JP2004333280A - Concentration-measuring device - Google Patents

Concentration-measuring device Download PDF

Info

Publication number
JP2004333280A
JP2004333280A JP2003129275A JP2003129275A JP2004333280A JP 2004333280 A JP2004333280 A JP 2004333280A JP 2003129275 A JP2003129275 A JP 2003129275A JP 2003129275 A JP2003129275 A JP 2003129275A JP 2004333280 A JP2004333280 A JP 2004333280A
Authority
JP
Japan
Prior art keywords
polarographic
electric conductivity
concentration
measuring device
residual chlorine
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
Application number
JP2003129275A
Other languages
Japanese (ja)
Other versions
JP4030458B2 (en
Inventor
Mitsutoshi Sano
光俊 佐野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2003129275A priority Critical patent/JP4030458B2/en
Publication of JP2004333280A publication Critical patent/JP2004333280A/en
Application granted granted Critical
Publication of JP4030458B2 publication Critical patent/JP4030458B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concentration-measuring device using a polarographic method, capable of measuring the concentration of a substance in a liquid to be inspected relatively accurately, even if seawater is mixed with the liquid to be inspected. <P>SOLUTION: The concentration-measuring device is equipped with a polarographic detector 2, an electrical conductivity measuring device 3, an electrical conductivity correction device 4, a residual chlorine indicator 5 and a polarograph changing device 6. The polarographic characteristics directly detected by the polarographic detector 2 are compared with the polarographic characteristics which takes into consideration the electroconductivity corrected by the electrical conductivity correction device 4 in the polarographic changing device 6 which is changed to accurate polarographic characteristics, as necessary, while the result is fed back and inputted to the residual chlorine indicator 5. A residual chlorine indication value is redetermined, on the basis of the altered polarographic characteristics in the residual chlorine indicator 5, to display an accurate residual chlorine indication value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、濃度測定装置に関し、詳しくはポーラログラフ検知装置を用いたものであって残留塩素濃度の測定に好適な濃度測定装置に関するものである。
【０００２】
【従来の技術】
下水が溜められた調整池の水位は、大雨などの際には雨水の流入により上昇して溢流することがあるので、下水は、次亜塩素酸で消毒され且つ次亜塩素酸の使用に基づく残留塩素濃度が測定され、それが基準値の範囲内であることが確認された後に放流される。
【０００３】
残留塩素濃度の測定方法としては、後記の許文献１に記載されているように、ｏ−トリジンにより発色させて吸光度測定により測定する方法、試料水に沃化カリウムや臭化カリウムを含む溶液を加え、遊離した沃素や臭素を回転金属電極を用いたポーラログラフ法により測定する方法、あるいは試料水に試薬を加えることなく、当該試料水を対象として回転金属電極を用いてポーラログラフ法により測定する方法、などが知られている。
【０００４】
これらのうち、ｏ−トリジンを用いる方法は、それが発ガン物質であるために次第に利用されなくなっており、現在では、上記ポーラログラフ法による方法が、就中、試薬を加えない方法が試薬を加えないことによる種々の利点から広く採用されている。しかし、試薬を加えない方法では、試料水が或る程度以上の導電率を有していないと正確な塩素濃度の測定ができないことから、試料水の導電率を高めるために極く少量の海水を当該試料水に添加することも公知である。
【０００５】
【特許文献１】
特公平２−２００６２号公報（第１３１頁〜第１３２頁、図１〜図２）
【０００６】
ところで、上記の調整池が海岸の近傍に設けられている場合には、調整池内に多量の海水がしばしば流入する。流入海水量が極く少量の場合には、試料水中における海水の存在は、ポーラログラフ法による残留塩素濃度の測定上に実質的に支障を来たさないことが前記特許文献１から知られているが、上記調整池の場合での海水の流入量は、一般的に多量であり、しかも時によってまちまちである。一方、海水の流入量が多量であると、試料水に含まれている残留塩素量に固有のポーラログラフ特性が海水の大きな導電率のために変化して、上記ポーラログラフ法による残留塩素濃度の測定値に誤差が生じる問題がある。
【０００７】
【発明が解決しようとする課題】
本発明は、斯界における如上の問題に鑑みて、海水の流入量が多量であっても、被検査液体に含まれる物質の濃度を比較的正確に測定可能な、ポーラログラフ法を利用した濃度測定装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明の請求項１に係る濃度測定装置は、被検査液体に含まれている濃度測定対象物質のポーラログラフ特性を検知するポーラログラフ検知装置、上記被検査液体の電気伝導度を測定する電気伝導度測定装置、上記電気伝導度測定装置により測定された電気伝導度に基づいて上記ポーラログラフ特性を変更するポーラログラフ変更装置、変更されたポーラログラフ特性から上記濃度測定対象物質の濃度を出力する濃度出力装置を備えたことを特徴とするものである。
【０００９】
【発明の実施の形態】
実施の形態１．
図１〜図３は、本発明における濃度測定装置の一例としての残留塩素濃度測定装置に就いての実施の形態１を説明するものであって、図１は、当該残留塩素濃度測定装置の構成図、図２は残留塩素濃度と残留塩素指示値との関係を示すグラフ、図３は被検査液体の電気伝導度をパラメータとしたポーラログラフ特性を示すグラフである。図１において、実施の形態１の残留塩素濃度測定装置は、その主要部として、サンプリングポンプ１、ポーラログラフ検知装置２、電気伝導度測定装置３、電気伝導度補正装置４、残留塩素量指示装置５、ポーラログラフ変更装置６、管路系７、および信号伝達線路系８を備えている。
【００１０】
ポーラログラフ検知装置２は、ポーラログラフ検知槽２１、回転測定電極２２、モータ２３、検知極２４、および対極２５を備えており、被検査液体を対象としてポーラログラフ特性を検知すると共に、かく検知したポーラログラフ特性を残留塩素量指示装置５に入力する機能をなす。電気伝導度測定装置３は、電気伝導度測定槽３１、電気伝導度検出器３２、および温度計（サーミスタなど）３３を備えており、上記被検査液体の電気伝導度並びに当該電気伝導度が測定された時の上記被検査液体の温度を測定する機能をなす。
【００１１】
電気伝導度補正装置４は、電気伝導度測定装置３から入力された電気伝導度測定値と測定温度の情報に基づいて被検査液体の標準温度（例えば２０℃）における電気伝導度に補正し、かく補正された電気伝導度をポーラログラフ変更装置５に入力する機能をなす。残留塩素量指示装置５は、ポーラログラフ検知装置２にて検知されたポーラログラフ特性に基づいて、あるいはポーラログラフ変更装置６により後記するように変更されたポーラログラフ特性に基づいて残留塩素濃度を決定し、かく決定された残留塩素濃度を図２に示すように残留塩素指示値に変換して出力する機能をなす。
【００１２】
ポーラログラフ変更装置６の機能を説明する前に、図３に就いて説明する。上記被検査液体における残留塩素のポーラログラフ特性は、被検査液体の電気伝導度により変化することが知られている。図３において、グラフＧ１、グラフＧ２、グラフＧ３、およびグラフＧ４は、それぞれ規準温度での電気伝導度が２０００μＳ／ｍ以上、２００〜２０００μＳ／ｍ未満、５０〜２００μＳ／ｍ未満、および５０μＳ／ｍ未満の場合のポーラログラフ特性である。しかしてポーラログラフ変更装置６には、図３に示すような電気伝導度とポーラログラフ特性との関係データが予め入力されており、被検査液体の電気伝導度に対応するポーラログラフ特性を選定あるいは変更して、変更されたポーラログラフ特性を残留塩素量指示装置５にフィードバックする機能をなす。残留塩素量指示装置５は、変更されたポーラログラフ特性に基づいて残留塩素指示値を算出すると共に、それを電流信号に変換して出力する。
【００１３】
管路系７は、管路７１〜管路７５、並びに管路７１に設けられた二方開閉弁７６、管路７４に設けられた二方開閉弁７７、管路７５に設けられた二方開閉弁７８、管路７１が管路管路７２と管路７３に分岐する分岐部に設けられた三方開閉弁７９から構成されている。信号伝達線路系８は、ポーラログラフ検知装置２（検知極２４および対極２５）と残留塩素量指示装置５とを結ぶ信号伝達線路８１、電気伝導度測定装置３（電気伝導度検出器３２および温度計３３）と電気伝導度補正装置４とを結ぶ信号伝達線路８２、電気伝導度補正装置４とポーラログラフ変更装置６とを結ぶ信号伝達線路８３、およびポーラログラフ変更装置６と残留塩素量指示装置５とを結ぶ信号伝達線路８４から構成されている。
