JP2017062195A - Gas concentration measuring device and gas concentration measuring method - Google Patents

Gas concentration measuring device and gas concentration measuring method Download PDF

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JP2017062195A
JP2017062195A JP2015188171A JP2015188171A JP2017062195A JP 2017062195 A JP2017062195 A JP 2017062195A JP 2015188171 A JP2015188171 A JP 2015188171A JP 2015188171 A JP2015188171 A JP 2015188171A JP 2017062195 A JP2017062195 A JP 2017062195A
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concentration
gas concentration
gas
value
electrolyte solution
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JP6533953B2 (en
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佳武 島田
Yoshitake Shimada
佳武 島田
阪本　浩司
Koji Sakamoto
浩司 阪本
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Panasonic Intellectual Property Management Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a gas concentration measuring device and a gas concentration measuring system capable of performing accurate gas concentration measurement and abnormality determination even when used under an environment temperature exceeding a range of a normal use temperature set for a CO sensor.SOLUTION: A gas concentration measuring device is adapted to: calculate an average temperature and average humidity during a specific period in the past on the basis of a temperature measurement and a humidity measurement during the specific period by an average calculation module 52; estimate an evaporation amount of moisture in electrolyte solution of a gas sensor in a current ambient environment by an evaporation amount calculation module 53; calculate a current concentration of the electrolyte solution on the basis of the estimated evaporation amount by a solution concentration calculation module 54; correct a gas concentration corresponding to electric current output from the gas sensor with a correction value according to the current concentration of the electrolyte solution by a gas concentration correction module 56; and output the corrected gas concentration as the gas concentration under the current ambient environment.SELECTED DRAWING: Figure 1

Description

本発明は、戸内環境における一酸化炭素濃度などのガス濃度を計測するガス濃度測定装置及びガス濃度の測定方法に関するものである。   The present invention relates to a gas concentration measuring apparatus and a gas concentration measuring method for measuring a gas concentration such as a carbon monoxide concentration in the indoor environment.

特許文献１では、ＣＯセンサでＣＯ濃度を検出し、検出濃度が予め設定された警報濃度に到達すると警報を発生させる警報機を開示している。この文献では、ＣＯセンサの周囲温度とＣＯセンサ内の電解質溶液に含まれる水の蒸散量とに注目し、ＣＯセンサを所定温度が外れる周囲温度の環境下で所定時間以上使用した場合、および、蒸散量の総和が所定閾値に到達した場合に、使用温度が不適切である旨をユーザーに報知する構成となっている。   Patent Document 1 discloses an alarm device that detects a CO concentration with a CO sensor and generates an alarm when the detected concentration reaches a preset alarm concentration. In this document, paying attention to the ambient temperature of the CO sensor and the amount of transpiration of water contained in the electrolyte solution in the CO sensor, when the CO sensor is used in an ambient temperature environment where the predetermined temperature deviates from a predetermined time, and When the total amount of transpiration reaches a predetermined threshold, the user is notified that the operating temperature is inappropriate.

特開２０１１−０４３３７０号公報JP 2011-043370 A

特許文献１に記載の警報器は、ＣＯセンサに設定された通常の使用温度よりも、実際の使用場所での環境温度が外れている場合、ＣＯセンサから出力されるＣＯ濃度が、実際のＣＯ濃度よりも外れる可能性がある。
本発明は、前記の問題点に鑑みてなされたものであり、その目的とするところは、ＣＯセンサが、ＣＯセンサに設定された通常の使用温度から外れた環境温度で使用される場合でも、正確なガス濃度測定が得られ、この正確なガス濃度値に対して異常判断を行うことが可能となるガス濃度測定装置及びガス濃度測定システムを提供することである。 In the alarm device described in Patent Document 1, when the environmental temperature at the actual use place is out of the normal use temperature set in the CO sensor, the CO concentration output from the CO sensor is the actual CO. There is a possibility of deviating from the concentration.
The present invention has been made in view of the above-described problems, and the object of the present invention is that even when the CO sensor is used at an environmental temperature that deviates from the normal use temperature set for the CO sensor, An object of the present invention is to provide a gas concentration measuring apparatus and a gas concentration measuring system that can obtain accurate gas concentration measurement and can make an abnormality determination with respect to the accurate gas concentration value.

