JPH116826A - Water quality monitoring system - Google Patents
Water quality monitoring systemInfo
- Publication number
- JPH116826A JPH116826A JP15853397A JP15853397A JPH116826A JP H116826 A JPH116826 A JP H116826A JP 15853397 A JP15853397 A JP 15853397A JP 15853397 A JP15853397 A JP 15853397A JP H116826 A JPH116826 A JP H116826A
- Authority
- JP
- Japan
- Prior art keywords
- water
- pipe
- sampling
- water quality
- quality
- 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.)
- Granted
Links
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、上水等の水質の
監視を行う水質モニターシステムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality monitoring system for monitoring the quality of water such as clean water.
【０００２】[0002]
【従来の技術】例えば、上水道において、各管路又は同
一管路で一定間隔毎にその水質をモニターすることは非
常に重要であり、その一般のモニターシステムは、図１
に示すように、複数の管路又は同一管路に付設されたそ
の管路の各水質自動監視装置Ａ1 、Ａ2 ……Ａｎ（総称
符号：Ａ）から、そのそれぞれの検出データを中央監視
センタＣに、モデム伝送、テレメータ伝送等により伝送
し、中央監視センタＣにおいて、その各検出データに基
づき、前記各管路の水質をモニターするものである。中
央監視センタＣでは、データ収集処理のみならず、各水
質自動監視装置Ａに各種信号を伝送してその制御も行
う。図中、Ｐはホストコンピュータ、Ｑはプリンターで
ある。2. Description of the Related Art For example, in waterworks, it is very important to monitor the water quality at regular intervals in each pipeline or the same pipeline, and a general monitoring system is shown in FIG.
As shown in ( 1 ), the respective monitoring data are centrally monitored from a plurality of pipelines or the respective automatic water quality monitoring devices A 1 , A 2 ... An (general symbol: A) of the pipelines. The data is transmitted to the center C by modem transmission, telemeter transmission, or the like, and the central monitoring center C monitors the water quality of each pipe based on the detected data. In the central monitoring center C, not only the data collection processing but also various signals are transmitted to the automatic water quality monitoring devices A to control them. In the figure, P is a host computer, and Q is a printer.
【０００３】その水質自動監視装置Ａは、例えば、図２
に示すように、水道本管ａから分岐した検水管ｂが導入
され、この検出管ｂを流れる水を、センサーユニット部
Ｕで各種の検出を行い、その検出データを、アンプ部
Ｂ、測定制御部Ｄを介し、伝送受信部Ｅから中央監視セ
ンタＣに伝送する。測定制御部Ｄはセンサーユニット部
Ｕ等の制御を行い、水質異常を発見すれば、バルブＶを
閉じて水道本管ａを遮断するものもある。The automatic water quality monitoring device A is, for example, shown in FIG.
As shown in (1), a water sample pipe b branched from the water main pipe a is introduced, and the water flowing through the detection pipe b is subjected to various kinds of detection by the sensor unit U, and the detected data is sent to the amplifier B for measurement control. The data is transmitted from the transmission receiving unit E to the central monitoring center C via the unit D. The measurement control section D controls the sensor unit section U and the like, and when it finds an abnormality in water quality, there is a type in which the valve V is closed to shut off the water main a.
【０００４】センサーユニット部Ｕは、例えば図３に示
すように、各種の弁を介して、水温計、水圧計等を検水
管ｂに適宜に接続可能としたものであり、各弁を測定制
御部Ｄで任意に開閉することにより、所要の水質検査を
行う。この検査は、設定項目を一定時間毎に自動的に行
い、この検出データは中央監視センタＣに自動的に同時
に伝送される。万一、検出データ（計測値）に異常値が
発生すれば、警報が同センタＣに通報される。As shown in FIG. 3, for example, a sensor unit U is configured such that a water temperature gauge, a water pressure gauge, and the like can be connected to a water test tube b via various valves as appropriate. A required water quality test is performed by opening and closing the part arbitrarily. In this inspection, the setting items are automatically performed at fixed time intervals, and the detection data is automatically and simultaneously transmitted to the central monitoring center C. If an abnormal value occurs in the detection data (measurement value), an alarm is notified to the center C.
