆動式の接触燃焼型ガスセンサに対して間歇的に電流を流したときには、リード線、フレキシブルケーブルやコネクタ等の接触部分において接触抵抗が発生し、その影響でメイン基板のグランド電位およびセンサ基板のグランド電位に電位差が生じる虞があった。   In this case, when an intermittent current is applied to the intermittently driven catalytic combustion type gas sensor, contact resistance is generated at the contact portion of the lead wire, flexible cable, connector, etc., and the influence causes the ground potential of the main board and There may be a potential difference in the ground potential of the sensor substrate.

このような電位差が生じると、接触燃焼型ガスセンサに対して間歇的に電流を流す度に、接触燃焼型ガスセンサと同じセンサ基板に搭載してある連続駆動式の定電位電解式ガスセンサの見かけ上の出力値に影響を及ぼす虞があった。尚、このような影響は、センサ基板上に搭載した基準電圧ICの出力にも生じている。   When such a potential difference occurs, every time an electric current is intermittently applied to the catalytic combustion type gas sensor, the continuous drive type constant potential electrolytic gas sensor mounted on the same sensor substrate as the catalytic combustion type gas sensor is apparent. There was a risk of affecting the output value. Such an effect also occurs in the output of the reference voltage IC mounted on the sensor substrate.

従って、本発明の目的は、間欠駆動式センサの間欠駆動の度に、連続駆動式センサの出力値に影響を及ぼすのを未然に防止できるガス検知器を提供することにある。   Accordingly, an object of the present invention is to provide a gas detector that can prevent the output value of a continuous drive sensor from being affected each time the intermittent drive sensor is intermittently driven.

上記目的を達成するための本発明に係るガス検知器の第一特徴構成は、間欠駆動式センサおよび連続駆動式センサの少なくとも二つ以上のセンサと、直流電圧を安定して出力できる基準電圧部と、各センサの出力値および前記基準電圧部の電圧値を認識できる制御部と、各センサの出力値を表示できる表示部と、を備え、前記制御部は、前記間欠駆動式センサを通電したときの前記基準電圧部の電圧値、および、前記間欠駆動式センサに通電しないときの前記基準電圧部の電圧値の差分電圧値を算出し、さらに前記連続駆動式センサから得た出力値に前記差分電圧値を反映させた補正値を前記表示部に表示させるように制御する点にある。   In order to achieve the above object, the first characteristic configuration of the gas detector according to the present invention includes at least two sensors, an intermittent drive sensor and a continuous drive sensor, and a reference voltage unit capable of stably outputting a DC voltage. And a control unit capable of recognizing the output value of each sensor and the voltage value of the reference voltage unit, and a display unit capable of displaying the output value of each sensor, wherein the control unit energizes the intermittent drive sensor. When the voltage value of the reference voltage unit and the voltage value of the reference voltage unit when the intermittent drive sensor is not energized are calculated, the output value obtained from the continuous drive sensor The point of control is to display a correction value reflecting the differential voltage value on the display unit.

本構成によれば、制御部によって、上述した接触抵抗の影響で生じた電位差である差分電圧値を加える或いは差引して調節した補正値を演算し、当該補正値を表示部によって表示できる。これにより、センサ出力の変動を見かけ上無くして、接触抵抗の影響を排除した値を表示部に表示することができる。そのため、本発明のガス検知器であれば、間欠駆動式センサの間欠駆動の度に、連続駆動式センサの出力値に影響を及ぼすのを未然に防止できる。   According to this configuration, the control unit can calculate the correction value adjusted by adding or subtracting the differential voltage value that is the potential difference caused by the influence of the contact resistance described above, and the correction value can be displayed on the display unit. As a result, it is possible to display on the display unit a value from which the influence of the contact resistance is eliminated without apparently changing the sensor output. Therefore, the gas detector of the present invention can prevent the output value of the continuous drive sensor from being affected every time the intermittent drive sensor is intermittently driven.