周囲環境に存在する特定のガスの濃度を検出するガス濃度測定装置である。ガス濃度測定装置は、電解質溶液を有する電気化学式のガスセンサと、周囲環境の温度を計測する温度計と、周囲環境の湿度を計測する湿度計と、メモリと、補正回路と、を備える。前記ガスセンサは、周囲環境に存在するガスとの化学反応によりガス濃度に比例する電流値を出力するように構成される。前記メモリは、連続する期間に亘って、周囲環境の温度及び湿度を計測して温度測定値と湿度測定値を蓄積する温湿度測定データテーブルを備える。前記補正回路は、過去の特定期間における温度測定値と湿度測定値からこの特定期間での平均温度値と平均湿度値に基づいて、現在の周囲環境におけるガスセンサの電解質溶液に含まれる水分の蒸散量を推定する。そして、この推定蒸散量から現在の電解質溶液の濃度を算出し、この濃度に応じた補正値で、ガスセンサから出力される電流に対応するガス濃度を補正して、これを現在の周囲環境におけるガス濃度として出力するように構成する。   This is a gas concentration measuring device that detects the concentration of a specific gas present in the surrounding environment. The gas concentration measuring device includes an electrochemical gas sensor having an electrolyte solution, a thermometer that measures the temperature of the surrounding environment, a hygrometer that measures the humidity of the surrounding environment, a memory, and a correction circuit. The gas sensor is configured to output a current value proportional to the gas concentration by a chemical reaction with a gas present in the surrounding environment. The memory includes a temperature / humidity measurement data table that measures the temperature and humidity of the surrounding environment over a continuous period and accumulates the temperature measurement value and the humidity measurement value. The correction circuit calculates the transpiration amount of water contained in the electrolyte solution of the gas sensor in the current ambient environment based on the average temperature value and the average humidity value in the specific period from the temperature measurement value and the humidity measurement value in the past specific period. Is estimated. Then, the current concentration of the electrolyte solution is calculated from the estimated transpiration amount, the gas concentration corresponding to the current output from the gas sensor is corrected with a correction value corresponding to the concentration, and the gas concentration in the current ambient environment is corrected. It is configured to output as a density.

本発明は、ガス検出センサが、広い温度範囲にわたって正確なガス濃度測定が得られ、この正確なガス濃度値に対して異常判断を行うことが可能となる。   According to the present invention, the gas detection sensor can obtain accurate gas concentration measurement over a wide temperature range, and can make an abnormality determination with respect to this accurate gas concentration value.

本発明の一実施形態に係るガス濃度測定装置を示すブロック図。The block diagram which shows the gas concentration measuring apparatus which concerns on one Embodiment of this invention. 同上のガス濃度測定装置におけるガス濃度補正の原理を示すグラフ図。The graph which shows the principle of the gas concentration correction | amendment in a gas concentration measuring apparatus same as the above. 同上のガス濃度測定装置の動作を示すフロー図。The flowchart which shows operation | movement of the gas concentration measuring apparatus same as the above.

（第１の実施形態）
本発明の一実施形態に係るガス濃度測定装置は、室内での周囲環境に出現する一酸化炭素などのガス濃度を測定するために使用され、図１に示すように、電気化学式のガスセンサ１０に加え、周囲環境での温度と湿度を計測する温度計２０及び湿度計３０と、ガスセンサ１０から出力される電流値を温湿度に基づいて補正する補正回路５０を備える。
ガスセンサ１０は、電解質水溶液を蓄える容器１２を備える。容器１２の一端開口は、対象ガスであるＣＯガスを透過させる透過膜１３で塞がれ、他端開口は空気中の酸素を透過させる透過膜１５で塞がれる。このガスセンサ１０は、透過膜１３の内側に配した金属触媒を含む検知電極１４と透過膜１５内側の基準電極１６との間に一定の電圧を印加する定電圧源１８を有し、検知電極１４とこれに対向配置した金属触媒を含む対向電極１７との間に流れる電流がガス濃度に比例するものとして出力される。検知電極１４はガスを透過させる材料で形成され、検知電極１４を通して取り込むＣＯガスが電解質水溶液中の水と化学反応することで電子が放出され、この電子が対向電極１７で電解質水溶液に取り込まれる酸素と反応することで、検知電極と対向電極との間に電流が発生する。このため、ガスセンサが出力する電流値は周囲環境でのガス濃度に比例する。すなわち、検知電極１４側では、ＣＯ + Ｈ２Ｏ → ＣＯ２ ＋２Ｈ２＋２ｅ―の反応が起こり、対向電極１７側では、外部から酸素を取り込んで、（１／２）Ｏ２＋２Ｈ＋＋２ｅ― → Ｈ２Ｏの化学反応を起こして、電流が検知電極１４と対向電極１７との間に流れ、この電流の値がガス濃度に比例する。