【０００５】[0005]
【発明が解決しようとする課題】従来のシステムでは、
試料水（検水）は各検査を終えた後、装置Ａ内には貯留
せずに排出されている。このため、ある水質自動監視装
置Ａでの水質に異常があったことはデータをみれば判断
できるが、試料水自体が残っていないから、本当にその
異常が発生した時の水質が異常であったかどうかの物的
証拠としては残らないことになる。In the conventional system,
After each test, the sample water (water sample) is discharged without being stored in the device A. For this reason, it can be determined by looking at the data that there was an abnormality in the water quality at a certain automatic water quality monitoring device A. Will not remain as physical evidence of
【０００６】通常、異常値発生の警報を受けると、該当
現場に出かけて採水し、採水した試料水を新たに分析・
計測して自動計測結果との確認が行われるが、時間的に
ほぼ同じ試料水が確保できるのは現場近くのみとなり、
遠方や夜間など、作業者が少ないときは現場での採水が
時間的に大幅に遅れる。このときは、大幅時間遅れで採
水した試料水の計測結果と自動計測値との整合性に問題
がある。[0006] Normally, when an alarm for occurrence of an abnormal value is received, the user goes to the corresponding site and collects water, and newly analyzes the sampled water.
Measurement and confirmation of the automatic measurement result are performed, but almost the same sample water can be secured only near the site in time,
When there are few workers, such as in the distance or at night, water sampling at the site is greatly delayed in terms of time. In this case, there is a problem in the consistency between the measurement result of the sample water sampled with a large delay and the automatic measurement value.
【０００７】この発明は、上記実情に鑑み、採水の計測
結果（検出データ）と自動計測値との整合性を高めるこ
とを課題とする。[0007] In view of the above circumstances, it is an object of the present invention to improve the consistency between a measurement result (detection data) of water sampling and an automatic measurement value.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に、この発明は、上記水質自動監視装置に自動採水機能
を付加し、管路の水質異常を検出したとき、その自動採
水機能によって、その異常水を採取するようにしたので
ある。In order to solve the above-mentioned problems, the present invention adds an automatic water sampling function to the above-mentioned automatic water quality monitoring device, and when the water quality abnormality of the pipeline is detected, the automatic water sampling function is provided. In this way, the abnormal water was collected.
【０００９】異常検出時の水を採取するので、その異常
時の採水を分析することとなり、その分析・計測結果と
自動計測値が整合することとなる。このため、その異常
が水質本来の異常か否かの信頼性が高くなる。因みに、
異常検出は、装置の異常等の水質以外の要因によって生
じる場合もあるからである。Since water at the time of detection of an abnormality is collected, water sampling at the time of the abnormality is analyzed, and the analysis / measurement result matches the automatic measurement value. For this reason, the reliability of whether or not the abnormality is the original abnormality of the water quality increases. By the way,
This is because the abnormality detection may be caused by a factor other than the water quality such as an abnormality of the device.
【００１０】[0010]
【発明の実施の形態】上記自動採水機能は、例えば、水
質自動監視装置の検水管から採水管を分岐し、この採水
管に開閉弁を介して採水槽を接続して構成し、上記水質
異常を検出したとき、前記開閉弁を開放して前記採水槽
に被検出管路の水を貯留する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The automatic water sampling function is constructed, for example, by branching a water sampling pipe from a water sampling pipe of an automatic water quality monitoring device, and connecting a water sampling tank to the water sampling pipe via an on-off valve. When an abnormality is detected, the on-off valve is opened to store the water in the pipe to be detected in the water sampling tank.
【００１１】上記採水管は上記採水槽の底部に開口し、
採水槽の上部から水がオーバーフローするようにすれ
ば、採水槽には底部から新水が供給され、古い溜水は徐
々に上昇してオーバーフローするため、その溜水が十分
に除かれる時間を考慮して、採水槽への給水を行えば、
異常時の検出水（採水）のみを確実に貯留し得る。[0011] The water sampling pipe is opened at the bottom of the water sampling tank,
If water is allowed to overflow from the top of the water tank, fresh water is supplied to the water tank from the bottom, and old stored water gradually rises and overflows. Then, if you supply water to the water collection tank,
Only the water detected at the time of abnormality (water sampling) can be reliably stored.