本発明に係るガス検知器の第二特徴構成は、前記制御部は、前記間欠駆動式センサを通電したときに前記補正値を前記表示部に表示させ、前記間欠駆動式センサに通電しないときに前記連続駆動式センサから得た出力値を前記表示部に表示させる点にある。   The second characteristic configuration of the gas detector according to the present invention is that the control unit displays the correction value on the display unit when the intermittent drive sensor is energized and does not energize the intermittent drive sensor. The output value obtained from the continuous drive sensor is displayed on the display unit.

本構成によれば、補正値と連続駆動式センサから得た出力値とを、間欠駆動式センサの通電の有無によって切り替えて表示することができる。これにより、常に間欠駆動式センサの間欠駆動の影響を受け難い値を表示できるガス検知器とすることができる。   According to this configuration, the correction value and the output value obtained from the continuous drive sensor can be switched and displayed depending on whether or not the intermittent drive sensor is energized. Thereby, it can be set as the gas detector which can always display the value which is hard to receive the influence of the intermittent drive of an intermittent drive type sensor.

本発明に係るガス検知器の第三特徴構成は、前記間欠駆動式センサを接触燃焼式ガスセンサとし、前記連続駆動式センサを定電位電解式ガスセンサとした点にある。   A third characteristic configuration of the gas detector according to the present invention is that the intermittent drive sensor is a contact combustion gas sensor, and the continuous drive sensor is a constant potential electrolytic gas sensor.

本構成によれば、接触燃焼式ガスセンサによってメタン、イソブタン等の可燃性ガスの濃度を測定することができ、定電位電解式ガスセンサによって一酸化炭素や硫化水素など毒性ガスを測定することができるため、複合型のガス検知器とすることができる。   According to this configuration, the concentration of combustible gases such as methane and isobutane can be measured by a catalytic combustion gas sensor, and toxic gases such as carbon monoxide and hydrogen sulfide can be measured by a constant potential electrolytic gas sensor. It can be a composite gas detector.

本発明のガス検知器の概要を示す図である。It is a figure which shows the outline | summary of the gas detector of this invention. 接触燃焼型ガスセンサ(間欠駆動式)オン時の電圧レベルを示した図である。It is the figure which showed the voltage level at the time of ON of a contact combustion type gas sensor (intermittent drive type).

以下、本発明の実施形態を図面に基づいて説明する。
図1に示したように本発明のガス検知器Xは、間欠駆動式センサ10および連続駆動式センサ20の少なくとも二つ以上のセンサSと、直流電圧を安定して出力できる基準電圧部30と、各センサSの出力値および基準電圧部30の電圧値を認識できる制御部40と、各センサSの出力値を表示できる表示部50と、を備える。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the gas detector X of the present invention includes at least two sensors S, ie, an intermittent drive sensor 10 and a continuous drive sensor 20, and a reference voltage unit 30 that can stably output a DC voltage. The control part 40 which can recognize the output value of each sensor S and the voltage value of the reference voltage part 30, and the display part 50 which can display the output value of each sensor S are provided.

本実施形態では、上述した各部材を、メイン基板B1およびセンサ基板B2の何れかに搭載した場合について説明する。このように複数の基板に各部材を分散して搭載することで、ガス検知器Xの内部の設計の自由度が増す。これら基板B1,B2は何れも平板状の基板とすることができ、リード線、フラットケーブルおよびフレキシブルケーブル等のケーブルC1によってコネクタC2を介して電気的に接続してある。ケーブルC1は複数設けることができる。本実施形態では二本のケーブルC1を設けた場合について説明する。   In the present embodiment, a case will be described in which each member described above is mounted on either the main board B1 or the sensor board B2. In this way, by distributing and mounting each member on a plurality of substrates, the degree of freedom in designing the gas detector X is increased. Both of these substrates B1 and B2 can be flat substrates, and are electrically connected via a connector C2 by a cable C1 such as a lead wire, a flat cable, and a flexible cable. A plurality of cables C1 can be provided. In this embodiment, a case where two cables C1 are provided will be described.