電解質水溶液としては希硫酸が使用されており、周囲環境の温度と湿度に応じて、水溶液中の水分が蒸散することがある。このため、電解質センサは、周囲環境の温度と湿度の変動に起因して電解質水溶液の水分量が変動することで、電流値にも変動が生じることがあり、電流値から直接ガス濃度を算出する場合、誤差が避けられない。本発明のガス濃度測定装置では、補正回路５０を採用し、このような周囲環境の変化に起因する誤差を考慮して、より正確なガス濃度の測定を行う。
補正回路５０は、温度計２０と湿度計３０から温湿度測定データテーブル６２に渡された温度測定値と湿度測定値に基づいて、ガスセンサ１０から出力される電流値を補正するように構成される。
ガス濃度測定装置はＣＰＵを備えており、ＣＰＵでの実行されるプログラムでの指令に基づいて、温度計２０の温度測定値、湿度計３０の湿度測定値が、継続的に、例えば、１０分毎に温湿度測定データテーブル６２に保持される。この温湿度測定データテーブル６２は、メモリ６０内に形成される。メモリ６０には、この他、電解質溶液濃度テーブル６４、ガス濃度補正テーブル６６、及びデータ記録テーブル６５が構築されている。
電解質溶液濃度テーブル６４は、ガスセンサの電解質溶液に含まれる水分の蒸散量と、電解質溶液の濃度との関係を規定するデータを記憶している。ガス濃度補正テーブル６６は、図２に示すように、標準の電解質溶液濃度Ｃｓにおける電流値Ｉと対象ガスの濃度Ｄとの関係を規定するガス濃度判定基準Ｒｓと、標準の電解質溶液濃度からずれた電解質濃度Ｃ１、Ｃ２、Ｃ３・・Ｃｎにおける電流値に対応するガス濃度を、標準の電解質溶液濃度におけるガス濃度に対応させる補正値を示すデータを保持している。
補正回路５０は、ＣＰＵで実行されるプログラムによって実現され、図１に示すように平均値算出モジュール５２、蒸散量算出モジュール５３、溶解液濃度算出モジュール５４、ガス濃度補正モジュール５６を備える。
平均値算出モジュール５２は、温湿度測定データテーブル６２から温度測定値及び湿度測定値を読み出し、特定の時間範囲、例えば、１日当りの温度平均値、湿度平均値を求め、平均温度、平均湿度をその日付に関連づけてデータ記録テーブル６５に蓄積させる。
実際のガス濃度の決定を行うため、補正回路５０は、図３に示すフローに基づいて動作する。先ず、蒸散量算出モジュール５３は、データ記録テーブル６５から、前日の温度平均値と湿度平均値を読み出して（Ｓ１，Ｓ２）、これらの温度平均値及び湿度平均値によっ
て一義的に決まる飽和水蒸気量とその時点での水蒸気量から、電解質溶液における水分の蒸散量を推定する（Ｓ３）。すなわち、蒸散量算出モジュール５３は、既知の式を実行して、温度と湿度から飽和水蒸気量と水蒸気量とを計算し、蒸散量が飽和水蒸気量から水蒸気量を減じた値として求められる。この値は溶解液濃度算出モジュール５４に渡され、ここで、電解質溶液濃度テーブル６４を参照して、推定された蒸散量に対応する電解質溶液濃度を求める（Ｓ４）。
溶解液濃度算出モジュール５４は、ここで求められた電解質溶液濃度をデータ記録テーブル６５に渡し、後述する寿命判定部９０でのデータ分析のために電解質溶液を温度および湿度、測定時刻と関連付けてデータ記録テーブル６５に記憶する。
ガス濃度補正モジュール５６は、メモリ６０内のガス濃度補正テーブル６６を参照して、求められた電解質溶液濃度が標準の電解質濃度とどれくらいずれているかを求め（Ｓ５）、ずれに応じた補正値を取得し（Ｓ６）、この補正値をガスセンサ１０から出力される電流値に適用することで（Ｓ７）、溶解液濃度に応じた正確なガス濃度を算出してこれを出力する（Ｓ８）。すなわち、ガス濃度補正テーブル６６は、図２に示すように、標準の電解質濃度Ｃｓでの電流値とガス濃度との関係Ｒｓを示すデータに基づいて、標準電解質濃度Ｃｓに対する溶解液濃度のずれを濃度比Ｃ１、Ｃ２、Ｃ３．．．Ｃｎで表した場合について、濃度比における電流とガス濃度の関係を、標準電解質濃度における電流値とガス濃度に換算する補正値を保持している。このため、ガス濃度補正モジュール５６は、溶解液濃度算出モジュール５４からの溶解液濃度に対応する補正値をガス濃度補正テーブル６６から読み出し、この補正値をガスセンサ１０からの電流値に適用することで、実際のガス濃度を算出する。補正値の一例としては、図２に示すような各濃度比において、電流値に対応して求められる仮のガス濃度に加減算される濃度であってもよく、このような仮のガス濃度に乗算される係数であってもよい。ガス濃度補正モジュール５６は、ここに算出した実際のガス濃度をデータ記録テーブル６５に渡し、後述するデータ分析のために、ガス濃度を温度および湿度の測定時刻を関連付けて、データ記録テーブル６５に記憶する。
本実施形態におけるガス濃度測定装置は、補正回路５０に加えて、警告部８０、寿命判定部９０、及び通信部７０を備える。
警告部８０は、対象ガスについて許容される濃度を示す基準値を有しており、ガス濃度補正モジュール５６から出力されるガス濃度が基準値を逸脱した時に、警報を発生させるように構成されている。
寿命判定部９０は、故障判断回路９２と、故障までの寿命を予測する寿命推定回路９４を備える。故障判断回路９２には、標準電解質濃度に対する現実の溶解液濃度のずれ幅に関して許容された範囲を規定する許容動作範囲が設定されており、データ記録テーブル６５から読み出した現在の溶解液濃度と標準電解質濃度Ｃｓとのずれを求め、このずれが許容動作範囲を超えた時には、ガス濃度測定装置が故障であると判断して、警告を出力するように構成されている。
寿命推定回路９４には、上の許容動作範囲よりも狭い安定動作範囲が設定されている。データ記録テーブル６５から読み出す溶解液濃度と標準電解質濃度Ｃｓとのずれが、許容動作範囲内であるが、安定動作範囲を逸脱した回数や継続して逸脱している期間をパラメータとして、溶解液濃度が許容動作範囲を超えるまでの時間を推測する。推測された時間が所定の基準値よりも小さい時に、ガスセンサの寿命が迫っていると判定し、寿命が近い旨の警告を出力するように構成される。
寿命判定部は、上の構成の代わりに、下記の変更態様に示す構成とすることも可能である。
（変更態様１）
寿命判定部９０は、データ記録テーブル６５から平均温度と平均湿度の履歴を読み出し、平均温度と平均湿度について、ガスセンサが正常に動作する範囲から逸脱した期間を算出し、この期間が許容限度を超えたときに、ガスセンサの寿命末期であると判定して、その警告を出力するように構成される。
（変更態様２）
寿命判定部９０は、データ記録テーブル６５から蒸散量の履歴を読み出し、蒸散量について、ガスセンサが正常に動作する範囲から逸脱した期間を算出し、この期間が許容限度を超えたときに、ガスセンサの寿命末期であると判定して、その警告を出力するように構成される。
（変更態様３）
寿命判定部９０は、データ記録テーブル６５からガス濃度の履歴を読み出し、ガス濃度について、ガスセンサが正常に動作する範囲から逸脱した期間を算出し、この期間が許容限度を超えたときに、ガスセンサの寿命末期であると判定して、その警告を出力するように構成される。