【００１４】
つぎに実施の形態１の残留塩素濃度測定装置の動作について説明する。二方開閉弁７６が開かれ、二方開閉弁７７と二方開閉弁７８が閉ざされ、また三方開閉弁７９が管路７１、管路７２および管路７３に開くように操作されて、且つサンプリングポンプ１が駆動されて、被検査液体、例えば前記調整池に溜められて流入海水を含む下水は、管路７１から管路７２および管路７３を経由してポーラログラフ検知槽２１と電気伝導度測定槽３１とに同時に供給され、ポーラログラフ検知槽２１内と電気伝導度測定槽３１内の水位が充分となった時点で二方開閉弁７７と二方開閉弁７８を適度に開いて、被検査液体が適度の流速で絶えずポーラログラフ検知槽２１内と電気伝導度測定槽３１内とに流入し流出する状態として、ポーラログラフ検知装置２にて被検査液体に就いてポーラログラフ特性が検知され、それは信号伝達線路８１を介して残留塩素量指示装置５に入力される。一方、電気伝導度測定装置３にて被検査液体の電気伝導度と温度とが測定され、それらのデータは、信号伝達線路８２を介して電気伝導度補正装置４に入力される。電気伝導度補正装置４では、電気伝導度測定装置３での測定データが規準温度での電気伝導度に補正され、補正された電気伝導度は、信号伝達線路８３を介してポーラログラフ変更装置６に入力される。
【００１５】
ポーラログラフ変更装置６においては、ポーラログラフ検知装置２において直接検知されたポーラログラフ特性と電気伝導度を考慮したポーラログラフ特性とが対比され、必要に応じて正しいポーラログラフ特性に変更され、その結果が残留塩素量指示装置５にフィードバック入力される。例えば、かなりの量の海水が流入したと思われる或る残留塩素含有被検査水に就いてのポーラログラフ検知装置２において直接検知されたポーラログラフ特性が図３に示されたグラフＧ１またはそれに近いポーラログラフ特性であり、電気伝導度測定装置３で測定され且つ電気伝導度補正装置４で補正された電気伝導度が、２５００μＳ／ｍであったとする。一方、上記残留塩素含有被検査水の海水流入のない状態でのポーラログラフ特性が図３に示されたグラフＧ３またはそれに近いポーラログラフ特性であるとすると、ポーラログラフ検知装置２において直接検知された上記の実測ポーラログラフ特性は、ポーラログラフ変更装置６においてグラフＧ３に変更される。また残留塩素量指示装置５においては、ポーラログラフ変更装置６において変更されたポーラログラフ特性、即ちグラフＧ３に基づいて残留塩素指示値が再決定され、正しい残留塩素指示値が表示される。
【００１６】
実施の形態２．
図４〜図６は、本発明における濃度測定装置の他の例としての残留塩素濃度測定装置に就いての実施の形態２を説明するものであって、図４は、当該残留塩素濃度測定装置の構成図、図５は警報設定値と電気伝導度との関係を示すグラフ、図６は被検査液体の電気伝導度をパラメータとしたポーラログラフ特性である。
【００１７】
図４において、実施の形態２の残留塩素濃度測定装置は、実施の形態１の残留塩素濃度測定装置と同様に、その主要部として、サンプリングポンプ１、ポーラログラフ検知装置２、電気伝導度測定装置３、電気伝導度補正装置４、残留塩素量指示装置５、ポーラログラフ変更装置６、管路系７、および信号伝達線路系８を備え、それらの他にポーラログラフ変更装置６は、上記被検査液体の電気伝導度を判定する電気伝導度判定部６１を備えており、電気伝導度判定部６１は、電気伝導度測定装置３または電気伝導度補正装置４から入力する上記被検査液体の電気伝導度が予め設定された規準値（警報設定値、図５では２０００μＳ／ｍ）以上であるか、あるいは上記規準値未満であるかを判別してポーラログラフ変更装置６に含まれているポーラログラフ変更部に入力する。
【００１８】
実施の形態１におけるポーラログラフ変更装置６は、前記図３に示す通りの多数のポーラログラフ特性を内蔵し、それらのうちから適切なポーラログラフ特性が選定されたが、実施の形態２におけるポーラログラフ変更装置６は、図６に示す通りの二つのポーラログラフ特性、即ち前記した第一ポーラログラフ特性の一例としてのグラフＧ５（電気伝導度；例えば２０００μＳ／ｍ以上）と前記した第二ポーラログラフ特性の一例としてのグラフＧ６（電気伝導度；例えば５０〜２０００μＳ／ｍ未満）を内蔵しているに過ぎない。
【００１９】
よって実施の形態２におけるポーラログラフ変更装置６に含まれているポーラログラフ変更部は、グラフＧ５またはグラフＧ６のいずれかを選定する。ポーラログラフ変更装置６において選定対象となるポーラログラフ特性が僅か２種であっても、高残留塩素量の検出が可能であるので、高残留塩素量を含む上記被検査液体の検出が可能であり、しかもポーラログラフ変更装置６も簡素化されるのでコストダウンも可能となる。
【００２０】
実施の形態３．
図７および図８は、本発明における濃度測定装置のさらに他の例としての残留塩素濃度測定装置に就いての実施の形態３を説明するものであって、図７は、当該残留塩素濃度測定装置の構成図、図８は警報設定値と電気伝導度との関係を示すグラフである。
【００２１】
図７において、実施の形態３の塩素濃度測定装置は、実施の形態１の残留塩素濃度測定装置と同様に、その主要部として、サンプリングポンプ１、ポーラログラフ検知装置２、電気伝導度測定装置３、電気伝導度補正装置４、残留塩素量指示装置５、ポーラログラフ変更装置６、管路系７、および信号伝達線路系８を備え、それらの他にポーラログラフ変更装置６は、上記被検査液体の電気伝導度の時間的変化率を判定する変化率判定部６２を備えており、変化率判定部６２は、電気伝導度測定装置３または電気伝導度補正装置４から入力する上記被検査液体の電気伝導度の時間的変化率（ΔｍＳ／ｍ）が予め設定された規準変化率（警報設定値）以上であるか、あるいは上記規準変化率未満であるかを判別してポーラログラフ変更装置６に含まれているポーラログラフ変更部に入力する。
【００２２】
実施の形態３におけるポーラログラフ変更装置６は、上記規準変化率以上である場合には、例えば前記した第三ポーラログラフ特性の一例としての前記図６のグラフＧ５（電気伝導度；例えば２０００μＳ／ｍ以上）を選定し、上記規準変化率未満である場合には、例えば前記した第四ポーラログラフ特性の一例としての前記図６のグラフＧ６（電気伝導度；例えば５０〜２０００μＳ／ｍ未満）を選定する。よってポーラログラフ変更装置６において選定対象となるポーラログラフ特性が僅か２種であっても、上記被検査液体の電気伝導度が時間的に急上昇していることの検出が可能であるので、かかる被検査液体の検出が可能であり、しかもポーラログラフ変更装置６のコストダウンも可能となる。
【００２３】
以上、本発明の濃度測定装置に就いて実施の形態１〜実施の形態３により詳述したが、本発明はそれらの実施の形態に限定されるものではなく、本発明の前記課題と解決手段の精神に則った種々の変形実施形態を包含する。またさらに実施の形態１〜実施の形態３では被検査液体に含まれている濃度測定対象物質として残留塩素を取り上げたが、それ以外の種々の物質を濃度測定の対象とするすることができる。
【００２４】
【発明の効果】
本発明の濃度測定装置は、以上説明した通り、被検査液体に含まれている濃度測定対象物質のポーラログラフ特性を検知するポーラログラフ検知装置、上記被検査液体の電気伝導度を測定する電気伝導度測定装置、上記電気伝導度測定装置により測定された電気伝導度に基づいて上記ポーラログラフ特性を変更するポーラログラフ変更装置、変更されたポーラログラフ特性から上記濃度測定対象物質の濃度を出力する濃度出力装置を備えたことを特徴とするものであって、ポーラログラフ変更装置においては、ポーラログラフ検知装置において直接検知されたポーラログラフ特性と電気伝導度を考慮したポーラログラフ特性とが対比され、必要に応じて正しいポーラログラフ特性に変更され、その結果が濃度出力装置のフィードバック入力されるので、被検査液体に海水などが多量に混入しても、被検査液体における濃度測定対象物質の正しい濃度の測定が可能となる。
【図面の簡単な説明】
【図１】実施の形態１の残留塩素濃度測定装置の構成図。
【図２】実施の形態１で用いられる残留塩素濃度と残留塩素指示値との関係を示すグラフ。
【図３】実施の形態１で用いられる被検査液体の電気伝導度をパラメータとしたポーラログラフ特性のグラフ。
【図４】実施の形態２の残留塩素濃度測定装置の構成図。
【図５】実施の形態２で用いられる警報設定値と電気伝導度との関係を示すグラフ。
【図６】実施の形態２で用いられる被検査液体の電気伝導度をパラメータとしたポーラログラフ特性のグラフ。
【図７】実施の形態３の残留塩素濃度測定装置の構成図。
【図８】実施の形態３で用いられる警報設定値と電気伝導度との関係を示すグラフ。
【符号の説明】
１ サンプリングポンプ、２ ポーラログラフ検知装置、
２１ ポーラログラフ検知槽、２２ 回転測定電極、２３ モータ、
２４ 検知極、２５ 対極、３ 電気伝導度測定装置、
３１ 電気伝導度測定槽、３２ 電気伝導度検出器、３３ 温度計、
４ 電気伝導度補正装置、５ 残留塩素量指示装置、
６ ポーラログラフ変更装置、６１ 電気伝導度判定部、６２ 変化率判定部、
７ 管路系、７１〜７５ 管路、７６ 二方開閉弁、７７ 二方開閉弁、
７８ 二方開閉弁、７９ 三方開閉弁、８ 信号伝達線路系、
８１〜８４ 信号伝達線路。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concentration measuring device, and more particularly to a concentration measuring device using a polarographic detecting device and suitable for measuring a residual chlorine concentration.
[0002]
[Prior art]
The water level of the regulating pond where the sewage is stored may rise due to the inflow of rainwater and overflow during heavy rains, so the sewage is disinfected with hypochlorous acid and used for hypochlorous acid. After measuring the residual chlorine concentration based on the measured value, it is confirmed that the concentration is within the range of the reference value, and then discharged.
[0003]