メイン基板B1は、例えばガス検知動作に係る機能部材(制御部40,表示部50)を搭載するのがよい。表示部50は、各センサSの出力値を表示できる態様であれば、デジタル式やアナログ式等の表示手段を使用することができる。また、センサ基板B2は、各センサS(間欠駆動式センサ10,連続駆動式センサ20)や基準電圧部30を搭載するのがよい。   The main board B1 is preferably mounted with functional members (control unit 40, display unit 50) related to the gas detection operation, for example. As long as the display unit 50 can display the output value of each sensor S, a display unit such as a digital type or an analog type can be used. The sensor substrate B2 is preferably mounted with each sensor S (intermittent drive sensor 10, continuous drive sensor 20) and reference voltage unit 30.

本実施形態では、間欠駆動式センサを接触燃焼式ガスセンサとし、連続駆動式センサを定電位電解式ガスセンサとした場合について説明するが、これらに限定されるものではない。   In the present embodiment, a case where the intermittent drive type sensor is a contact combustion type gas sensor and the continuous drive type sensor is a constant potential electrolytic gas sensor will be described, but the present invention is not limited thereto.

接触燃焼式ガスセンサに備えられている接触燃焼式ガス検知素子は、アルミナ等の金属酸化物焼結体に白金等の貴金属触媒を担持したガス感応部としての燃焼触媒部を、白金等の貴金属線に設けてあり、燃焼触媒部において検知対象となる可燃性ガスを貴金属触媒と接触・燃焼させることで、燃焼の際に生じる温度変化を貴金属線の抵抗値の変化として検出する。可燃性ガスの燃焼熱は可燃性ガスの濃度に比例し、LELまでほぼ直線であり、貴金属線の抵抗値は燃焼熱に比例するため、可燃性ガスの燃焼による貴金属線の抵抗の変化値を測定することによってメタン、イソブタン等の可燃性ガスの濃度を測定することができる。   The catalytic combustion type gas detection element provided in the catalytic combustion type gas sensor comprises a noble metal wire such as platinum as a combustion catalyst part as a gas sensitive part in which a noble metal catalyst such as platinum is supported on a sintered metal oxide such as alumina. The temperature change that occurs during combustion is detected as a change in the resistance value of the noble metal wire by contacting and burning the combustible gas to be detected in the combustion catalyst section with the noble metal catalyst. The combustion heat of the combustible gas is proportional to the concentration of the combustible gas and is almost linear up to LEL, and the resistance value of the noble metal wire is proportional to the combustion heat, so the change value of the resistance of the noble metal wire due to the combustion of the combustible gas is By measuring, the concentration of combustible gas such as methane and isobutane can be measured.

接触燃焼型ガスセンサは、雰囲気中の酸素と可燃性ガスとの酸化反応による発熱をヒータの抵抗変化として可燃性ガスの濃度を検出する。通常、現場での使用の便を考慮して駆動電力を電池とするため、検出部のヒータでの消費電力を節減するべく間欠駆動式、例えば8秒の周期で2秒間通電することが行われている。   The contact combustion type gas sensor detects the concentration of the combustible gas by using the heat generated by the oxidation reaction between oxygen in the atmosphere and the combustible gas as a resistance change of the heater. Usually, in order to save the power consumed by the heater of the detection unit in order to save the power consumed by the battery in consideration of the convenience of use in the field, the energization is performed for 2 seconds with a period of 8 seconds, for example. ing.

定電位電解式ガスセンサは、電極を電解液が密に収容される電解槽の電解液収容部内に臨んで設けて構成してあり、例えば電極としては、ガスを検知するガス電極として被検知ガスを電気化学反応させる反応極、当該反応極に対する対極、反応極の電位を制御する参照極の3電極を設けてあり、また、これらが接触自在な電解液を収容した電解槽と、各電極の電位を設定するポテンシオスタット回路等を接続してある。   The constant potential electrolytic gas sensor is configured such that an electrode is provided facing an electrolytic solution storage part of an electrolytic cell in which the electrolytic solution is densely stored. For example, an electrode includes a gas to be detected as a gas electrode for detecting gas. There are provided three electrodes: a reaction electrode for electrochemical reaction, a counter electrode for the reaction electrode, and a reference electrode for controlling the potential of the reaction electrode. A potentiostat circuit or the like for setting is connected.