【００１２】[0012]
【実施例】図３、図４に、この発明の一実施例の詳細を
示すが、従来との相違点のみを主に説明すると、管路ａ
から分岐した検水管ｂに減圧弁１０を介設して、高圧か
ら所要の水圧に下げ、その圧の検水を水温計等の各種セ
ンサーに導いて各種の検出（測定）を行う。3 and 4 show the details of an embodiment of the present invention. Only the differences from the prior art will be mainly described.
A pressure reducing valve 10 is interposed in a water test pipe b branched from the above, the pressure is reduced from a high pressure to a required water pressure, and a water sample of the pressure is led to various sensors such as a water temperature gauge to perform various detections (measurements).
【００１３】減圧弁１０と各種センサーの接続管に分岐
管１１を設け、その分岐管１１へ電磁弁１２を介して流
入管１３の一端を接続し、他端は採水槽１４へ接続挿入
する。一方、オーバーフロー管１５は採水槽１４の上部
に接続し、他端は排水と同じ排水溝につながっている。
電磁弁１２は開閉信号により自動開閉し、通常時は、電
磁弁１２は全閉のため本管管路ａからの試料水は採水槽
１４には入ってこないので、上述の従来技術と同じ作用
となる。A branch pipe 11 is provided in a connection pipe between the pressure reducing valve 10 and various sensors. One end of an inflow pipe 13 is connected to the branch pipe 11 via an electromagnetic valve 12, and the other end is connected to a water collecting tank 14. On the other hand, the overflow pipe 15 is connected to the upper part of the water collecting tank 14, and the other end is connected to the same drain as the drain.
The solenoid valve 12 automatically opens and closes in response to an open / close signal. Normally, since the solenoid valve 12 is fully closed, the sample water from the main pipe line a does not enter the water collection tank 14, so that the same operation as the above-described prior art is performed. Becomes
【００１４】採水槽１４は、透明の合成樹脂製で、上部
に合成樹脂製の上蓋１６とねじ合せした構造を形成して
いる。合成樹脂製の流入管１３の一端は電磁弁１２の下
流側端に水密取り付けし、他端は上蓋１６を貫通し、そ
の先端は採水槽１４内の底部へ垂下している。本例では
底部と多少隙間があるように垂れ下がっているが、採水
槽１４の底部面上に流入管１３先端部があってもよく、
要は底部にあればよい。The water collecting tank 14 is made of a transparent synthetic resin, and has a structure in which an upper lid 16 made of a synthetic resin is screwed to an upper portion thereof. One end of the synthetic resin inflow pipe 13 is water-tightly attached to the downstream end of the solenoid valve 12, the other end penetrates the upper lid 16, and the tip thereof is hanging down to the bottom in the water collecting tank 14. In this example, it hangs down so that there is some gap with the bottom, but the tip of the inflow pipe 13 may be on the bottom surface of the water collection tank 14,
In short, it only has to be at the bottom.
【００１５】同じく合成樹脂製のオーバーフロー管１５
は採水槽１４の上面に設けられた貫通穴に、先端を挿入
接続し、他端は排水受け１７へ垂れ下がっている。排水
受け１７には別の排水管１８（ゴムホース）が接続して
あり、この管１８は排水溝へと通じている。An overflow pipe 15 also made of synthetic resin
Is connected to a through hole provided on the upper surface of the water collecting tank 14 at an end thereof, and the other end thereof hangs down to a drain receiver 17. The drain receiver 17 is connected to another drain pipe 18 (rubber hose), and this pipe 18 communicates with the drain.