As a method for measuring the residual chlorine concentration, as described in Patent Document 1 below, a method of coloring by o-tolidine and measuring by absorbance measurement, a solution containing potassium iodide or potassium bromide in a sample water is used. In addition, a method of measuring free iodine or bromine by a polarographic method using a rotating metal electrode, or a method of measuring a polarographic method using a rotating metal electrode on the sample water without adding a reagent to the sample water, Etc. are known.
[0004]
Of these, the method using o-tolidine has gradually become unavailable because it is a carcinogen. At present, the above-mentioned polarographic method is, among others, a method in which a reagent is not added, and a method in which a reagent is not added. It is widely adopted because of its various advantages. However, in the method without adding a reagent, accurate chlorine concentration measurement cannot be performed unless the sample water has a certain level of conductivity. Is also known to be added to the sample water.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 2-20062 (pp. 131-132, FIGS. 1-2)
[0006]
By the way, when the regulating pond is provided near the coast, a large amount of seawater often flows into the regulating pond. It is known from Patent Document 1 that when the inflowing seawater amount is extremely small, the presence of seawater in the sample water does not substantially hinder the measurement of the residual chlorine concentration by the polarographic method. However, the inflow of seawater in the case of the above-mentioned regulating pond is generally large and varies from time to time. On the other hand, when the inflow of seawater is large, the polarographic characteristics inherent in the amount of residual chlorine contained in the sample water change due to the large conductivity of seawater, and the measured value of the residual chlorine concentration by the polarographic method described above. There is a problem that an error occurs.
[0007]
[Problems to be solved by the invention]
In view of the above problems in the art, the present invention provides a concentration measuring apparatus using a polarographic method, which can relatively accurately measure the concentration of a substance contained in a test liquid even when the inflow of seawater is large. The purpose is to provide.
[0008]
[Means for Solving the Problems]
A concentration measuring device according to claim 1 of the present invention is a polarographic detecting device for detecting polarographic characteristics of a substance to be measured for concentration contained in a test liquid, and an electric conductivity measurement for measuring electric conductivity of the test liquid. An apparatus, a polarographic change device that changes the polarographic characteristics based on the electric conductivity measured by the electric conductivity measuring device, and a concentration output device that outputs the concentration of the concentration measurement target substance from the changed polarographic characteristics. It is characterized by the following.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
1 to 3 illustrate a first embodiment of a residual chlorine concentration measuring device as an example of a concentration measuring device according to the present invention. FIG. 1 illustrates a configuration of the residual chlorine concentration measuring device. FIG. 2 is a graph showing the relationship between the residual chlorine concentration and the residual chlorine indication value, and FIG. 3 is a graph showing polarographic characteristics using the electric conductivity of the test liquid as a parameter. In FIG. 1, the main components of the residual chlorine concentration measuring device of the first embodiment are a sampling pump 1, a polarographic detecting device 2, an electric conductivity measuring device 3, an electric conductivity correcting device 4, a residual chlorine amount indicating device 5, , A polarographic change device 6, a pipeline system 7, and a signal transmission line system 8.
[0010]
The polarographic detecting device 2 includes a polarographic detecting tank 21, a rotation measuring electrode 22, a motor 23, a detecting electrode 24, and a counter electrode 25, and detects polarographic characteristics of a liquid to be inspected, and detects the polarographic characteristics thus detected. The function of inputting to the residual chlorine amount indicating device 5 is provided. The electric conductivity measuring device 3 includes an electric conductivity measuring tank 31, an electric conductivity detector 32, and a thermometer (such as a thermistor) 33, and measures the electric conductivity of the liquid to be inspected and the electric conductivity. It has a function of measuring the temperature of the liquid to be inspected at the time of the measurement.
[0011]