定電位電解式ガスセンサは、周囲の環境変化に対して反応極の電位を制御して一定に維持することによって、反応極と対極との間に周囲の環境変化に相当する電流を生じさせる。そのため、通常、定電位電解式ガスセンサの駆動方式は連続駆動式としている。この場合、直流電圧を安定して出力できる基準電圧部30を定電位電解式ガスセンサに接続して反応極の電位を制御して一定に維持している。そして、反応極の電位が変化せず、またガス種によって酸化還元電位が異なることを利用することにより、ポテンシオスタット回路の設定電位によってはガスの選択的な検知が可能になる。   The constant potential electrolytic gas sensor generates a current corresponding to the change in the surrounding environment between the reaction electrode and the counter electrode by controlling the potential of the reaction electrode to be constant with respect to the change in the surrounding environment. Therefore, the driving method of the constant potential electrolytic gas sensor is usually a continuous driving method. In this case, a reference voltage unit 30 that can stably output a DC voltage is connected to a constant potential electrolysis gas sensor, and the potential of the reaction electrode is controlled and maintained constant. Then, by utilizing the fact that the potential of the reaction electrode does not change and the oxidation-reduction potential varies depending on the gas type, it becomes possible to selectively detect the gas depending on the set potential of the potentiostat circuit.

定電位電解式ガスセンサは非常に高感度なセンサで、ガスの選択性に優れており、一酸化炭素や硫化水素など毒性ガスを測定することができる。   The potentiostatic gas sensor is a very sensitive sensor, has excellent gas selectivity, and can measure toxic gases such as carbon monoxide and hydrogen sulfide.

本発明のガス検知器Xは、間欠駆動式センサ10および連続駆動式センサ20の少なくとも二つ以上のセンサSを備えることが可能であるため、上述したセンサSの他、さらに隔膜ガルバニ電池式センサ等のセンサSを搭載してもよい。隔膜ガルバニ電池式センサは、2つの電極(貴金属、卑金属)と隔膜、電解液で構成された電池の反応物質として酸素を利用した時に生ずる反応電流を測定するものであり、酸素ガス等を検知することができる。   Since the gas detector X of the present invention can include at least two sensors S of the intermittent drive type sensor 10 and the continuous drive type sensor 20, in addition to the sensor S described above, a diaphragm galvanic cell type sensor is also provided. A sensor S such as the above may be mounted. The diaphragm galvanic cell type sensor measures the reaction current generated when oxygen is used as the reactant of the battery composed of two electrodes (noble metal, base metal), diaphragm and electrolyte, and detects oxygen gas etc. be able to.

基準電圧部30は、直流電圧を安定して出力できる基準電圧ICを使用することができる。このような基準電圧ICとしてツェナーダイオードを用いることが可能であるが、この代わりに他の原理(例えばバンドキャップリファレンス等)による基準電圧ICを用いることもできる。また、ガス検知器Xの電源部(図外)は電池を用いるとよいが、これに限られるものではない。電池を用いることによって、ガス検知器Xを小型化することができる。   The reference voltage unit 30 can use a reference voltage IC that can stably output a DC voltage. Although a Zener diode can be used as such a reference voltage IC, a reference voltage IC based on another principle (for example, a band cap reference or the like) can be used instead. Moreover, although the battery is good for a power supply part (not shown) of the gas detector X, it is not restricted to this. By using a battery, the gas detector X can be reduced in size.