本実施形態のガス濃度測定装置は、通信部７０を備え、この通信部はガス濃度補正モジュール５６から出力されるガス濃度を、無線ネットワークを介して、外部の監視装置へ送信する。例えば、複数のガス濃度測定装置を、無線ネットワークにより外部の監視装置にリンクすることで、ガス濃度測定システムが構築される。この場合、各ガス濃度測定装置は、子機として、対象空間における異なる場所に設置され、親機として動作する外部の監視装置が、異なる場所におけるガス濃度を監視して、対象空間を管理する。
本発明のガス濃度検出装置や方法を、親機と少なくとも一つの子機とで構成される通信システムに適用する場合は、子機にガスセンサ、温度計、湿度計を配置し、親機に補正回路５０、メモリ６０，警告部８０、寿命判定部９０の付加機能要素を配置する。これにより、子機で測定するガスセンサの電流値、温度、湿度が定期的に親機に送信され、親機でガス濃度の補正や各種の警告を行うことができる。 (First embodiment)
A gas concentration measuring apparatus according to an embodiment of the present invention is used to measure a gas concentration of carbon monoxide or the like that appears in an ambient environment in a room, and as shown in FIG. In addition, a thermometer 20 and a hygrometer 30 that measure temperature and humidity in the surrounding environment, and a correction circuit 50 that corrects the current value output from the gas sensor 10 based on the temperature and humidity.
The gas sensor 10 includes a container 12 that stores an aqueous electrolyte solution. One end opening of the container 12 is closed with a permeable membrane 13 that allows CO gas, which is the target gas, to pass therethrough, and the other end opening is closed with a permeable membrane 15 that allows oxygen in the air to pass therethrough. The gas sensor 10 includes a constant voltage source 18 that applies a constant voltage between a detection electrode 14 including a metal catalyst disposed inside the permeable membrane 13 and a reference electrode 16 inside the permeable membrane 15. And a current flowing between the counter electrode 17 including the metal catalyst disposed opposite thereto is output as being proportional to the gas concentration. The sensing electrode 14 is formed of a material that allows gas to pass through. The CO gas taken in through the sensing electrode 14 chemically reacts with the water in the electrolyte aqueous solution to release electrons, and the electrons are taken into the electrolyte aqueous solution by the counter electrode 17. Reacts with each other to generate a current between the detection electrode and the counter electrode. For this reason, the current value output from the gas sensor is proportional to the gas concentration in the surrounding environment. That is, the reaction of CO + H 2 O → CO 2 + 2H 2 + 2e − occurs on the detection electrode 14 side, and oxygen is taken in from the outside on the counter electrode 17 side, and (1/2) O 2 + 2H + + 2e − → H A chemical reaction of 2 O occurs, and a current flows between the detection electrode 14 and the counter electrode 17, and the value of this current is proportional to the gas concentration.
Diluted sulfuric acid is used as the electrolyte aqueous solution, and the water in the aqueous solution may evaporate depending on the temperature and humidity of the surrounding environment. For this reason, the electrolyte sensor may cause fluctuations in the current value due to fluctuations in the amount of water in the aqueous electrolyte solution due to fluctuations in the temperature and humidity of the surrounding environment, and the gas concentration is directly calculated from the current value. If the error is inevitable. In the gas concentration measuring apparatus of the present invention, the correction circuit 50 is employed, and the gas concentration is measured more accurately in consideration of such an error caused by the change in the surrounding environment.