The electrical conductivity correction device 4 corrects the electrical conductivity at a standard temperature (for example, 20 ° C.) of the test liquid based on the electrical conductivity measurement value and the information on the measurement temperature input from the electrical conductivity measurement device 3, The function of inputting the corrected electrical conductivity to the polarographic change device 5 is provided. The residual chlorine amount indicating device 5 determines and determines the residual chlorine concentration based on the polarographic characteristics detected by the polarographic detecting device 2 or based on the polarographic characteristics changed as described later by the polarographic changing device 6. The function of converting the obtained residual chlorine concentration into a residual chlorine indication value as shown in FIG.
[0012]
Before describing the function of the polarographic change device 6, FIG. 3 will be described. It is known that the polarographic characteristic of the residual chlorine in the liquid to be inspected changes depending on the electric conductivity of the liquid to be inspected. In FIG. 3, the graph G1, the graph G2, the graph G3, and the graph G4 show that the electrical conductivity at the reference temperature is 2000 μS / m or more, 200 to 2000 μS / m, 50 to 200 μS / m, and 50 μS / m, respectively. 9 is a polarographic characteristic in the case of less than. The polarographic change device 6 is preliminarily input with the relationship data between the electrical conductivity and the polarographic characteristics as shown in FIG. 3, and selects or changes the polarographic characteristics corresponding to the electrical conductivity of the test liquid. The function of feeding back the changed polarographic characteristics to the residual chlorine amount indicating device 5 is provided. The residual chlorine amount indicating device 5 calculates the residual chlorine indication value based on the changed polarographic characteristics, converts the value into a current signal, and outputs the current signal.
[0013]
The pipeline system 7 includes a pipeline 71 to a pipeline 75, a two-way on-off valve 76 provided in the pipeline 71, a two-way on-off valve 77 provided in the pipeline 74, and a two-way provided in the pipeline 75. An on-off valve 78 and a three-way on-off valve 79 provided at a branch where the pipeline 71 branches into a pipeline 72 and a pipeline 73. The signal transmission line system 8 includes a signal transmission line 81 connecting the polarographic detector 2 (the detection electrode 24 and the counter electrode 25) and the residual chlorine amount indicating device 5, and the electric conductivity measuring device 3 (the electric conductivity detector 32 and the thermometer). 33), a signal transmission line 82 connecting the electric conductivity correction device 4, a signal transmission line 83 connecting the electric conductivity correction device 4 and the polarographic change device 6, and a polarographic change device 6 and the residual chlorine amount indicating device 5. It comprises a signal transmission line 84 to be connected.
[0014]
Next, the operation of the residual chlorine concentration measuring apparatus according to the first embodiment will be described. The two-way on-off valve 76 is opened, the two-way on-off valve 77 and the two-way on-off valve 78 are closed, and the three-way on-off valve 79 is operated to open to the pipeline 71, the pipeline 72 and the pipeline 73, and When the sampling pump 1 is driven, the liquid to be inspected, for example, the sewage stored in the regulating pond and containing the inflowing seawater, flows from the pipe 71 through the pipe 72 and the pipe 73 to the polarographic detection tank 21 and the electric conductivity. The two-way on-off valve 77 and the two-way on-off valve 78 are appropriately opened when the water level in the polarographic detection tank 21 and the electric conductivity measurement tank 31 becomes sufficient at the same time when the water is supplied to the measurement tank 31 and the inspection is performed. In a state where the liquid continuously flows into and out of the polarographic detection tank 21 and the electric conductivity measurement tank 31 at an appropriate flow rate, the polarographic characteristics of the liquid to be inspected are detected by the polarographic detecting device 2. Through No. transmission line 81 is input to the residual chlorine amount indicating device 5. On the other hand, the electric conductivity measuring device 3 measures the electric conductivity and the temperature of the liquid to be inspected, and those data are input to the electric conductivity correcting device 4 via the signal transmission line 82. In the electric conductivity correction device 4, the data measured by the electric conductivity measurement device 3 is corrected to the electric conductivity at the reference temperature, and the corrected electric conductivity is sent to the polarographic change device 6 via the signal transmission line 83. Is entered.
[0015]