制御部40は、各センサSの出力値および基準電圧部30の電圧値を認識できる態様であれば特に限定されるものではなく、例えば後述する演算手段や記憶手段を備えたマイコン等を使用することができる。   The control unit 40 is not particularly limited as long as it can recognize the output value of each sensor S and the voltage value of the reference voltage unit 30. be able to.

制御部40は、間欠駆動式センサ10を通電したときの基準電圧部30の電圧値、および、間欠駆動式センサ10に通電しないときの基準電圧部30の電圧値の差分電圧値を算出し、さらに連続駆動式センサ20から得た出力値に差分電圧値を反映させた補正値Rを表示部50に表示させるように制御する(図2)。   The control unit 40 calculates a differential voltage value between the voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is energized and the voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is not energized, Further, the display unit 50 is controlled to display the correction value R in which the differential voltage value is reflected in the output value obtained from the continuous drive sensor 20 (FIG. 2).

制御部40は、差分電圧値を演算する演算手段を備えるとよい。また、当該演算手段では、各センサSが検知した出力に基づき、被検知ガスの濃度を換算することができる。当該演算手段は、上記の演算や換算ができる公知の手段を使用すればよい。表示部50は、演算手段で算出した結果を、各センサSから得た出力値として表示することができる。さらに表示部50は、このような出力値に差分電圧値を反映させた補正値Rを表示することができる。   The control unit 40 may include calculation means for calculating the differential voltage value. In addition, the calculation means can convert the concentration of the gas to be detected based on the output detected by each sensor S. The calculation means may be a known means capable of the above calculation and conversion. The display unit 50 can display the result calculated by the calculation means as an output value obtained from each sensor S. Further, the display unit 50 can display the correction value R in which the differential voltage value is reflected in such an output value.

間欠駆動式センサ10を通電したときの基準電圧部30の電圧値、および、間欠駆動式センサ10に通電しないときの基準電圧部30の電圧値は、それぞれ制御部40に備えた記憶手段に記憶しておけばよい。差分電圧値を求める場合は、このように記憶したそれぞれの電圧値を呼び出して演算手段により演算する。記憶手段は、複数種類の電圧値(電圧信号)を記憶できるメモリやストレージであれば、どのような態様でもよい。   The voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is energized and the voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is not energized are stored in the storage means provided in the control unit 40, respectively. You just have to. When the differential voltage value is obtained, each voltage value stored in this way is called and calculated by the calculation means. The storage means may be in any form as long as it is a memory or storage capable of storing a plurality of types of voltage values (voltage signals).

また、制御部40における演算手段が警報レベル以上の被検知ガス濃度を継続して検知した場合、警報信号を警報手段(図外)に送って当該警報手段により警報を発するように制御することができる。警報手段では、選択された警報音信号に基づいて音声により警報を発する。警報手段はスピーカおよびその駆動回路で構成され、警報音信号を警報音に変換して出力する。   Further, when the calculation means in the control unit 40 continuously detects the detected gas concentration equal to or higher than the alarm level, it is possible to control the alarm means to send an alarm signal to the alarm means (not shown) and issue an alarm by the alarm means. it can. The alarm means issues an alarm by voice based on the selected alarm sound signal. The alarm means comprises a speaker and its drive circuit, converts an alarm sound signal into an alarm sound and outputs it.

上述した差分電圧値を反映させた補正値Rは、制御部40における演算手段によって連続駆動式センサ20から得た出力値に、当該差分電圧値を加える或いは差引して演算することができる。   The correction value R reflecting the above-described differential voltage value can be calculated by adding or subtracting the differential voltage value to the output value obtained from the continuous drive sensor 20 by the calculation means in the control unit 40.