【００１６】今、例えば試料水の測定データにおいて異
常値があった時、異常信号が出て、遠隔地の中央監視セ
ンタＣに自動通報するが、この異常信号を電磁弁１２を
開にする信号に連動させておくと、電磁弁１２が開とな
り、流入管１３が開口し、今までセンサーユニット部Ｕ
のみへ流入している試料水は、同時に電磁弁１２を経由
して採水槽１４にも流れ込む。満杯になればオーバーフ
ロー管１５よりあふれ出て排水溝へと排水される。満杯
にするための所要時間などの一定時間経過後、電磁弁１
２は再び閉状態にもどり、試料水の流入はなくなり、採
水槽１４には試料水が貯留された状態となる。万一、採
水槽１４に古い水が貯留されていても、流入管１３先端
が採水槽１４の底部に垂下しているので、新しい貯留水
は底部より流れ込み、古い貯留水は上部へと押上げられ
てオーバーフロー管１５より外部へ排出されてゆくの
で、採水槽１４には常に新しい試料水が貯留されること
になる。Now, for example, when there is an abnormal value in the measurement data of the sample water, an abnormal signal is output and automatically notified to a remote central monitoring center C. The abnormal signal is a signal for opening the solenoid valve 12. , The solenoid valve 12 is opened, the inflow pipe 13 is opened, and the sensor unit U
The sample water flowing into only the water sample flows into the water collecting tank 14 via the solenoid valve 12 at the same time. When it is full, it overflows from the overflow pipe 15 and is drained to a drain. After a certain period of time, such as the time required to fill, solenoid valve 1
2 returns to the closed state again, the inflow of the sample water stops, and the water sample tank 14 is in a state where the sample water is stored. Even if old water is stored in the water collection tank 14, since the tip of the inflow pipe 13 is hanging down to the bottom of the water collection tank 14, new storage water flows from the bottom and old storage water is pushed upward. Then, the water is discharged from the overflow pipe 15 to the outside, so that a new sample water is always stored in the water collecting tank 14.
【００１７】貯留後（採水後）、採水槽１４を空っぽの
新しい採水槽１４に取替えて持ち帰ったり、又は、採水
槽１４の貯留水のみを持ち帰りして、その持ち帰った貯
留水を測定する。このとき、異常があった時と同じ時間
に採水した貯留水であるから、その分析・測定は、セン
サーユニット部Ｕと同一内容の計測を実施したこととな
り、計測値に対する信頼性は高い。After storage (after water collection), the water collection tank 14 is replaced with an empty new water collection tank 14 and brought back, or only the water stored in the water collection tank 14 is brought back and the returned stored water is measured. At this time, since the stored water is sampled at the same time as the time when the abnormality occurred, the analysis and measurement thereof have been performed with the same measurement as the sensor unit U, and the reliability of the measured value is high.
【００１８】この採水ラインは、減圧弁１０と各センサ
ーとの接続配管の中間であれば分岐管１１および電磁弁
１２を介して幾つでも設けることができ、異常時のみ１
回だけでなく、幾通りかの任意時間でもよいし、幾つか
の計測項目に対してでもよい。種々のデータの計測が可
能になれば、信頼性が増す。また、電磁弁１２の開閉信
号は、異常時との連動だけでなく遠隔地の中央監視セン
タＣからの送信によっても自由に行うことができる。こ
のようにすれば、何時でも必要数の試料水を貯留（採
取）できる。電磁弁１２に代えて、電動ボール弁、電動
バタフライ弁等の各種の電動開閉弁を採用し得る。Any number of such water sampling lines can be provided via the branch pipe 11 and the solenoid valve 12 as long as they are located in the middle of the connection pipe between the pressure reducing valve 10 and each sensor.
Not only the number of times, but also any number of arbitrary times or for some measurement items. If the measurement of various data becomes possible, the reliability will increase. Further, the opening / closing signal of the solenoid valve 12 can be freely transmitted not only in conjunction with the time of abnormality but also by transmission from the central monitoring center C in a remote place. In this way, the required number of sample water can be stored (collected) at any time. Instead of the electromagnetic valve 12, various types of electric on-off valves such as an electric ball valve and an electric butterfly valve can be adopted.