In the polarographic change device 6, the polarographic characteristics directly detected by the polarographic detecting device 2 are compared with the polarographic characteristics in consideration of the electric conductivity, and if necessary, the polarographic characteristics are changed to the correct polarographic characteristics. Feedback is input to the device 5. For example, the polarographic characteristics directly detected by the polarographic detection device 2 for a certain residual chlorine-containing test water which seems to have flowed in a considerable amount of seawater are the polarographic characteristics shown in FIG. It is assumed that the electric conductivity measured by the electric conductivity measuring device 3 and corrected by the electric conductivity correcting device 4 is 2500 μS / m. On the other hand, assuming that the polarographic characteristic in the state where the residual chlorine-containing test water does not flow into the seawater is the graph G3 shown in FIG. 3 or a polarographic characteristic close thereto, the above-described actual measurement directly detected by the polarographic detecting device 2 The polarographic characteristics are changed to a graph G3 by the polarographic changing device 6. In the residual chlorine amount indicating device 5, the residual chlorine indication value is re-determined based on the polarographic characteristics changed by the polarographic change device 6, that is, the graph G3, and the correct residual chlorine indication value is displayed.
[0016]
Embodiment 2 FIG.
4 to 6 illustrate a second embodiment of a residual chlorine concentration measuring device as another example of the concentration measuring device according to the present invention. FIG. 4 illustrates the residual chlorine concentration measuring device. FIG. 5 is a graph showing the relationship between the alarm set value and the electric conductivity, and FIG. 6 is a polarographic characteristic using the electric conductivity of the test liquid as a parameter.
[0017]
In FIG. 4, the residual chlorine concentration measuring device according to the second embodiment includes a sampling pump 1, a polarographic detecting device 2, and an electric conductivity measuring device 3 as its main parts, similarly to the residual chlorine concentration measuring device according to the first embodiment. , An electric conductivity correction device 4, a residual chlorine amount indicating device 5, a polarographic change device 6, a pipeline system 7, and a signal transmission line system 8, and in addition to these, the polarographic change device 6 An electrical conductivity determination unit 61 for determining conductivity is provided. The electrical conductivity determination unit 61 determines in advance that the electrical conductivity of the test liquid input from the electrical conductivity measuring device 3 or the electrical conductivity correction device 4 is predetermined. It is determined whether the value is equal to or greater than a set reference value (alarm set value, 2000 μS / m in FIG. 5) or less than the reference value, and is included in the polarographic change device 6. Input to Rarogurafu change unit.
[0018]
The polarographic change device 6 according to the first embodiment incorporates a number of polarographic characteristics as shown in FIG. 3, and an appropriate polarographic characteristic is selected from them. However, the polarographic change device 6 according to the second embodiment has 6, two polarographic characteristics as shown in FIG. 6, namely, a graph G5 (an electric conductivity; for example, 2000 μS / m or more) as an example of the first polarographic characteristic and a graph G6 (an example of the second polarographic characteristic). Electric conductivity; for example, less than 50 to 2000 μS / m).
[0019]
Therefore, the polarographic change unit included in polarographic change device 6 according to the second embodiment selects either graph G5 or graph G6. Even when the polarographic characteristics to be selected in the polarographic change device 6 are only two types, the high residual chlorine amount can be detected, so that the liquid to be inspected including the high residual chlorine amount can be detected. Since the polarographic change device 6 is also simplified, the cost can be reduced.
[0020]
Embodiment 3 FIG.
7 and 8 illustrate a third embodiment of a residual chlorine concentration measuring device as still another example of the concentration measuring device according to the present invention. FIG. 7 illustrates the residual chlorine concentration measuring device. FIG. 8 is a graph showing the relationship between the alarm set value and the electric conductivity.
[0021]
In FIG. 7, the chlorine concentration measuring device according to the third embodiment has a sampling pump 1, a polarographic detecting device 2, an electric conductivity measuring device 3, as its main parts, similarly to the residual chlorine concentration measuring device according to the first embodiment. An electrical conductivity correction device 4, a residual chlorine amount indicating device 5, a polarographic change device 6, a pipeline system 7, and a signal transmission line system 8 are provided. A change rate judging section 62 for judging a temporal change rate of the degree. It is determined whether the temporal change rate (ΔmS / m) is equal to or greater than a preset reference change rate (alarm set value) or less than the reference change rate. Rare is input to the polarographic changing unit is.