The correction circuit 50 is configured to correct the current value output from the gas sensor 10 based on the temperature measurement value and the humidity measurement value passed from the thermometer 20 and the hygrometer 30 to the temperature / humidity measurement data table 62. .
The gas concentration measuring device includes a CPU, and the temperature measurement value of the thermometer 20 and the humidity measurement value of the hygrometer 30 are continuously measured, for example, 10 minutes based on a command in a program executed by the CPU. The temperature / humidity measurement data table 62 holds each time. The temperature / humidity measurement data table 62 is formed in the memory 60. In addition, an electrolyte solution concentration table 64, a gas concentration correction table 66, and a data recording table 65 are constructed in the memory 60.
The electrolyte solution concentration table 64 stores data defining the relationship between the amount of transpiration of moisture contained in the electrolyte solution of the gas sensor and the concentration of the electrolyte solution. As shown in FIG. 2, the gas concentration correction table 66 is shifted from the standard electrolyte solution concentration and the gas concentration determination standard Rs that defines the relationship between the current value I and the target gas concentration D at the standard electrolyte solution concentration Cs. Further, data indicating a correction value for correlating the gas concentration corresponding to the current value in the electrolyte concentrations C1, C2, C3,... Cn with the gas concentration in the standard electrolyte solution concentration is held.
The correction circuit 50 is realized by a program executed by the CPU, and includes an average value calculation module 52, a transpiration amount calculation module 53, a solution concentration calculation module 54, and a gas concentration correction module 56 as shown in FIG.
The average value calculation module 52 reads the temperature measurement value and the humidity measurement value from the temperature / humidity measurement data table 62, obtains a specific time range, for example, the temperature average value and the humidity average value per day, and calculates the average temperature and the average humidity. It is stored in the data recording table 65 in association with the date.
In order to determine the actual gas concentration, the correction circuit 50 operates based on the flow shown in FIG. First, the transpiration amount calculation module 53 reads the temperature average value and humidity average value of the previous day from the data recording table 65 (S1, S2), and the saturated water vapor amount uniquely determined by these temperature average value and humidity average value. And the amount of transpiration of water in the electrolyte solution is estimated from the water vapor amount at that time (S3). That is, the transpiration amount calculation module 53 executes a known formula to calculate the saturated water vapor amount and the water vapor amount from the temperature and humidity, and the transpiration amount is obtained as a value obtained by subtracting the water vapor amount from the saturated water vapor amount. This value is passed to the dissolved solution concentration calculation module 54, where the electrolyte solution concentration corresponding to the estimated transpiration amount is obtained with reference to the electrolyte solution concentration table 64 (S4).
The dissolved solution concentration calculation module 54 passes the obtained electrolyte solution concentration to the data recording table 65, and associates the electrolyte solution with the temperature, humidity, and measurement time for data analysis in the life determination unit 90 described later. Store in the recording table 65.
The gas concentration correction module 56 refers to the gas concentration correction table 66 in the memory 60 to determine how much the obtained electrolyte solution concentration is equal to the standard electrolyte concentration (S5), and calculates a correction value corresponding to the deviation. By acquiring (S6) and applying this correction value to the current value output from the gas sensor 10 (S7), an accurate gas concentration corresponding to the dissolved solution concentration is calculated and output (S8). That is, as shown in FIG. 2, the gas concentration correction table 66 shows the deviation of the solution concentration with respect to the standard electrolyte concentration Cs based on the data indicating the relationship Rs between the current value and the gas concentration at the standard electrolyte concentration Cs. Concentration ratios C1, C2, C3. . . For the case represented by Cn, a correction value for maintaining the relationship between the current and gas concentration in the concentration ratio into the current value and gas concentration in the standard electrolyte concentration is held. For this reason, the gas concentration correction module 56 reads the correction value corresponding to the dissolved solution concentration from the dissolved solution concentration calculation module 54 from the gas concentration correction table 66 and applies this correction value to the current value from the gas sensor 10. Calculate the actual gas concentration. An example of the correction value may be a concentration that is added to or subtracted from the provisional gas concentration obtained corresponding to the current value in each concentration ratio as shown in FIG. 2, and such provisional gas concentration is multiplied. It may be a coefficient. The gas concentration correction module 56 passes the actual gas concentration calculated here to the data recording table 65, and stores the gas concentration in the data recording table 65 in association with the measurement time of temperature and humidity for data analysis to be described later. To do.
The gas concentration measurement apparatus according to the present embodiment includes a warning unit 80, a life determination unit 90, and a communication unit 70 in addition to the correction circuit 50.
The warning unit 80 has a reference value indicating an allowable concentration for the target gas, and is configured to generate an alarm when the gas concentration output from the gas concentration correction module 56 deviates from the reference value. Yes.
The life determination unit 90 includes a failure determination circuit 92 and a life estimation circuit 94 that predicts the life until failure. In the failure determination circuit 92, an allowable operation range that defines an allowable range with respect to a deviation width of the actual solution concentration with respect to the standard electrolyte concentration is set. The current solution concentration read from the data recording table 65 and the standard are set. A deviation from the electrolyte concentration Cs is obtained, and when the deviation exceeds the allowable operation range, it is determined that the gas concentration measuring device is out of order and a warning is output.
In the life estimation circuit 94, a stable operation range narrower than the above allowable operation range is set. Although the deviation between the dissolved solution concentration read from the data recording table 65 and the standard electrolyte concentration Cs is within the allowable operating range, the number of times of deviating from the stable operating range and the period of deviating continuously are used as parameters. Estimate the time until it exceeds the allowable operating range. When the estimated time is smaller than a predetermined reference value, it is determined that the life of the gas sensor is approaching, and a warning that the life is near is output.
The life determination unit may have a configuration shown in the following modification instead of the above configuration.
(Modification 1)
The life determination unit 90 reads the history of the average temperature and the average humidity from the data recording table 65, calculates the period of deviation from the range in which the gas sensor normally operates for the average temperature and the average humidity, and this period exceeds the allowable limit. When it is determined that the gas sensor is at the end of its life, a warning is output.
(Modification 2)
The life determination unit 90 reads the history of the transpiration amount from the data recording table 65, calculates a period of deviation from the range in which the gas sensor normally operates for the transpiration amount, and when this period exceeds an allowable limit, It is determined that the end of life is reached and the warning is output.
(Modification 3)
The life determination unit 90 reads the gas concentration history from the data recording table 65, calculates a period of deviation from the range in which the gas sensor operates normally with respect to the gas concentration, and when this period exceeds the allowable limit, It is determined that the end of life is reached and the warning is output.
The gas concentration measurement device of this embodiment includes a communication unit 70, and this communication unit transmits the gas concentration output from the gas concentration correction module 56 to an external monitoring device via a wireless network. For example, a gas concentration measuring system is constructed by linking a plurality of gas concentration measuring devices to an external monitoring device via a wireless network. In this case, each gas concentration measuring device is installed as a slave unit at a different location in the target space, and an external monitoring device operating as the parent device monitors the gas concentration at the different location and manages the target space.
When the gas concentration detection apparatus and method of the present invention is applied to a communication system composed of a master unit and at least one slave unit, a gas sensor, a thermometer, and a hygrometer are arranged in the slave unit, and correction is performed in the master unit. Additional functional elements of the circuit 50, the memory 60, the warning unit 80, and the life determination unit 90 are arranged. Thereby, the current value, temperature, and humidity of the gas sensor measured by the slave unit are periodically transmitted to the master unit, and the gas concentration can be corrected and various warnings can be performed by the master unit.

１０ ガスセンサ
２０ 温度計
３０ 湿度計
５０ 補正回路
５２ 平均値算出モジュール
５３ 蒸散量算出モジュール
５６ ガス濃度補正モジュール
６０ メモリ
６２ 温湿度測定データテーブル
６４ 電解質溶液濃度テーブル
６５ データ記録テーブル
６６ ガス濃度補正テーブル
７０ 通信部
８０ 警告部
９０ 寿命判定部 DESCRIPTION OF SYMBOLS 10 Gas sensor 20 Thermometer 30 Hygrometer 50 Correction circuit 52 Average value calculation module 53 Transpiration amount calculation module 56 Gas concentration correction module 60 Memory 62 Temperature / humidity measurement data table 64 Electrolyte solution concentration table 65 Data recording table 66 Gas concentration correction table 70 Communication Part 80 warning part 90 life judgment part

Claims (9)

周囲環境に存在する特定のガスの濃度を検出するガス濃度測定装置であって、
電解質溶液を有する電気化学式のガスセンサと、
周囲環境の温度を計測する温度計と、
周囲環境の湿度を計測する湿度計と、
メモリと、
補正回路と、
を備え、
前記ガスセンサは、周囲環境に存在するガスとの化学反応によりガス濃度に比例する電流値を出力するように構成され、
前記メモリは、
連続する期間に亘って、周囲環境の温度及び湿度を計測して温度測定値と湿度測定値を蓄積する温湿度測定データテーブルを備え、
前記補正回路は、
過去の特定期間における温度測定値と湿度測定値からこの特定期間での平均温度値と平均湿度値に基づいて、現在の周囲環境におけるガスセンサの電解質溶液に含まれる水分の蒸散量を推定し、この推定蒸散量から現在の電解質溶液の濃度を算出し、この濃度に応じた補正値で、ガスセンサから出力される電流に対応するガス濃度を補正して、これを現在の周囲環境におけるガス濃度として出力するように構成されたガス濃度測定装置。 A gas concentration measuring device for detecting the concentration of a specific gas present in the surrounding environment,
An electrochemical gas sensor having an electrolyte solution;
A thermometer that measures the temperature of the surrounding environment,
A hygrometer that measures the humidity of the surrounding environment,
Memory,
A correction circuit;
With
The gas sensor is configured to output a current value proportional to the gas concentration by a chemical reaction with a gas present in the surrounding environment,
The memory is
A temperature / humidity measurement data table for measuring temperature and humidity of the surrounding environment and accumulating temperature measurement values and humidity measurement values over a continuous period of time is provided.
The correction circuit includes:
Based on the average temperature value and average humidity value in this specific period from the temperature measurement value and humidity measurement value in a specific period in the past, the amount of transpiration of moisture contained in the gas sensor electrolyte solution in the current ambient environment is estimated. Calculate the current concentration of the electrolyte solution from the estimated transpiration rate, correct the gas concentration corresponding to the current output from the gas sensor with the correction value corresponding to this concentration, and output this as the gas concentration in the current ambient environment A gas concentration measuring device configured to do. 前記補正回路は、
過去の特定期間における温度測定値と湿度測定値からこの特定期間での平均温度値と平均湿度値を求める平均値算出モジュールと、
前記の平均温度値と前記の平均湿度値から現在の周囲環境におけるガスセンサの電解質溶液に含まれる水分の蒸散量を推定する蒸散量算出モジュールと
を備え、
前記メモリは、更に、前記の水分の蒸散量と前記電解質溶液の濃度との関係を示す電解質濃度テーブルを備え、
前記補正回路は、更に、推定した前記蒸散量に対応する電解質濃度を前記電解質濃度テーブルから読み出して現在の電解質溶液濃度を決定するように構成された電解液濃度算出モジュールを備え、
前記メモリは、更に標準の電解質溶液濃度における電流値とガス濃度との関係を規定するガス濃度判定基準を用い、標準の電解質溶液濃度に対して変動する電解質溶液濃度のずれ量を対応させて、電流値とガス濃度との関係を、標準のガス濃度判定基準に適合させるための補正値を記録したガス濃度補正テーブルを有し、
前記補正回路は、更に、標準の電解質溶液濃度と現在の電解質溶液濃度とずれを求め、前記ガス濃度補正テーブルを参照して、このずれに対応する補正値を求め、ガスセンサから出力される電流に対応するガス濃度をこの補正値で補正して、これを現在の周囲環境におけるガス濃度として出力するように構成されたガス濃度補正モジュールを有する請求項１に記載のガス濃度測定装置。 The correction circuit includes:
An average value calculation module for calculating an average temperature value and an average humidity value in the specific period from the temperature measurement value and the humidity measurement value in the past specific period;
A transpiration amount calculation module for estimating the transpiration amount of moisture contained in the electrolyte solution of the gas sensor in the current ambient environment from the average temperature value and the average humidity value;
The memory further includes an electrolyte concentration table indicating a relationship between the moisture transpiration amount and the concentration of the electrolyte solution,
The correction circuit further includes an electrolyte concentration calculation module configured to read an electrolyte concentration corresponding to the estimated transpiration amount from the electrolyte concentration table and determine a current electrolyte solution concentration,
The memory further uses a gas concentration criterion that defines the relationship between the current value and the gas concentration at the standard electrolyte solution concentration, and corresponds to the deviation amount of the electrolyte solution concentration that varies with respect to the standard electrolyte solution concentration. It has a gas concentration correction table that records correction values for adapting the relationship between the current value and gas concentration to the standard gas concentration criteria.
The correction circuit further obtains a deviation between the standard electrolyte solution concentration and the current electrolyte solution concentration, obtains a correction value corresponding to the deviation with reference to the gas concentration correction table, and determines the current output from the gas sensor. The gas concentration measuring device according to claim 1, further comprising a gas concentration correction module configured to correct a corresponding gas concentration with the correction value and output the corrected gas concentration as a gas concentration in the current ambient environment. 前記ガスは一酸化炭素であり、前記電解質溶液は希硫酸である請求項１または２に記載のガス濃度測定装置。 The gas concentration measuring device according to claim 1 or 2, wherein the gas is carbon monoxide and the electrolyte solution is dilute sulfuric acid. 前記補正回路から出力されるガス濃度値が基準値を超えた時に警報を出力するように構成された警告部８０を備えた請求項１から３のいずれかに記載のガス濃度測定装置。 The gas concentration measuring device according to any one of claims 1 to 3, further comprising a warning unit 80 configured to output an alarm when a gas concentration value output from the correction circuit exceeds a reference value. 前記メモリは、前記平均値算出モジュールで算出される平均温度及び平均湿度を時間に関連づけて記憶するように構成されたデータ記録テーブルを備え、
前記データ記録テーブルから平均温度と平均湿度の時系列データを読み出して、平均温度と平均湿度の推移を分析してガスセンサの寿命を判定するように構成された寿命判定部を備えた請求項２〜４のいずれかに記載のガス濃度測定装置。 The memory includes a data recording table configured to store an average temperature and an average humidity calculated by the average value calculation module in association with time,
A life determination unit configured to read time series data of average temperature and average humidity from the data recording table and analyze the transition of the average temperature and average humidity to determine the life of the gas sensor. 4. The gas concentration measuring device according to any one of 4 above. 前記メモリは、前記蒸散量算出モジュールで算出される蒸散量を時間に関連づけて記憶するように構成されたデータ記録テーブルを備え、
前記データ記録テーブルから蒸散量を読み出して、蒸散量の総計が所定の基準値を超えたときに、前記ガスセンサが寿命末期であることを判定して寿命が近づいたことを報知するように構成された寿命判定部を備えた請求項２〜４のいずれかに記載のガス濃度測定装置。 The memory includes a data recording table configured to store the transpiration amount calculated by the transpiration amount calculation module in association with time,
The transpiration amount is read from the data recording table, and when the total transpiration amount exceeds a predetermined reference value, it is determined that the gas sensor is at the end of its life and notifies that the life is approaching. The gas concentration measuring apparatus according to claim 2, further comprising a life determination unit. 前記メモリは、前記電解液濃度算出モジュールで算出される溶解液濃度を時間に関連づけて記憶するように構成されたデータ記録テーブルを備え、
前記データ記録テーブルから溶解液濃度を読み出して、溶解液濃度の変動が所定の基準を逸脱したときに、前記ガスセンサが寿命末期であることを判定して寿命が近づいたことを報知するように構成された寿命判定部を備えた請求項２〜４のいずれかに記載のガス濃度測定装置。 The memory includes a data recording table configured to store the concentration of the solution calculated by the electrolyte concentration calculation module in association with time,
The dissolved solution concentration is read from the data recording table, and when the variation of the dissolved solution concentration deviates from a predetermined standard, it is determined that the gas sensor is at the end of its life and the life is approaching. The gas concentration measuring device according to any one of claims 2 to 4, further comprising a life determining unit. 前記ガス濃度補正モジュールから出力されるガス濃度値を無線ネットワークを通じて外部の監視装置へ送信するように構成された通信部を備えた特徴とする請求項１から７のいずれかに記載のガス濃度測定装置。 The gas concentration measurement according to any one of claims 1 to 7, further comprising: a communication unit configured to transmit a gas concentration value output from the gas concentration correction module to an external monitoring device through a wireless network. apparatus. 周囲環境に存在する特定のガスの濃度を検出する方法であって、
連続する期間に亘って、周囲環境の温度及び湿度を計測して温度測定値と湿度測定値を蓄積し、
過去の特定期間における温度測定値と湿度測定値からこの特定期間での平均温度値と平均湿度値を求め、
電解質溶液を有する電気化学式のガスセンサを使用して、現在の周囲環境に存在する対象ガスと電解質溶液との化学反応に伴って生じる電流値を取得し、
平均温度値と平均湿度値から現在の周囲環境におけるガスセンサの電解質溶液に含まれる水分の蒸散量を推定し、
水分の蒸散量と前記電解質溶液の濃度との関係を示す電解質濃度テーブルを使用して、推定した蒸散量に対応する電解質濃度を取得して現在の電解質溶液濃度を決定し、
標準の電解質溶液濃度における電流値とガス濃度との関係を規定するガス濃度判定基準を用い、標準の電解質溶液濃度に対して変動する電解質溶液濃度のずれ量を対応させて、電流値とガス濃度との関係を、標準のガス濃度判定基準に適合させるための補正値を記録した濃度補正テーブルを準備し、
標準の電解質溶液濃度と現在の電解質溶液濃度とずれを求め、前記の濃度補正テーブルを参照して、このずれに対応する補正値を求め、ガスセンサから出力される電流に対応するガス濃度をこの補正値で補正して、これを現在の周囲環境におけるガス濃度として出力するガス濃度測定方法。 A method for detecting the concentration of a specific gas present in the surrounding environment,
Over a continuous period, the temperature and humidity of the surrounding environment are measured and the temperature measurement value and humidity measurement value are accumulated.
Find the average temperature value and average humidity value in this specific period from the temperature measurement value and humidity measurement value in the past specific period,
Using an electrochemical gas sensor with an electrolyte solution, obtain the current value generated by the chemical reaction between the target gas and the electrolyte solution present in the current ambient environment,
Estimate the transpiration of moisture contained in the gas sensor electrolyte solution in the current ambient environment from the average temperature value and average humidity value,
Using an electrolyte concentration table showing the relationship between the amount of transpiration of moisture and the concentration of the electrolyte solution, the current electrolyte solution concentration is determined by obtaining the electrolyte concentration corresponding to the estimated transpiration amount,
Using a gas concentration criterion that defines the relationship between the current value and gas concentration at the standard electrolyte solution concentration, the current value and gas concentration are correlated with the amount of deviation in the electrolyte solution concentration that varies with respect to the standard electrolyte solution concentration. Prepare a concentration correction table that records the correction values to match the relationship with the standard gas concentration criteria,
Find the deviation between the standard electrolyte solution concentration and the current electrolyte solution concentration, refer to the concentration correction table above, find the correction value corresponding to this deviation, and correct the gas concentration corresponding to the current output from the gas sensor A gas concentration measurement method that corrects the value and outputs it as the gas concentration in the current ambient environment.
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