間欠駆動式の接触燃焼型ガスセンサに対して間歇的に電流を流したときには、ケーブルC1やコネクタC2の接触部分において接触抵抗が発生し、その影響でメイン基板B1のグランド電位MGおよびセンサ基板B2のグランド電位SGに電位差PDが生じる虞があった(図2)。このような電位差PDが生じると、接触燃焼型ガスセンサに対して間歇的に電流を流す度に、接触燃焼型ガスセンサと同じセンサ基板B2に搭載してある連続駆動式の定電位電解式ガスセンサの見かけ上の出力値(表示部50の表示値)が変動することがあった。このとき、基準電圧部30の出力の変動は、メイン基板B1のグランド電位MGおよびセンサ基板B2のグランド電位SGの電位差PDと同じ電位となる。   When an intermittent current is supplied to the intermittently driven contact combustion type gas sensor, contact resistance is generated at the contact portion of the cable C1 and the connector C2, and as a result, the ground potential MG of the main substrate B1 and the sensor substrate B2 There is a concern that a potential difference PD may occur in the ground potential SG (FIG. 2). When such a potential difference PD occurs, every time a current is intermittently supplied to the catalytic combustion type gas sensor, the appearance of the continuously driven constant potential electrolytic gas sensor mounted on the same sensor substrate B2 as the catalytic combustion type gas sensor is apparent. The upper output value (display value of the display unit 50) sometimes fluctuated. At this time, the output fluctuation of the reference voltage unit 30 becomes the same potential as the potential difference PD between the ground potential MG of the main substrate B1 and the ground potential SG of the sensor substrate B2.

本発明では、制御部40は、間欠駆動式センサ10を通電したときの基準電圧部30の電圧値、および、間欠駆動式センサ10に通電しないときの基準電圧部30の電圧値の差分電圧値を算出する。この差分電圧値は、上記電位差PDと同じ電位である。よって、このように差分電圧値を算出し、連続駆動式センサ20から得た出力値に差分電圧値を反映させた補正値Rを表示部50に表示させるように制御部40が制御すれば、上述した接触抵抗の影響で生じた電位差PDである差分電圧値を加える或いは差引して調節した補正値Rを表示できる。これにより、センサ出力の変動を見かけ上無くして、接触抵抗の影響を排除した値を表示部50に表示することができる。そのため、本発明のガス検知器Xであれば、間欠駆動式センサ10の間欠駆動の度に、連続駆動式センサ20の出力値に影響を及ぼすのを未然に防止できる。   In the present invention, the control unit 40 is a differential voltage value between the voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is energized and the voltage value of the reference voltage unit 30 when the intermittent drive sensor 10 is not energized. Is calculated. This differential voltage value is the same potential as the potential difference PD. Therefore, if the control unit 40 controls the display unit 50 to display the correction value R in which the differential voltage value is reflected in the output value obtained from the continuous drive sensor 20 in this way, the differential voltage value is calculated. The correction value R adjusted by adding or subtracting the differential voltage value which is the potential difference PD generated by the influence of the contact resistance described above can be displayed. As a result, it is possible to display on the display unit 50 a value from which the influence of the contact resistance is eliminated without apparently changing the sensor output. Therefore, the gas detector X of the present invention can prevent the output value of the continuous drive sensor 20 from being affected every time the intermittent drive sensor 10 is intermittently driven.

具体的には、上述した接触抵抗の影響でメイン基板B1のグランド電位MGがセンサ基板B2のグランド電位SGの方より高くなった場合(図2)、連続駆動式センサ20から得た出力値に差分電圧値PDを差引きした値を補正値Rとする。或いは、接触抵抗の影響でメイン基板B1のグランド電位がセンサ基板B2のグランド電位の方より低くなった場合、連続駆動式センサ20から得た出力値に差分電圧値PDを加えた値を補正値Rとする。   Specifically, when the ground potential MG of the main substrate B1 becomes higher than the ground potential SG of the sensor substrate B2 due to the influence of the contact resistance described above (FIG. 2), the output value obtained from the continuous drive sensor 20 is obtained. A value obtained by subtracting the differential voltage value PD is defined as a correction value R. Alternatively, when the ground potential of the main substrate B1 becomes lower than the ground potential of the sensor substrate B2 due to the influence of contact resistance, a value obtained by adding the differential voltage value PD to the output value obtained from the continuous drive sensor 20 is a correction value. Let R be.