[0022]
When the polarographic change device 6 in the third embodiment is equal to or higher than the reference change rate, for example, the graph G5 in FIG. 6 (an example of the third polarographic characteristic described above) (electric conductivity; for example, 2000 μS / m or more) If the rate of change is less than the reference change rate, for example, the graph G6 (electric conductivity; for example, less than 50 to 2000 μS / m) in FIG. 6 as an example of the fourth polarographic characteristic described above is selected. Therefore, even if there are only two types of polarographic characteristics to be selected in the polarographic change device 6, since it is possible to detect that the electrical conductivity of the liquid to be inspected has risen temporally rapidly, the liquid to be inspected can be detected. Can be detected, and the cost of the polarographic change device 6 can be reduced.
[0023]
As described above, the concentration measuring apparatus of the present invention has been described in detail in the first to third embodiments. However, the present invention is not limited to these embodiments, and the problems and the solution of the present invention. Various modifications in accordance with the spirit of the present invention are included. Further, in the first to third embodiments, the residual chlorine is taken up as the concentration measurement target substance contained in the liquid to be inspected, but various other substances can be subjected to the concentration measurement.
[0024]
【The invention's effect】
As described above, the concentration measurement device of the present invention is a polarographic detection device that detects polarographic characteristics of a concentration measurement target substance contained in a test liquid, and an electric conductivity measurement that measures the electric conductivity of the test liquid. An apparatus, a polarographic change device that changes the polarographic characteristics based on the electric conductivity measured by the electric conductivity measuring device, and a concentration output device that outputs the concentration of the concentration measurement target substance from the changed polarographic characteristics. In the polarographic changing device, the polarographic characteristics directly detected by the polarographic detecting device and the polarographic characteristics in consideration of the electric conductivity are compared, and if necessary, the polarographic characteristics are changed to the correct polarographic characteristics. The result is fed back to the concentration output device. Runode, be mixed such that a large amount seawater inspected liquid, it is possible to measure the correct density of the density measurement target substance in the sample liquid.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a residual chlorine concentration measuring device according to a first embodiment.
FIG. 2 is a graph showing a relationship between a residual chlorine concentration and a residual chlorine indication value used in the first embodiment.
FIG. 3 is a graph of polarographic characteristics using the electric conductivity of a liquid to be inspected used in the first embodiment as a parameter.
FIG. 4 is a configuration diagram of a residual chlorine concentration measurement device according to a second embodiment.
FIG. 5 is a graph showing a relationship between an alarm set value and electric conductivity used in the second embodiment.
FIG. 6 is a graph of polarographic characteristics using the electric conductivity of a test liquid used in the second embodiment as a parameter.
FIG. 7 is a configuration diagram of a residual chlorine concentration measuring device according to a third embodiment.
FIG. 8 is a graph showing a relationship between an alarm set value and electric conductivity used in the third embodiment.
[Explanation of symbols]
1 sampling pump, 2 polarographic detectors,
21 polarographic detection tank, 22 rotation measuring electrode, 23 motor,
24 detection electrodes, 25 counter electrodes, 3 electric conductivity measuring devices,
31 electric conductivity measuring tank, 32 electric conductivity detector, 33 thermometer,
4 Electric conductivity correction device, 5 Residual chlorine amount indicating device,
6 polarographic change device, 61 electrical conductivity determination unit, 62 change rate determination unit,
7 pipeline system, 71-75 pipeline, 76 two-way on-off valve, 77 two-way on-off valve,
78 2-way on-off valve, 79 3-way on-off valve, 8 signal transmission line system,
81-84 Signal transmission line.