【００１９】[0019]
【発明の効果】この発明は、異常時の試料水そのものを
採水槽内に確保するようにしたので、ゆっくりとその採
水を集めに行けばよく、従来のように、同じ時間の試料
水を採水するために、現場へ慌てて出かける必要がな
い。また、採水の確保は、データの再計測などが可能と
なり、自動計測データの確認ができ、また異常が試料水
か又は計測器等のいずれかかの発見も容易にできる。According to the present invention, since the sample water itself at the time of the abnormality is secured in the water collecting tank, it is only necessary to slowly collect the sample water. There is no need to rush to the site to collect water. In addition, in order to secure water collection, re-measurement of data and the like can be performed, automatic measurement data can be confirmed, and it can be easily found that the abnormality is either sample water or a measuring instrument.
【図１】水質モニターシステムの概略図FIG. 1 is a schematic diagram of a water quality monitoring system.
【図２】水質自動監視装置の設置概略図FIG. 2 is a schematic diagram of installation of an automatic water quality monitoring device.
【図３】一実施例の水質自動監視装置の配管図FIG. 3 is a piping diagram of an automatic water quality monitoring device according to one embodiment.
【図４】同実施例の採水部の斜視図FIG. 4 is a perspective view of a water sampling unit of the embodiment.
Ａ、Ａ1 、Ａ2 …… 水質自動監視装置 Ｃ 中央監視センタ Ｄ 測定制御部 Ｅ 伝送受信部 Ｕ センサーユニット部 ａ 本管管路 ｂ 検水管 １０ 減圧弁 １１ 分岐管 １２ 電磁弁 １３ 流入管 １４ 採水槽 １５ オーバーフロー管 １６ 上蓋 １７ 排水受け １８ 排水管A, A 1 , A 2 … Automatic water quality monitoring device C Central monitoring center D Measurement control unit E Transmission receiving unit U Sensor unit a Main pipe line b Water test pipe 10 Pressure reducing valve 11 Branch pipe 12 Electromagnetic valve 13 Inflow pipe 14 Sampling tank 15 Overflow pipe 16 Top lid 17 Drain receiver 18 Drain pipe
Claims (3)
動監視装置Ａから、その検出データを中央監視センタＣ
に伝送し、中央監視センタＣにおいて、その検出データ
に基づき、前記管路ａの水質をモニターするシステムに
おいて、 上記水質自動監視装置Ａに自動採水機能を付加し、管路
ａの水質異常を検出したとき、その自動採水機能によっ
て、その異常水を採取するようにした水質モニターシス
テム。1. An automatic water quality monitoring device A for a pipe a attached to the pipe a sends the detected data to a central monitoring center C.
In the system for monitoring the water quality of the pipe a based on the detection data at the central monitoring center C, an automatic water sampling function is added to the automatic water quality monitoring device A to detect the water quality abnormality of the pipe a. A water quality monitoring system that, when detected, uses the automatic water sampling function to collect the abnormal water.
採水管１１、１３を分岐し、この採水管に開閉弁１２を
介して採水槽１４を接続して、上記自動採水機能を構成
し、上記水質異常を検出したとき、前記開閉弁１２を開
放して前記採水槽１４に上記管路ａの水を貯留すること
を特徴とする請求項１記載の水質モニターシステム。2. The automatic water sampling function is configured by branching water sampling pipes 11 and 13 from a water sampling pipe b of the automatic water quality monitoring device A, and connecting a water sampling tank 14 to the water sampling pipe via an on-off valve 12. The water quality monitoring system according to claim 1, wherein, when the water quality abnormality is detected, the on-off valve (12) is opened to store the water in the pipe (a) in the water sampling tank (14).
に開口し、採水槽１４の上部から水がオーバーフローす
るようにした請求項２に記載の水質モニターシステム。3. The water quality monitoring system according to claim 2, wherein the water sampling pipe is opened at a bottom of the water sampling tank so that water overflows from an upper part of the water sampling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15853397A JP3208091B2 (en) | 1997-06-16 | 1997-06-16 | Water quality monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15853397A JP3208091B2 (en) | 1997-06-16 | 1997-06-16 | Water quality monitoring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH116826A true JPH116826A (en) | 1999-01-12 |
| JP3208091B2 JP3208091B2 (en) | 2001-09-10 |
Family
ID=15673813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15853397A Expired - Fee Related JP3208091B2 (en) | 1997-06-16 | 1997-06-16 | Water quality monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3208091B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009192340A (en) * | 2008-02-14 | 2009-08-27 | Dkk Toa Corp | Water quality measuring apparatus |
| CN102998148A (en) * | 2012-12-31 | 2013-03-27 | 北京师范大学 | Soil water automatic sampling and monitoring method |
| KR101704277B1 (en) * | 2015-11-04 | 2017-02-22 | 세종대학교산학협력단 | Automatic waterworks quality monitoring system |
| CN107381665A (en) * | 2017-07-20 | 2017-11-24 | 梧州井儿铺贸易有限公司 | A kind of drinking water safety intelligent monitor system |
| CN108051559A (en) * | 2017-12-13 | 2018-05-18 | 山东星火科学技术研究院 | Wastewater from chemical industry on-line monitoring system |
| CN109163936A (en) * | 2018-10-10 | 2019-01-08 | 青岛良研信息科技有限公司 | A kind of water quality detection multifunction automatic sample detection device |
| CN109507753A (en) * | 2018-11-08 | 2019-03-22 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | A kind of digital control type Full-automatic water surface evaporation real-time monitoring device |
| JP2021060314A (en) * | 2019-10-08 | 2021-04-15 | 栗田工業株式会社 | Water sampler for water quality measurement |
| JP2021060363A (en) * | 2019-10-09 | 2021-04-15 | 昭和電工マテリアルズ株式会社 | Water quality monitoring system |
-
1997
- 1997-06-16 JP JP15853397A patent/JP3208091B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009192340A (en) * | 2008-02-14 | 2009-08-27 | Dkk Toa Corp | Water quality measuring apparatus |
| CN102998148A (en) * | 2012-12-31 | 2013-03-27 | 北京师范大学 | Soil water automatic sampling and monitoring method |
| CN102998148B (en) * | 2012-12-31 | 2014-12-31 | 北京师范大学 | Soil water automatic sampling and monitoring method |
| KR101704277B1 (en) * | 2015-11-04 | 2017-02-22 | 세종대학교산학협력단 | Automatic waterworks quality monitoring system |
| CN107381665A (en) * | 2017-07-20 | 2017-11-24 | 梧州井儿铺贸易有限公司 | A kind of drinking water safety intelligent monitor system |
| CN108051559A (en) * | 2017-12-13 | 2018-05-18 | 山东星火科学技术研究院 | Wastewater from chemical industry on-line monitoring system |
| CN109163936A (en) * | 2018-10-10 | 2019-01-08 | 青岛良研信息科技有限公司 | A kind of water quality detection multifunction automatic sample detection device |
| CN109163936B (en) * | 2018-10-10 | 2020-12-08 | 山东博派生物科技有限公司 | Water quality testing is with multi-functional automatic sampling device |
| CN109507753A (en) * | 2018-11-08 | 2019-03-22 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | A kind of digital control type Full-automatic water surface evaporation real-time monitoring device |
| JP2021060314A (en) * | 2019-10-08 | 2021-04-15 | 栗田工業株式会社 | Water sampler for water quality measurement |
| WO2021070524A1 (en) * | 2019-10-08 | 2021-04-15 | 栗田工業株式会社 | Water sampling device for water quality measurement |
| KR20220078556A (en) | 2019-10-08 | 2022-06-10 | 쿠리타 고교 가부시키가이샤 | Water collection device for measuring water quality |
| TWI826725B (en) * | 2019-10-08 | 2023-12-21 | 日商栗田工業股份有限公司 | Water collection device for water quality measurement |
| JP2021060363A (en) * | 2019-10-09 | 2021-04-15 | 昭和電工マテリアルズ株式会社 | Water quality monitoring system |
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| JP3208091B2 (en) | 2001-09-10 |
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