制御部40は、間欠駆動式センサ10を通電したときに補正値Rを表示部50に表示させ、間欠駆動式センサ10に通電しないときに連続駆動式センサ20から得た出力値を表示部50に表示させるように制御することができる。   The control unit 40 displays the correction value R on the display unit 50 when the intermittent drive sensor 10 is energized, and displays the output value obtained from the continuous drive sensor 20 when the intermittent drive sensor 10 is not energized. Can be controlled to be displayed.

このように制御することにより、間欠駆動式センサ10を通電したときに補正値Rを表示して接触抵抗の影響を排除した値を表示し、間欠駆動式センサ10に通電しないときに連続駆動式センサ20から得た出力値に切り替えて表示することができる。これにより、常に間欠駆動式センサ10の間欠駆動の影響を受け難い値を表示できるガス検知器Xとすることができる。   By controlling in this way, the correction value R is displayed when the intermittent drive sensor 10 is energized, the value excluding the influence of the contact resistance is displayed, and the continuous drive type when the intermittent drive sensor 10 is not energized. The output value obtained from the sensor 20 can be switched and displayed. Thereby, it can be set as the gas detector X which can always display the value which is hard to receive the influence of the intermittent drive of the intermittent drive sensor 10. FIG.

本発明は、間欠駆動式センサおよび連続駆動式センサの少なくとも二つ以上のセンサを備えたガス検知器に利用できる。   The present invention can be used for a gas detector provided with at least two sensors of an intermittent drive sensor and a continuous drive sensor.

X ガス検知器
S センサ
10 間欠駆動式センサ
20 連続駆動式センサ
30 基準電圧部
40 制御部
50 表示部
X Gas detector S Sensor 10 Intermittent drive sensor 20 Continuous drive sensor 30 Reference voltage unit 40 Control unit 50 Display unit

Claims (3)

間欠駆動式センサおよび連続駆動式センサの少なくとも二つ以上のセンサと、直流電圧を安定して出力できる基準電圧部と、各センサの出力値および前記基準電圧部の電圧値を認識できる制御部と、各センサの出力値を表示できる表示部と、を備え、
前記制御部は、前記間欠駆動式センサを通電したときの前記基準電圧部の電圧値、および、前記間欠駆動式センサに通電しないときの前記基準電圧部の電圧値の差分電圧値を算出し、さらに前記連続駆動式センサから得た出力値に前記差分電圧値を反映させた補正値を前記表示部に表示させるように制御するガス検知器。
At least two sensors of an intermittent drive type sensor and a continuous drive type sensor, a reference voltage unit capable of stably outputting a DC voltage, and a control unit capable of recognizing an output value of each sensor and a voltage value of the reference voltage unit; A display unit that can display the output value of each sensor,
The control unit calculates a voltage value of the reference voltage unit when the intermittent drive sensor is energized, and a differential voltage value of the voltage value of the reference voltage unit when the intermittent drive sensor is not energized, Furthermore, the gas detector which controls so that the correction value which reflected the said differential voltage value on the output value obtained from the said continuous drive type sensor may be displayed on the said display part.
前記制御部は、前記間欠駆動式センサを通電したときに前記補正値を前記表示部に表示させ、前記間欠駆動式センサに通電しないときに前記連続駆動式センサから得た出力値を前記表示部に表示させる請求項1に記載のガス検知器。   The control unit displays the correction value on the display unit when the intermittent drive sensor is energized, and outputs the output value obtained from the continuous drive sensor when the intermittent drive sensor is not energized. The gas detector according to claim 1 to be displayed. 前記間欠駆動式センサが接触燃焼式ガスセンサであり、前記連続駆動式センサが定電位電解式ガスセンサである請求項1または2に記載のガス検知器。   The gas detector according to claim 1 or 2, wherein the intermittent drive sensor is a catalytic combustion gas sensor, and the continuous drive sensor is a constant potential electrolytic gas sensor.
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