Claims (6)

被検査液体に含まれている濃度測定対象物質のポーラログラフ特性を検知するポーラログラフ検知装置、上記被検査液体の電気伝導度を測定する電気伝導度測定装置、上記電気伝導度測定装置により測定された電気伝導度に基づいて上記ポーラログラフ特性を変更するポーラログラフ変更装置、変更されたポーラログラフ特性から上記濃度測定対象物質の濃度を出力する濃度出力装置を備えたことを特徴とする濃度測定装置。Polarographic detection device for detecting the polarographic characteristics of the substance to be measured for concentration contained in the test liquid, electric conductivity measurement device for measuring the electric conductivity of the test liquid, electricity measured by the electric conductivity measurement device A concentration measuring device comprising: a polarographic change device that changes the polarographic characteristic based on conductivity; and a concentration output device that outputs a concentration of the concentration measurement target substance from the changed polarographic characteristic. 上記被検査液体の温度を測定する温度測定装置、上記電気伝導度測定装置により測定された上記被検査液体の電気伝導度と上記温度測定装置により測定された上記被検査液体の温度とから上記電気伝導度を規準温度における電気伝導度に補正する電気伝導度補正装置を備えたことを特徴とする請求項１記載の濃度測定装置。A temperature measuring device for measuring the temperature of the liquid to be inspected, the electric conductivity from the electric conductivity of the liquid to be inspected measured by the electric conductivity measuring device and the temperature of the liquid to be inspected measured by the temperature measuring device; 2. The concentration measuring device according to claim 1, further comprising an electric conductivity correcting device for correcting the electric conductivity to an electric conductivity at a reference temperature. 上記ポーラログラフ変更装置は、上記被検査液体の電気伝導度が規準値以上の場合には高電気伝導度用として予め設定された第一ポーラログラフ特性に変更し、上記被検査液体の電気伝導度が上記規準値より小さい場合には低電気伝導度用として予め設定された第二ポーラログラフ特性に変更することを特徴とする請求項１または請求項２記載の濃度測定装置。The polarographic change device, when the electric conductivity of the test liquid is equal to or more than a reference value, changes to a first polarographic characteristic preset for high electric conductivity, the electric conductivity of the test liquid is The concentration measuring device according to claim 1 or 2, wherein the concentration is changed to a second polarographic characteristic preset for low electric conductivity when the value is smaller than the reference value. 上記ポーラログラフ変更装置は、上記被検査液体の電気伝導度の時間的変化率が規準変化率以上の場合には電気伝導度高変化率用として予め設定された第三ポーラログラフ特性に変更し、上記被検査液体の電気伝導度の時間的変化率が上記規準変化率より小さい場合には電気伝導度低変化率用として予め設定された第四ポーラログラフ特性に変更することを特徴とする請求項１または請求項２記載の濃度測定装置。The polarographic change device, when the temporal change rate of the electrical conductivity of the test liquid is equal to or greater than a reference change rate, changes the polarographic characteristic to a third polarographic characteristic preset for a high electrical conductivity change rate, and 4. The method according to claim 1, wherein when the temporal change rate of the electrical conductivity of the test liquid is smaller than the reference change rate, the electrical conductivity is changed to a fourth polarographic characteristic preset for a low electrical conductivity change rate. Item 3. The concentration measuring device according to Item 2. 上記被検査液体を上記ポーラログラフ検知装置と上記電気伝導度測定装置に分配する管路を備えたことを特徴とする請求項１または請求項２記載の濃度測定装置。3. The concentration measuring device according to claim 1, further comprising a conduit for distributing the test liquid to the polarographic detecting device and the electric conductivity measuring device. 上記被検査液体は、塩素含有物質により処理されたものであり、上記濃度測定対象物質は、上記塩素含有物質により処理された上記被検査液体に残留する残留塩素であることを特徴とする請求項１〜請求項５のいずれか一項記載の濃度測定装置。The liquid to be inspected is processed with a chlorine-containing substance, and the concentration measurement target substance is residual chlorine remaining in the liquid to be inspected processed with the chlorine-containing substance. The concentration measuring device according to claim 1.
JP2003129275A 2003-05-07 2003-05-07 Concentration measuring device Expired - Fee Related JP4030458B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003129275A JP4030458B2 (en) 2003-05-07 2003-05-07 Concentration measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003129275A JP4030458B2 (en) 2003-05-07 2003-05-07 Concentration measuring device

Publications (2)

Publication Number Publication Date
JP2004333280A true JP2004333280A (en) 2004-11-25
JP4030458B2 JP4030458B2 (en) 2008-01-09

Family

ID=33505167

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003129275A Expired - Fee Related JP4030458B2 (en) 2003-05-07 2003-05-07 Concentration measuring device

Country Status (1)

Country Link
JP (1) JP4030458B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007129462A1 (en) * 2006-04-28 2007-11-15 Diesel United, Ltd. Conductive material concentration measuring device and magnetic material concentration measuring material
JP2010185864A (en) * 2009-01-16 2010-08-26 Yokogawa Electric Corp Residual chlorine meter
CN105675763A (en) * 2016-03-01 2016-06-15 张开航 Multifunctional chromatographic apparatus and method for measuring chloridion and total organic carbon
CN105675831A (en) * 2015-11-08 2016-06-15 张开航 Apparatus and method for measuring chlorine ion and total organic carbon in water
KR20220085969A (en) * 2020-12-16 2022-06-23 주식회사 워터비 Residual chlorine meter having comparative measurement and self-calibration function

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529629B (en) 2014-08-26 2021-05-12 Nicoventures Trading Ltd Electronic aerosol provision system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007129462A1 (en) * 2006-04-28 2007-11-15 Diesel United, Ltd. Conductive material concentration measuring device and magnetic material concentration measuring material
US8037740B2 (en) 2006-04-28 2011-10-18 Diesel United, Ltd. Conductive material concentration measuring device and magnetic material concentration measuring device
JP2010185864A (en) * 2009-01-16 2010-08-26 Yokogawa Electric Corp Residual chlorine meter
CN105675831A (en) * 2015-11-08 2016-06-15 张开航 Apparatus and method for measuring chlorine ion and total organic carbon in water
CN105675763A (en) * 2016-03-01 2016-06-15 张开航 Multifunctional chromatographic apparatus and method for measuring chloridion and total organic carbon
KR20220085969A (en) * 2020-12-16 2022-06-23 주식회사 워터비 Residual chlorine meter having comparative measurement and self-calibration function
KR102570508B1 (en) * 2020-12-16 2023-08-24 주식회사 워터비 Residual chlorine meter having comparative measurement and self-calibration function

Also Published As

Publication number Publication date
JP4030458B2 (en) 2008-01-09

Similar Documents

Publication Publication Date Title
KR100749318B1 (en) Apparatus for optimum water-quality test and notice for water-supply course and the method for the same
EP0897538B1 (en) Method and apparatus for the measurement of dissolved carbon in deionized water
JPS6291861A (en) On-line calibrating apparatus for chemical monitor
JP6394263B2 (en) Water quality analyzer
CN104345034A (en) Method for determining chemical oxygen demand of liquid sample and analyzer
US20080285012A1 (en) METHOD FOR MEASURING CHEMICAL LEVELS USING pH SHIFT
JP2004333280A (en) Concentration-measuring device
JP2011169859A (en) Method and device for automatically managing chlorine concentration
CN104977393B (en) A kind of ship ballast water treatment system online effective chlorine detector and detection method
CN112305034B (en) Method for calibrating an analytical measurement device and measurement points of an analytical measurement device
US20230152266A1 (en) Inorganic carbon (ic) excluded conductivity measurement of aqueous samples
US20210033562A1 (en) Method for calibrating an analytical measuring device and measuring point for analyzing a process medium and for calibrating an analytical measuring device
JP2005291994A (en) System for monitoring water quality
US20210033590A1 (en) Method for determining a chemical intake capacity of a process medium in a measuring point and measuring point for determining a chemical intake capacity of a process medium
JP3533573B1 (en) Automatic chlorine concentration measuring device and chlorine concentration measuring method
US6652721B2 (en) Sensor for determination of O2 concentration in liquids
EP2853888A2 (en) Measuring method for chlorine and pH
JP2000221165A (en) Apparatus for measuring concentration of residual chlorine
JP4516364B2 (en) Chlorine demand measuring device, water quality management system, chlorine demand measuring method, and water quality management method
CN204807542U (en) Ship ballast water processing system is with online effective chlorine detector
Álvares-Ribeiro et al. Optimization of a bipotentiometric flow injection analysis system for simultaneous determination of calcium and chloride ions in natural waters
JPH02159548A (en) Ion density analyzer
JP4115160B2 (en) Switchable measurement method
JP4481749B2 (en) Measuring method of chlorine consumption and chlorine demand
Whittle et al. Chlorine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050106

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070213

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070327

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070528

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070710

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070906

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20071002

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071016

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101026

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees