JP2001201476A - Acid densitometer and method for measuring acid concentration - Google Patents
Acid densitometer and method for measuring acid concentrationInfo
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- JP2001201476A JP2001201476A JP2000011988A JP2000011988A JP2001201476A JP 2001201476 A JP2001201476 A JP 2001201476A JP 2000011988 A JP2000011988 A JP 2000011988A JP 2000011988 A JP2000011988 A JP 2000011988A JP 2001201476 A JP2001201476 A JP 2001201476A
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- Prior art keywords
- acid solution
- acid
- acid concentration
- measurement
- measuring
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、酸濃度計および酸
濃度測定法に関する。具体的には、本発明は、電磁濃度
計と希釈装置とを備え、酸液の酸濃度を正確に測定する
ことができる酸濃度計および酸濃度測定法に関する。The present invention relates to an acid concentration meter and an acid concentration measuring method. Specifically, the present invention relates to an acid concentration meter and an acid concentration measurement method that include an electromagnetic densitometer and a diluting device and that can accurately measure the acid concentration of an acid solution.
【０００２】[0002]
【従来の技術】例えば鋼帯の製造工程では、一般的に、
複数の酸洗槽にそれぞれ収容された酸液に鋼帯を連続的
に浸漬することにより、酸洗が行われる。この酸洗で
は、酸洗量の増加によって各酸洗槽にそれぞれ収容され
た酸液の酸濃度が徐々に低下するため、酸洗槽に酸液を
補給する必要がある。しかし、この補給量が多過ぎる
と、酸洗槽に収容された酸液の酸濃度が目標値よりも高
くなり過ぎて過酸洗が発生するとともに酸原単位が上昇
し、一方、補給量が少な過ぎると、酸洗槽に収容された
酸液の酸濃度が目標値よりも低くなり過ぎて酸洗不良が
発生する。そこで、酸洗槽に補給する酸液の酸濃度を正
確に測定して、酸洗槽への酸液の補給量を過不足ないよ
うに決定することが重要である。2. Description of the Related Art In a steel strip manufacturing process, for example, generally,
Pickling is performed by continuously immersing the steel strip in an acid solution stored in each of a plurality of pickling tanks. In this pickling, it is necessary to replenish the pickling tank with the pickling tank because the acid concentration of the pickling tank contained in each pickling tank gradually decreases as the pickling amount increases. However, if the replenishment amount is too large, the acid concentration of the acid solution contained in the pickling tank becomes too high from the target value, causing over-acid cleaning and an increase in the basic unit of acid. If the amount is too small, the acid concentration of the acid solution contained in the pickling tank will be too low below the target value, resulting in poor pickling. Therefore, it is important to accurately measure the acid concentration of the acid solution to be supplied to the pickling tank and determine the amount of the acid solution to be supplied to the pickling tank so as not to be excessive or insufficient.
【０００３】従来、酸洗槽に収容された酸液の酸濃度を
正確に測定することができる分析計として、微量のサン
プル液、試薬および洗浄液を交互に測定セル内に導入す
ることにより酸濃度を求める中和滴定式分析計が知られ
ている。しかし、この中和滴定式分析計は非常に高価で
ある。また、オフライン計器であるために連続測定を行
うことができず、酸洗槽に補給する酸液の酸濃度をオン
ライン制御するために用いる工業計器としては、適当で
ない。Conventionally, as an analyzer capable of accurately measuring the acid concentration of an acid solution contained in a pickling tank, a small amount of a sample solution, a reagent and a washing solution are alternately introduced into a measuring cell to thereby obtain an acid concentration. Is known. However, this neutralization titration analyzer is very expensive. Moreover, since it is an off-line instrument, continuous measurement cannot be performed, and it is not suitable as an industrial instrument used for on-line control of the acid concentration of the acid solution supplied to the pickling tank.
【０００４】酸液の濃度を測定することができる工業計
器として、電磁濃度計が知られている。この電磁濃度計
は、測定する酸液（本明細書では、測定対象であるこの
酸液を「測定酸液」という。）の導電率を測定し、この
測定値に基づいて酸濃度を求める濃度計であり、安価で
あって酸濃度を正確に求めることができる。しかし、こ
の電磁濃度計には、酸濃度の測定を正確に行うことがで
きる測定精度保証域がある。[0004] As an industrial instrument capable of measuring the concentration of an acid solution, an electromagnetic densitometer is known. This electromagnetic densitometer measures the conductivity of an acid solution to be measured (this acid solution to be measured is referred to as a “measurement acid solution” in this specification), and determines the acid concentration based on the measured value. It is inexpensive and can accurately determine the acid concentration. However, this electromagnetic densitometer has a measurement accuracy guarantee region in which the acid concentration can be accurately measured.
【０００５】図６は、酸液（塩酸）の酸濃度と導電率と
の関係の一例を示すグラフである。図６のグラフに実線
で示すように、測定する塩酸の酸濃度が０％（本明細書
では特にことわりがない限り「％」は「質量％」を意味
する。）以上２０％未満の範囲では導電率は単調増加す
るが、酸濃度が２０％になると導電率は最大となり、さ
らに酸濃度が２０％超４０％以下の範囲では導電率は単
調減少する。このため、例えば、電磁濃度計による導電
率の測定値が０．７ｓ／ｃｍである場合、酸濃度が約１
５％であるのか約２８％であるのかを判定することがで
きない。また、このグラフにも示すように、酸濃度が１
５％超２８％以下の範囲ｂは、電磁濃度計の分解精度が
低く測定精度保証範囲外である。このため、この電磁濃
度計では、１５％超２８％以下という範囲ｂの酸濃度は
測定できず、例えば、酸濃度が０％超１５％以下である
測定精度保証域ａと、酸濃度が２８％超４０％以下であ
る測定精度保証域ｃとを設定せざるを得なかった。この
ため、この電磁濃度計を、酸洗槽に供給する酸液の酸濃
度の測定に適用しようとすると、測定範囲が狭過ぎると
いう問題があった。FIG. 6 is a graph showing an example of the relationship between the acid concentration of an acid solution (hydrochloric acid) and the electrical conductivity. As shown by the solid line in the graph of FIG. 6, when the acid concentration of the hydrochloric acid to be measured is in the range of 0% (in this specification, “%” means “% by mass” unless otherwise specified) or more and less than 20%. Although the conductivity monotonically increases, the conductivity becomes maximum when the acid concentration becomes 20%, and further decreases monotonically when the acid concentration is more than 20% and 40% or less. Therefore, for example, when the measured value of the conductivity by the electromagnetic densitometer is 0.7 s / cm, the acid concentration is about 1
It cannot be determined whether it is 5% or about 28%. Also, as shown in this graph, the acid concentration was 1
In the range b of more than 5% and 28% or less, the resolution of the electromagnetic densitometer is low and is out of the measurement accuracy guarantee range. Therefore, this electromagnetic densitometer cannot measure an acid concentration in a range b of more than 15% to 28% or less. For example, a measurement accuracy guaranteed area a in which the acid concentration is more than 0% and 15% or less, and an acid concentration of 28% or less. % Of the measurement accuracy assurance range c which is more than 40% or less. Therefore, when this electromagnetic densitometer is applied to the measurement of the acid concentration of the acid solution supplied to the pickling tank, there is a problem that the measurement range is too narrow.
【０００６】図７は、塩酸以外の酸液について、酸濃度
と導電率との関係の一例を、塩化ナトリウムと対比させ
て示すグラフである。図７にグラフで示すように、硝酸
および硫酸等も、塩酸と同様の傾向を示すため、電磁濃
度計には、測定精度保証域を適宜設定せざるを得ない。
そこで、特開平９−２６４０４号公報には、メインプロ
ーブを、水により希釈された酸液（本明細書では「希釈
酸液」という。）に浸漬してこの希釈酸液の導電率を検
出し、この希釈酸液の導電率対濃度の関係より、検出し
た導電率に対応する濃度を決定することにより、酸濃度
を求めることが記載されている。FIG. 7 is a graph showing an example of the relationship between the acid concentration and the conductivity of an acid solution other than hydrochloric acid in comparison with sodium chloride. As shown in the graph of FIG. 7, nitric acid, sulfuric acid, and the like also show the same tendency as hydrochloric acid, so that the measurement accuracy assurance range must be set appropriately in the electromagnetic densitometer.
Japanese Patent Application Laid-Open No. 9-26404 discloses that the main probe is immersed in an acid solution diluted with water (referred to as “dilute acid solution” in this specification) to detect the conductivity of the diluted acid solution. It is described that the acid concentration is determined by determining the concentration corresponding to the detected conductivity from the relationship between the conductivity and the concentration of the diluted acid solution.
【０００７】[0007]
【発明が解決しようとする課題】しかし、酸液の酸濃度
と導電率との間には、図６および図７を参照しながら前
述した関係が存在するため、特開平９−２６４０４号公
報により提案された発明を実施するには、少なくとも２
基の導電率計や制御装置さらには記憶部等を設けて、酸
濃度が０〜２０％未満の範囲にあるのか、あるいは２０
〜４０％の範囲にあるのかを判定する必要がある。この
ため、この発明によっても、装置が複雑化して高価にな
ってしまう。However, since the relationship described above with reference to FIGS. 6 and 7 exists between the acid concentration and the conductivity of the acid solution, Japanese Patent Application Laid-Open No. 9-26404 discloses To implement the proposed invention, at least 2
A basic conductivity meter, a control device, and a storage unit are provided so that the acid concentration is in the range of 0 to less than 20%, or
It is necessary to determine whether it is within the range of ４０40%. For this reason, according to the present invention, the apparatus is complicated and expensive.
【０００８】本発明の目的は、部品点数が少ないために
保守性が良好であるとともに設備故障の頻度が少ないこ
とから長期間安定稼働でき、さらに極めて安価に製作す
ることができる酸濃度計および酸濃度測定法を提供する
ことである。It is an object of the present invention to provide an acid concentration meter and an acid concentration meter which can be operated stably for a long period of time because the number of parts is small and the maintainability is good and the frequency of equipment failure is small, and which can be manufactured at extremely low cost. The purpose is to provide a method for measuring the concentration.
【０００９】[0009]
【課題を解決するための手段】本発明は、測定酸液を電
磁濃度計の測定精度保証域の酸濃度に一旦希釈してから
酸濃度を測定し、この測定値とこの希釈の際の希釈比と
により、測定酸液の酸濃度を正確に求めることができる
こと、さらには、この希釈を水頭差式希釈装置を用いて
行うことが、設備コストの上昇を大幅に抑制できるとと
もに、測定精度を極めて容易かつ確実に所望の程度に設
定することができるために望ましいこと、という新規な
知見に基づくものである。SUMMARY OF THE INVENTION According to the present invention, an acid solution is temporarily diluted to an acid concentration within a measurement accuracy guarantee range of an electromagnetic densitometer, and then the acid concentration is measured. By using the ratio, it is possible to accurately determine the acid concentration of the acid solution to be measured, and furthermore, performing this dilution using a head difference type diluter can greatly suppress the increase in equipment cost and improve the measurement accuracy. This is based on a novel finding that it is desirable to be able to set the desired degree extremely easily and reliably.
【００１０】本発明は、酸液の酸濃度の測定精度保証域
を有する電磁濃度計と、測定対象である測定酸液を測定
精度保証域の酸濃度に希釈する希釈装置とを備え、電磁
濃度計を用いて、希釈装置により測定精度保証域の酸濃
度に希釈された希釈酸液の酸濃度を測定することによ
り、測定酸液の酸濃度を求めることを特徴とする酸濃度
計である。The present invention comprises an electromagnetic densitometer having an area for guaranteeing the measurement accuracy of the acid concentration of an acid solution, and a diluting device for diluting the measured acid solution to be measured to an acid concentration within the measurement accuracy guarantee range. An acid concentration meter characterized in that an acid concentration of a measured acid solution is obtained by measuring an acid concentration of a diluted acid solution diluted to an acid concentration in a measurement accuracy assurance range by a diluter using a meter.
【００１１】この本発明にかかる酸濃度計では、電磁濃
度計が、希釈酸液の導電率を測定する測定部と、希釈酸
液の導電率の測定値および希釈酸液の希釈比に基づい
て、測定酸液の酸濃度を算出する演算部とを有すること
が、例示される。In the acid concentration meter according to the present invention, the electromagnetic concentration meter includes a measuring unit for measuring the conductivity of the diluted acid solution, and a measuring unit for measuring the conductivity of the diluted acid solution and a dilution ratio of the diluted acid solution. And an arithmetic unit for calculating the acid concentration of the measurement acid solution.
【００１２】これらの本発明にかかる酸濃度計では、希
釈装置が、水頭差式希釈装置であることが、設備コスト
の上昇を大幅に抑制できるとともに、測定精度を極めて
容易かつ確実に所望の程度に設定することができるため
に望ましい。In the acid concentration meter according to the present invention, since the diluting device is a head difference type diluting device, it is possible to greatly suppress an increase in equipment cost, and it is possible to extremely easily and surely measure the accuracy of measurement. Is desirable because it can be set to
【００１３】この場合に、水頭差式希釈装置は、略同一
高さに設置された測定酸液収容槽および希釈液収容槽
と、該測定酸液収容槽および希釈液収容槽それぞれに下
方へ向けて接続された二本の配管と、該二本の配管の下
方に接続されて測定酸液および希釈液を混合する混合槽
とを有することが、例示される。In this case, the head difference type diluting device includes a measuring acid solution storing tank and a diluting solution storing tank installed at substantially the same height, and a measuring acid solution storing tank and a diluting solution storing tank which are respectively directed downward. It is exemplified to have two pipes connected together and a mixing tank connected below the two pipes to mix the measuring acid solution and the diluting liquid.
【００１４】この本発明にかかる酸濃度計では、電磁濃
度計の測定部が、混合槽に設けられることが、例示され
る。In the acid concentration meter according to the present invention, it is exemplified that the measurement unit of the electromagnetic concentration meter is provided in the mixing tank.
【００１５】これらの本発明にかかる酸濃度計では、混
合槽における測定酸液および希釈液それぞれの混合比
が、酸液収容槽に供給された測定酸液、および希釈液収
容槽に供給された希釈液それぞれの水頭位置を略同一と
すること、または、この水頭位置を異ならせることによ
り、調整されることが例示される。In the acid concentration meter according to the present invention, the respective mixing ratios of the measuring acid solution and the diluting solution in the mixing tank are supplied to the measuring acid solution supplied to the acid solution storing tank and the diluting solution storing tank. The adjustment is made by making the head positions of the diluents substantially the same or by making the head positions different.
【００１６】この本発明にかかる酸濃度計では、水頭位
置を略同一とすることは、二本の配管それぞれの内径を
異ならせること、および、二本の配管にそれぞれ設けら
れた二つの流量調整弁の開度をそれぞれ調整することの
うちの少なくとも一方により、行われることが例示され
る。In the acid concentration meter according to the present invention, making the water head positions substantially the same means that the inner diameters of the two pipes are different from each other, and the two flow rate adjustments respectively provided on the two pipes. This is exemplified by at least one of adjusting the opening of the valve.
【００１７】別の観点からは、本発明は、測定対象であ
る測定酸液を、電磁濃度計の測定精度保証域の酸濃度へ
希釈した後、測定精度保証域へ希釈された希釈酸液の酸
濃度を電磁濃度計を用いて測定し、電磁濃度計による希
釈酸液の酸濃度の測定値と希釈酸液の希釈比とに基づい
て、測定酸液の酸濃度を算出することを特徴とする酸濃
度測定法である。From another viewpoint, the present invention provides a method for diluting an acid solution to be measured into an acid concentration in a measurement accuracy guarantee area of an electromagnetic densitometer, and then diluting the diluted acid solution into the measurement accuracy guarantee area. Measuring the acid concentration using an electromagnetic densitometer, and calculating the acid concentration of the measured acid solution based on the measured value of the acid concentration of the diluted acid solution by the electromagnetic densitometer and the dilution ratio of the diluted acid solution. This is an acid concentration measurement method.
【００１８】この本発明にかかる酸濃度測定法では、測
定酸液の希釈が、水頭差式希釈装置を用いて、行われる
ことが、この酸濃度測定法の実施に要するコストの上昇
を大幅に抑制できるとともに、測定精度を極めて容易か
つ確実に所望の程度に設定することができるために望ま
しい。In the acid concentration measuring method according to the present invention, the dilution of the acid solution to be measured is performed by using a head difference type diluting apparatus, which significantly increases the cost required for performing the acid concentration measuring method. This is desirable because the measurement accuracy can be set very easily and reliably to a desired degree, as well as being suppressed.
【００１９】[0019]
【発明の実施の形態】（第１実施形態）以下、本発明に
かかる酸濃度計および酸濃度測定法の実施の形態を、添
付図面を参照しながら詳細に説明する。なお、以降の実
施の形態の説明では、酸液が塩酸である場合を例にと
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, embodiments of an acid concentration meter and an acid concentration measuring method according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, an example in which the acid solution is hydrochloric acid will be described.
【００２０】図１は、本実施形態の酸濃度計１の構成の
一例を模式的に示す説明図である。また、図２は、図１
におけるＡ部の拡大図である。図１に示すように、この
酸濃度計１は、電磁濃度計２と、水頭差式希釈装置３と
を有する。以下、酸濃度計１のこれらの構成要素につい
て、順次説明する。FIG. 1 is an explanatory view schematically showing an example of the configuration of the acid concentration meter 1 of the present embodiment. FIG. 2 is similar to FIG.
It is an enlarged view of the A section in. As shown in FIG. 1, the acid concentration meter 1 has an electromagnetic concentration meter 2 and a head difference type dilution device 3. Hereinafter, these components of the acid concentration meter 1 will be sequentially described.
【００２１】〔電磁濃度計２〕本実施形態の酸濃度計１
は電磁濃度計２を有する。この電磁濃度計２は、図１に
示すように、測定部２ａと演算部（アンプ）２ｂとを有
しており、図６のグラフを参照しながら前述した公知の
電磁濃度計である。すなわち、図６のグラフに示すよう
に、この電磁濃度計２は、酸濃度が０％以上１５％以下
である測定精度保証域ａと、酸濃度が２８％超４０％以
下である測定精度保証域ｃとを設定されている。[Electromagnetic concentration meter 2] Acid concentration meter 1 of the present embodiment
Has an electromagnetic densitometer 2. As shown in FIG. 1, the electromagnetic densitometer 2 has a measuring unit 2a and a calculating unit (amplifier) 2b, and is a known electromagnetic densitometer described above with reference to the graph of FIG. That is, as shown in the graph of FIG. 6, the electromagnetic densitometer 2 has a measurement accuracy guarantee area a in which the acid concentration is 0% or more and 15% or less, and a measurement accuracy guarantee area in which the acid concentration is more than 28% and 40% or less. The area c is set.
【００２２】測定部２ａは、後述する混合槽７に設けら
れており、０％以上１５％以下の酸濃度に希釈されて混
合槽７内に収容された希釈酸液１３ａの導電率（電気伝
導度）σを測定する。The measuring section 2a is provided in a mixing tank 7 to be described later. The measuring section 2a is diluted to an acid concentration of 0% or more and 15% or less and stored in the mixing tank 7 with the conductivity (electric conductivity) of the diluted acid solution 13a. Degree) σ is measured.
【００２３】一方、演算部２ｂは、測定部２ａからの導
電率σの測定データを入力され、この測定データに基づ
いて、希釈酸液１３ａの酸濃度ＣHCl を算出する。[0023] On the other hand, the calculation unit 2b is input to the measurement data of the conductivity σ of the measuring portion 2a, on the basis of the measured data, calculates the acid concentration C HCl in dilute acid solution 13a.
【００２４】また、演算部２ｂの正面には、算出された
酸濃度ＣHCl がリアルタイムで表示される表示部４ａが
設けられている。後述する微調整の際には、同じく後述
する測定酸液供給槽５ａから供給された検定用酸液９
ａ’の酸濃度が、測定精度保証域ａの上限値である１５
％を指示するように、表示部４ａの指示値を見ながら後
述する流量調整弁１０ａ、１０ｂの開度を手動で適宜設
定する。In addition, a display unit 4a for displaying the calculated acid concentration CHCl in real time is provided in front of the calculation unit 2b. At the time of fine adjustment described later, the test acid solution 9 supplied from the measurement acid solution supply tank 5a also described later is used.
The acid concentration of a ′ is 15 which is the upper limit of the measurement accuracy guarantee area a.
The opening of the flow rate adjusting valves 10a and 10b, which will be described later, is manually set as appropriate while referring to the indicated value on the display unit 4a so as to indicate%.
【００２５】また、演算部２ｂは、後述する粗調整およ
び微調整を経て設定された水頭差式希釈装置３の希釈比
ｘ’を手動で入力する入力部４ｂが設けられる。入力部
４ｂから入力された希釈比ｘ’は、演算部２ｂに記憶・
保持される。The calculating section 2b is provided with an input section 4b for manually inputting the dilution ratio x 'of the head difference type dilution apparatus 3 set through coarse adjustment and fine adjustment described later. The dilution ratio x ′ input from the input unit 4b is stored in the arithmetic unit 2b.
Will be retained.
【００２６】また、演算部２ｂは、記憶・保持された希
釈比ｘ’に基づいて、測定酸液９ａの酸濃度を算出す
る。すなわち、演算部２ｂは、測定酸液９ａの酸濃度
を、自身が演算により求めた希釈酸液１３ａの酸濃度の
測定値ＣHCl と、水頭差式希釈装置３による希釈酸液１
３ａの希釈比ｘ’との積ＣHCl ・ｘ’として算出し、表
示部４ｃに表示する。The calculating section 2b calculates the acid concentration of the measured acid solution 9a based on the stored and retained dilution ratio x '. That is, the calculation unit 2b calculates the acid concentration of the measured acid solution 9a, the measured value C HCl of the acid concentration of the diluted acid solution 13a obtained by the calculation itself, and the diluted acid solution 1 by the head difference type dilution device 3.
The product is calculated as the product C HCl · x ′ of the dilution ratio x ′ of 3a and displayed on the display unit 4c.
【００２７】本実施形態で用いる電磁濃度計２のこれら
以外の構成は、工業計器として周知慣用の電磁濃度計２
の構成と同じであるため、これ以上の説明は省略する。The other components of the electromagnetic densitometer 2 used in the present embodiment are the same as those commonly used as industrial instruments.
Since the configuration is the same as that described above, further description is omitted.
【００２８】本実施形態の電磁濃度計２は、以上のよう
に構成される。The electromagnetic densitometer 2 of the present embodiment is configured as described above.
【００２９】〔水頭差式希釈装置３〕本実施形態の酸濃
度計１は水頭差式希釈装置３を有する。本実施形態で
は、この水頭差式希釈装置３は、同一高さに設置された
測定酸液収容槽５ａおよび希釈液収容槽５ｂと、この測
定酸液収容槽５ａおよび希釈液収容槽５ｂそれぞれに、
下方へ向けて接続された二本の配管６ａ、６ｂと、この
二本の配管６ａ、６ｂの下方に接続されて測定酸液９ａ
および希釈液９ｂを混合する混合槽７とを有する。[Hydraulic Head Type Dilution Apparatus 3] The acid concentration meter 1 of the present embodiment has a hydrohead type diluting apparatus 3. In the present embodiment, the head difference type diluting device 3 includes a measurement acid solution storage tank 5a and a diluent solution storage tank 5b installed at the same height, and a measurement acid solution storage tank 5a and a diluent solution storage tank 5b, respectively. ,
Two pipes 6a, 6b connected downward, and a measuring acid solution 9a connected below the two pipes 6a, 6b.
And a mixing tank 7 for mixing the diluent 9b.
【００３０】この二本の配管６ａ、６ｂは、いずれも、
口径が例えば５〜３０ｍｍ程度の大口径管を用いてお
り、測定酸液９ａの詰まりが防止される。また、各部の
材質は、測定酸液収容槽５ａおよび希釈液収容槽５ｂ：
耐熱性塩化ビニルやＰＴＦＥ製、配管６ａ、６ｂ：耐熱
性塩化ビニルやＰＴＦＥ製、混合槽７：耐熱性塩化ビニ
ルやＰＴＦＥ製であり、塩酸による腐食にも長期間にわ
たって充分に耐えることができる材質により構成されて
いるため、本実施形態の水頭差式希釈装置３は、長期間
に渡って充分に安定して稼働することができる。Each of the two pipes 6a and 6b is
A large-diameter tube having a diameter of, for example, about 5 to 30 mm is used, and clogging of the measuring acid solution 9a is prevented. The material of each part is as follows: the measuring acid solution storage tank 5a and the diluting solution storage tank 5b:
Made of heat-resistant vinyl chloride or PTFE, piping 6a, 6b: made of heat-resistant vinyl chloride or PTFE, mixing tank 7: made of heat-resistant vinyl chloride or PTFE, and can withstand corrosion by hydrochloric acid for a long time. Therefore, the head difference type dilution device 3 of the present embodiment can operate sufficiently stably for a long period of time.
【００３１】また、本実施形態の水頭差式希釈装置３
は、簡素な構成であるために部品点数を最小限に抑制し
てあるとともに可動部が少なく、かつ電磁弁や流量セン
サ等の高価な部品を用いていない。このため、制作費は
最小限であり、極めて安価に構成される。The head difference type dilution device 3 of the present embodiment
Has a simple structure, the number of parts is minimized, the number of movable parts is small, and expensive parts such as a solenoid valve and a flow sensor are not used. For this reason, the production cost is minimal and the construction is extremely inexpensive.
【００３２】また、図１および図２に示すように、本実
施形態では、測定酸液収容槽５ａおよび希釈液収容槽５
ｂそれぞれの上部に同じ設置高さで、流入液量を上回る
排出液量を確保できる口径を有するオーバーフロー配管
８ａ、８ｂがそれぞれ水平方向へ向けて設置されてい
る。As shown in FIGS. 1 and 2, in this embodiment, the measuring acid solution storage tank 5a and the diluting solution storage tank 5
The overflow pipes 8a and 8b having the same installation height and having a diameter capable of securing a discharge liquid amount exceeding the inflow liquid amount are respectively installed in the upper part of each of the b.
【００３３】図２に示すように、測定酸液収容槽５ａの
内部中心にもオーバーフロー配管８ａ’が設置されてい
るとともに、希釈液収容槽５ｂの内部中心にもオーバー
フロー配管８ｂ’（図示しない。）が設置されている。
これにより、充分な排出液量が確保される。As shown in FIG. 2, an overflow pipe 8a 'is provided at the center of the measuring acid solution storage tank 5a, and an overflow pipe 8b' (not shown) is also provided at the center of the diluting liquid storage tank 5b. ) Is installed.
This ensures a sufficient amount of discharged liquid.
【００３４】なお、オーバーフロー配管８ａ、８ａ’、
８ｂ、８ｂ’の設置形態は、図示例に限定されるもので
はなく、測定酸液収容槽５ａに供給された測定酸液９
ａ、および希釈液収容槽５ｂに供給された希釈液９ｂそ
れぞれの水頭位置の変動をできるだけ抑制できるよう
に、設置されていればよい。The overflow pipes 8a, 8a ',
The installation form of 8b, 8b 'is not limited to the illustrated example, but the measurement acid solution 9 supplied to the measurement acid solution storage tank 5a.
a and the diluent 9b supplied to the diluent storage tank 5b may be installed so that the fluctuation of the water head position of each diluent 9b can be suppressed as much as possible.
【００３５】このため、測定酸液収容槽５ａに供給され
た測定酸液９ａ、および希釈液収容槽５ｂに供給された
希釈液９ｂそれぞれの液面が上昇してくると、オーバー
フロー配管８ａ、８ａ’、８ｂ、８ｂ’を介して、過剰
な測定酸液９ａおよび希釈液９ｂがそれぞれオーバーフ
ローする。これにより、測定酸液収容槽５ａに供給され
た測定酸液９ａ、および希釈液収容槽５ｂに供給された
希釈液９ｂそれぞれの液面の変動は、オーバーフロー配
管８ａ、８ａ’、８ｂ、８ｂ’を測定酸液収容槽５ａお
よび希釈液収容槽５ｂにそれぞれ設置可能な範囲で、測
定酸液収容槽５ａおよび希釈液収容槽５ｂそれぞれの全
高さより限りなく低い範囲に最小限に抑制されて液面が
安定し、同一の水頭高さＨが容易に維持される。この
際、配管６ａ、６ｂに作用する測定酸液９ａ、希釈液９
ｂそれぞれの水頭変動誤差はＨ' ／Ｈとして求められる
が、この誤差Ｈ' ／Ｈを適宜設定することにより希釈精
度および再現性をいずれも充分に確保することができ
る。例えば、高さＨ’を５ｍｍ、水頭高さＨを３００ｍ
ｍとそれぞれ設定すれば、誤差Ｈ' ／Ｈは約０．０１７
となり、工業計器として要求される精度であるＦｓ±
０．２５〜０．５０を充分に満足することができる。こ
のため、本実施形態の水頭差式希釈装置３は、測定精度
（測定誤差）の設定の自由度が極めて高い。このよう
に、測定酸液収容槽５ａおよび希釈液収容槽５ｂは、い
ずれも、水頭位置を一定に保つ役割を奏する。Therefore, when the liquid levels of the measuring acid solution 9a supplied to the measuring acid solution storage tank 5a and the diluent 9b supplied to the diluting solution storage tank 5b rise, the overflow pipes 8a, 8a Excess measuring acid solution 9a and diluting solution 9b overflow through ', 8b and 8b', respectively. Thus, the fluctuations in the liquid levels of the measurement acid solution 9a supplied to the measurement acid solution storage tank 5a and the diluent 9b supplied to the diluent solution storage tank 5b are caused by the overflow pipes 8a, 8a ', 8b, 8b'. Is minimized to a range that can be set in the measuring acid solution storage tank 5a and the diluting solution storage tank 5b, respectively, to a level as low as possible without exceeding the total height of the measuring acid solution storage tank 5a and the diluting solution storage tank 5b. Is stable, and the same head height H is easily maintained. At this time, the measuring acid solution 9a and the diluting solution 9 acting on the pipes 6a and 6b
b Each head variation error is obtained as H '/ H. By appropriately setting the error H' / H, both dilution accuracy and reproducibility can be sufficiently ensured. For example, the height H 'is 5 mm, and the water head height H is 300 m
m, the error H '/ H is about 0.017
And the accuracy required for industrial instruments, Fs ±
0.25 to 0.50 can be sufficiently satisfied. For this reason, the head difference type dilution apparatus 3 of this embodiment has a very high degree of freedom in setting the measurement accuracy (measurement error). Thus, both the measuring acid solution storage tank 5a and the diluting liquid storage tank 5b play a role of keeping the water head position constant.
【００３６】本実施形態では、配管６ａ、６ｂそれぞれ
に流量調整弁１０ａ、１０ｂが設けられており、これら
流量調整弁１０ａ、１０ｂの開度を、表示部４ａに表示
された希釈酸液１３ａの酸濃度の測定値ＣHCl を見なが
ら手動で適宜設定することにより、後述する希釈比ｘ’
への微調整が行われる。In the present embodiment, the flow control valves 10a and 10b are provided in the pipes 6a and 6b, respectively, and the opening degree of the flow control valves 10a and 10b is changed according to the diluent acid solution 13a displayed on the display unit 4a. By manually setting the measured value of the acid concentration while viewing the measured value of the HCl , the dilution ratio x ′ described later is obtained.
Is fine-tuned.
【００３７】さらに、測定酸液収容槽５ａ、希釈液収容
槽５ｂには、それぞれ、エアー抜き用配管１１ａ、１１
ｂが設置されているとともに、混合槽７には、エアー抜
き用配管１２ａ、１２ｂが設置されている。Further, the measuring acid solution storage tank 5a and the diluent solution storage tank 5b are respectively provided with air vent pipes 11a and 11b.
b, and the mixing tank 7 is provided with air vent pipes 12a and 12b.
【００３８】本実施形態では、この水頭差式希釈装置３
による希釈比ｘ’、すなわち混合槽７における測定酸液
９ａおよび希釈液９ｂそれぞれの混合比は、測定酸液収
容槽５ａに供給された測定酸液９ａ、および希釈液収容
槽５ｂに供給された希釈液９ｂそれぞれの水頭位置を同
一とすること、または、この水頭位置を異ならせること
を行われることにより、適宜調整される。以下、この水
頭差式希釈装置３による希釈比ｘ’の設定について、詳
細に説明する。In this embodiment, the head difference type dilution device 3
, Ie, the respective mixing ratios of the measuring acid solution 9a and the diluting solution 9b in the mixing tank 7 were supplied to the measuring acid solution 9a and the diluting solution tank 5b supplied to the measuring acid solution storing tank 5a. The diluting solution 9b is appropriately adjusted by making the water head positions the same or making the water head positions different. Hereinafter, the setting of the dilution ratio x ′ by the head difference type dilution device 3 will be described in detail.
【００３９】水頭差式希釈装置３による希釈比ｘ’は、
測定酸液９ａの酸濃度の測定を行う前に、粗調整と微調
整との２段階により調整される。The dilution ratio x ′ by the head difference type dilution device 3 is:
Before the measurement of the acid concentration of the measurement acid solution 9a, the adjustment is performed in two steps of coarse adjustment and fine adjustment.
【００４０】第１段階である粗調整は、測定酸液９ａと
して酸濃度が既知である検定用酸液９ａ’を用いて行わ
れる。本実施形態では、酸濃度が４０％である検定用酸
液９ａ’を用いた。The first step, the rough adjustment, is performed using a test acid solution 9a 'having a known acid concentration as the measurement acid solution 9a. In the present embodiment, the acid solution for test 9a 'having an acid concentration of 40% was used.
【００４１】図３は、塩酸の酸濃度と導電率との関係の
一例を示すグラフである。FIG. 3 is a graph showing an example of the relationship between the acid concentration of hydrochloric acid and the electrical conductivity.
【００４２】同図にグラフで示すように、本実施形態で
用いる電磁濃度計２は、図３にグラフで示す導電率の測
定特性を有するため、この検定用酸液９ａ’による測定
値が、電磁濃度計２の測定精度保証域ａの上限値である
１５％となるように、水頭差式希釈装置３の希釈比の検
定（調整）を行う。As shown in the graph of FIG. 3, the electromagnetic densitometer 2 used in the present embodiment has the conductivity measurement characteristics shown in the graph of FIG. Verification (adjustment) of the dilution ratio of the head difference type dilution apparatus 3 is performed so that the upper limit of the measurement accuracy guarantee area a of the electromagnetic densitometer 2 is 15%.
【００４３】まず、この検定用酸液９ａ’を測定酸液収
容槽５ａに、検定用酸液９ａ’がオーバーフロー配管８
ａ、８ａ’からオーバーフローするまで供給するととも
に、希釈液９ｂを希釈液収容槽５ｂに、希釈液９ｂがオ
ーバーフロー配管８ｂ、８ｂ’からオーバーフローする
まで供給する。First, the test acid solution 9a 'is placed in the measuring acid solution storage tank 5a, and the test acid solution 9a' is
The diluent 9b is supplied to the diluent storage tank 5b until the diluent 9b overflows from the overflow pipes 8b and 8b '.
【００４４】そして、（ａ）測定酸液収容槽５ａに供給
された検定用酸液９ａ’、および希釈液収容槽５ｂに供
給された希釈液９ｂそれぞれの水頭位置を同一とした場
合に、電磁濃度計２の表示部４ａの指示値が、この電磁
濃度計２の測定精度保証域の上限値（本実施形態では１
５％）付近の値となるように、検定用酸液９ａ’を排出
する配管６ａと、希釈液を排出する配管６ｂとのそれぞ
れの内径に差を設けること、または（ｂ）測定酸液収容
槽５ａに供給された検定用酸液９ａ’、および希釈液収
容槽５ｂに供給された希釈液９ｂそれぞれの水頭位置を
異ならせた場合に、電磁濃度計２の表示部４ａの指示値
が、この電磁濃度計２の測定精度保証域の上限値である
１５％付近の値となるように、オーバーフロー配管８
ａ、８ｂの設置高さを互いに異ならせることにより、粗
調整が行われる。この粗調整により、４０％の酸濃度を
有する検定用酸液９ａ’が、例えば１４〜１６％程度の
酸濃度を有する希釈酸液１３ａ’に薄められるのである
から、この際の希釈比ｘは、例えば２．５０〜２．８６
程度となる。(A) When the head positions of the test acid solution 9a 'supplied to the measurement acid solution storage tank 5a and the diluting solution 9b supplied to the diluting solution storage tank 5b are the same, The indicated value on the display unit 4a of the densitometer 2 is equal to the upper limit value of the measurement accuracy assurance range of the electromagnetic densitometer 2 (1 in this embodiment).
5%), a difference is provided between the inner diameters of the pipe 6a for discharging the test acid solution 9a 'and the pipe 6b for discharging the diluting liquid, or (b) storing the measured acid solution. When the head positions of the test acid solution 9a ′ supplied to the tank 5a and the diluent 9b supplied to the diluent storage tank 5b are changed, the indicated value on the display unit 4a of the electromagnetic concentration meter 2 becomes The overflow pipe 8 is set so as to have a value in the vicinity of 15%, which is the upper limit of the measurement accuracy assurance range of the electromagnetic densitometer 2.
By making the installation heights of a and 8b different from each other, coarse adjustment is performed. As a result of this coarse adjustment, the test acid solution 9a 'having an acid concentration of 40% is diluted to a diluted acid solution 13a' having an acid concentration of, for example, about 14 to 16%. , For example, 2.50 to 2.86
About.
【００４５】さらに、水頭差式希釈装置３による希釈比
は、第２段階である微調整を行われて、最終的な希釈比
ｘ’として設定される。Further, the dilution ratio by the head difference type dilution device 3 is finely adjusted in the second stage, and is set as a final dilution ratio x '.
【００４６】この微調整は、配管６ａ、６ｂそれぞれに
設けられた流量調整弁１０ａ、１０ｂの開度を、表示部
４ａに表示される希釈酸液１３ａ’の酸濃度が正確に１
５％に一致するように、調整する「合わせ込み」を行う
ことにより、表示部４ａの指示値を、この電磁濃度計２
の測定精度保証域の上限値である１５％に可及的正確に
一致させる。そして、一致したときの流量調整弁１０
ａ、１０ｂの開度に固定して、微調整を終了する。この
微調整により、４０％の酸濃度が１５％に薄められるの
であるから、この際の希釈比ｘ’は、４０／１５＝２．
６６６６となる。この微調整を終了した後に、検定用酸
液９ａ’を排出する。In this fine adjustment, the opening degree of the flow control valves 10a and 10b provided in the pipes 6a and 6b, respectively, is adjusted so that the acid concentration of the dilute acid solution 13a 'displayed on the display unit 4a is exactly 1.
By performing “adjustment” to adjust so as to coincide with 5%, the indicated value on the display unit 4 a is read from the electromagnetic densitometer 2.
As high as possible to the upper limit value of 15% of the measurement accuracy assurance range. Then, when the flow rate is matched, the flow control valve 10
The fine adjustment is finished by fixing the opening degrees of a and 10b. By this fine adjustment, the acid concentration of 40% is reduced to 15%, and the dilution ratio x 'at this time is 40/15 = 2.
6666. After finishing the fine adjustment, the test acid solution 9a 'is discharged.
【００４７】これにより、希釈比ｘ’の精度が、工業用
計器として要求される精度：Ｆｓ±０．２５〜０．５０
を充分に満足する程度に維持される。このため、混合槽
７に収容された希釈酸液１３ａの希釈比ｘ’の設定精度
および再現性をいずれも充分に確保できる。As a result, the precision of the dilution ratio x 'is the precision required for an industrial instrument: Fs ± 0.25 to 0.50
Is maintained to a satisfactory degree. Therefore, both the setting accuracy and the reproducibility of the dilution ratio x 'of the diluted acid solution 13a contained in the mixing tank 7 can be sufficiently ensured.
【００４８】このようにして、混合槽７に収容される希
釈酸液１３ａの希釈比ｘ’を所望の値に調整できる。Thus, the dilution ratio x 'of the diluted acid solution 13a contained in the mixing tank 7 can be adjusted to a desired value.
【００４９】そして、流量調整弁１０ａ、１０ｂの開度
を、「合わせ込み」により決定された開度に固定して、
測定酸液収容槽５ａに酸液９ａを供給し、この測定酸液
９ａ、および希釈液収容槽５ｂに供給された希釈液９ｂ
の混合が行われる。これにより、混合槽７内に収容され
た希釈酸液１３ａの酸濃度は、０％以上１５％以下に正
確に調整される。Then, the openings of the flow control valves 10a and 10b are fixed to the openings determined by the “fitting”,
The acid solution 9a is supplied to the measurement acid solution storage tank 5a, and the measurement acid solution 9a and the diluent 9b supplied to the diluent solution storage tank 5b are supplied.
Is performed. Thereby, the acid concentration of the diluted acid solution 13a accommodated in the mixing tank 7 is accurately adjusted to 0% or more and 15% or less.
【００５０】この際に、混合槽７に収容された、酸濃度
が０〜１５％に希釈された希釈酸液１３ａは、電磁濃度
計２により正確に酸濃度が測定される。At this time, the acid concentration of the diluted acid solution 13 a contained in the mixing tank 7 and diluted to an acid concentration of 0 to 15% is accurately measured by the electromagnetic densitometer 2.
【００５１】すなわち、本実施形態では、図６のグラフ
に破線で示すように、測定酸液１３ａの酸濃度を、測定
精度保証域である０〜１５％に一旦希釈することによっ
て測定不能範囲ｂと、測定精度保証域ａにあるのか区別
できない測定精度保証域ｃとをともに測定精度保証域ａ
へシフトさせることにより、希釈酸液１３ａの酸濃度Ｃ
HCl を正確に測定する。そして、演算部２ｂにより、測
定酸液９ａの酸濃度を、希釈酸液１３ａの測定値ＣHCl
および希釈比ｘ’の積として、正確に算出する。That is, in the present embodiment, as shown by the broken line in the graph of FIG. 6, the acid concentration of the measurement acid solution 13a is once diluted to 0 to 15%, which is the measurement accuracy guarantee range, so that the measurement impossible range b And the measurement accuracy assurance area c which cannot be distinguished from the measurement accuracy assurance area a.
To the acid concentration C of the diluted acid solution 13a.
Measure HCl accurately. Then, the arithmetic unit 2b calculates the acid concentration of the measured acid solution 9a by the measured value C HCl of the diluted acid solution 13a.
And the product of the dilution ratio x '.
【００５２】このように、本実施形態では、測定酸液９
ａの酸濃度を測定精度保証域である０％以上１５％以下
に希釈する水頭差式希釈装置３を用いている。As described above, in this embodiment, the measuring acid solution 9
A head difference type dilution device 3 for diluting the acid concentration of a to 0% or more and 15% or less, which is a measurement accuracy guarantee region, is used.
【００５３】この本実施形態の酸濃度計１は、従来の希
釈装置よりも簡素な構造であって安価かつ高精度かつ調
整容易な水頭差式希釈装置３を、公知の完成された工業
計器である電磁濃度計２とともに組み合わせて用いて構
成されており、これにより、以下に列記する効果が奏せ
られる。The acid concentration meter 1 according to the present embodiment is a simple and inexpensive, highly accurate and easily adjustable head-head type dilution device 3 that is simpler than a conventional dilution device, and is a known completed industrial instrument. It is configured to be used in combination with a certain electromagnetic densitometer 2, whereby the effects listed below can be obtained.
【００５４】（１）電磁濃度計２の狭い測定可能な範囲
を拡大できる。すなわち、本実施形態では、水頭差式希
釈装置３により、測定酸液９ａの酸濃度を電磁濃度計２
の測定精度保証域である０〜１５％に調整して導電率を
測定し、この測定値ＣHCl と図６にグラフで示す関係と
から、測定酸液９ａの酸濃度を正確に測定できる領域に
自由に制御する。これにより、本実施形態によれば、測
定酸液９ａの測定領域を０〜１５％という狭い範囲に限
定せざるを得なかった従来の電磁濃度計に比較して、電
磁濃度計２の測定可能範囲を拡大して、その能力を最大
限に拡大することができる。(1) The narrow measurable range of the electromagnetic densitometer 2 can be expanded. That is, in the present embodiment, the acid concentration of the measurement acid solution 9a is measured by the head difference type dilution device 3 using the electromagnetic concentration meter 2.
The conductivity is measured by adjusting the measurement accuracy to 0 to 15%, which is the measurement accuracy guarantee range, and from the measured value C HCl and the relationship shown in the graph of FIG. 6, the acid concentration of the measurement acid solution 9a can be accurately measured. Control freely. Thus, according to the present embodiment, the measurement of the electromagnetic densitometer 2 can be performed in comparison with the conventional electromagnetic densitometer in which the measurement region of the measurement acid solution 9a has to be limited to a narrow range of 0 to 15%. The range can be expanded to maximize its capabilities.
【００５５】本実施形態において、電磁濃度計２が測定
する０〜１５％の酸濃度は、工業用計器として測定精度
が保証されている範囲であることから、電磁濃度計２の
測定精度が向上する。In the present embodiment, the acid concentration of 0 to 15% measured by the electromagnetic densitometer 2 is within the range in which the measurement accuracy is guaranteed as an industrial instrument, so that the measurement accuracy of the electromagnetic densitometer 2 is improved. I do.
【００５６】（２）前述した手段により、混合槽７に収
容された希釈酸液１３ａの希釈比ｘ’を適宜調整するこ
とにより、酸濃度計１の測定レンジを可変に設定できる
ため、測定範囲の選択を自由に行うことができる。(2) The measurement range of the acid concentration meter 1 can be variably set by appropriately adjusting the dilution ratio x ′ of the diluted acid solution 13a contained in the mixing tank 7 by the above-described means. Can be freely selected.
【００５７】（３）著しく安価かつ簡素な水頭差式希釈
装置３を用いるため、酸濃度計１も大幅に安価に簡素化
できる。このため、既存の各種設備、例えば鋼帯の酸洗
工程へ容易に導入・適用することができる。(3) Since the remarkably inexpensive and simple head difference type dilution device 3 is used, the acid concentration meter 1 can be simplified at a significantly low cost. For this reason, it can be easily introduced and applied to existing various facilities, for example, a pickling process of a steel strip.
【００５８】（４）水頭差式希釈装置３を用いて測定酸
液９ａを希釈するため、測定酸液９ａによる各部の詰ま
りが著しく抑制される。すなわち、既存の分析計では、
塩化鉄結晶やゴミ等の不純物が多量に含有された測定酸
液９ａによる配管各部の詰まりを防止するためにフィル
ターを設置する必要があった。しかし、本実施形態で
は、水頭差式希釈装置３を用いて測定酸液９ａを希釈し
てから測定を行うため、不純物の濃度を半減または数１
０分の１程度に低減することができる。これにより、測
定酸液９ａの詰まりによる故障頻度を最小限に低減する
ことができ、長期間にわたって安定して稼働することが
できる。(4) Since the measuring acid solution 9a is diluted using the head difference type diluting device 3, clogging of each part by the measuring acid solution 9a is remarkably suppressed. That is, with existing analyzers,
It was necessary to install a filter in order to prevent the piping from being clogged with the measuring acid solution 9a containing a large amount of impurities such as iron chloride crystals and dust. However, in this embodiment, since the measurement is performed after diluting the measuring acid solution 9a using the head difference type diluting device 3, the concentration of the impurity is reduced by half or the number 1
It can be reduced to about 1/0. Thus, the frequency of failures due to clogging of the measuring acid solution 9a can be reduced to a minimum, and stable operation can be performed for a long period of time.
【００５９】なお、本実施形態においても配管各部の詰
まりを防止するためのフィルターを設置してもよいが、
これにより、フィルターの寿命延長を図ることもでき
る。In this embodiment, a filter for preventing clogging of each part of the pipe may be provided.
Thereby, the life of the filter can be extended.
【００６０】（５）測定酸液収容槽５ａおよび希釈液収
容槽５ｂにそれぞれオーバーフロー配管８ａ、８ａ’、
８ｂ、８ｂ’を設置して、測定酸液収容槽５ａに供給さ
れた測定酸液９ａ、および希釈液収容槽５ｂに供給され
た希釈液９ｂそれぞれの水頭位置の変動を抑制するた
め、高い精度で希釈比ｘ’を安定化させることができ
る。(5) The overflow pipes 8a and 8a 'are provided in the measurement acid solution storage tank 5a and the diluent storage tank 5b, respectively.
8b and 8b 'are installed to suppress fluctuations in the water head position of each of the measurement acid solution 9a supplied to the measurement acid solution storage tank 5a and the diluent 9b supplied to the diluent solution storage tank 5b. Can stabilize the dilution ratio x ′.
【００６１】（６）酸濃度計１の全体の測定を、電磁濃
度計２の測定精度よりも向上して、高精度の濃度計測が
可能となる。すなわち、本実施形態の酸濃度計１の総合
の測定精度は、√｛（測定酸液収容槽５ａにおける水頭
位置の変動量）2 ＋（希釈液収容槽５ｂにおける水頭位
置の変動量）2 ＋（電磁濃度計２の誤差）2 ｝として求
められるが、図２における高さＨ’、水頭高さＨをいず
れも適宜設定することにより、この式における第１項〜
第３項は、いずれも、工業計器として要求される精度で
あるＦｓ±０．０２５〜０．０５０を充分に満足する程
度に抑制されるため、極めて高精度で濃度計測が可能と
なる。例えば、Ｈ’＝５ｍｍ、Ｈ＝３００ｍｍと設定す
ると、上記の第１項および第２項はともに±５／３００
≒±０．０１７となり、また第３項は±０．０３であ
る。このため、総合の測定精度は、約０．０３８とな
る。これは、電磁濃度計２の誤差と略同程度である。(6) The overall measurement of the acid concentration meter 1 is improved more than the measurement accuracy of the electromagnetic concentration meter 2, and high-accuracy concentration measurement becomes possible. That is, the total measurement accuracy of the acid concentration meter 1 of the present embodiment is as follows: Δ (fluctuation amount of the water head position in the measuring acid solution storage tank 5a) 2 + (fluctuation amount of the water head position in the diluting liquid storage tank 5b) 2 + (Error of the electromagnetic densitometer 2) It is obtained as 2 ｝. By appropriately setting the height H ′ and the head height H in FIG.
The third term is suppressed to a level that sufficiently satisfies Fs ± 0.025 to 0.050, which is the precision required for an industrial instrument, so that concentration measurement can be performed with extremely high precision. For example, if H ′ = 5 mm and H = 300 mm, both the first and second terms are ± 5/300
≒ ± 0.017, and the third term is ± 0.03. Therefore, the total measurement accuracy is about 0.038. This is substantially the same as the error of the electromagnetic densitometer 2.
【００６２】すなわち、本実施形態の酸濃度計１は、測
定精度の設定の自由度が極めて高く、要求する測定精度
に応じて、測定精度の設定を変更できる。That is, the acid concentration meter 1 of the present embodiment has a very high degree of freedom in setting the measurement accuracy, and the setting of the measurement accuracy can be changed according to the required measurement accuracy.
【００６３】（第２実施形態）次に、第２実施形態を説
明する。なお、以降の各実施形態の説明は、前述した第
１実施形態と相違する部分について行うこととし、共通
する部分については同一の図中符号を付すことにより、
重複する説明を省略する。(Second Embodiment) Next, a second embodiment will be described. In the following, each embodiment will be described with respect to portions different from the above-described first embodiment, and common portions will be denoted by the same reference numerals in the drawings.
A duplicate description will be omitted.
【００６４】図４は、第１実施形態の水頭差式希釈装置
３に換えて用いた、いわゆる計量枡方式希釈装置２０を
模式的に示す説明図である。FIG. 4 is an explanatory view schematically showing a so-called measuring-basin type diluting device 20 used in place of the head difference type diluting device 3 of the first embodiment.
【００６５】この計量枡方式希釈装置２０は、電磁弁２
１ａを介して酸液を計量枡２２ａに供給するとともに、
電磁弁２１ｂを介して希釈液を計量枡２２ｂに供給す
る。The measuring basin type diluting device 20 comprises a solenoid valve 2
While supplying the acid solution to the measuring chamber 22a via 1a,
The diluent is supplied to the measuring chamber 22b via the solenoid valve 21b.
【００６６】そして、計量枡２２ａが満杯になったこと
を電磁弁２３ａで検知して絞り弁２４ａを介して所定量
の酸液を排出するとともに、計量枡２２ｂが満杯になっ
たことを電磁弁２３ｂで検知して絞り弁２４ｂを介して
所定量の希釈液を排出し、排出された所定量の酸液およ
び希釈液を混合槽２５で充分に混合して、希釈酸液の酸
濃度を０〜１５％として電磁濃度計２６に送り、測定精
度保証域である０〜１５％の希釈酸液の酸濃度を測定す
る。The electromagnetic valve 23a detects that the measuring chamber 22a is full, discharges a predetermined amount of the acid solution through the throttle valve 24a, and detects that the measuring chamber 22b is full. A predetermined amount of the diluting liquid is discharged through the throttle valve 24b upon detection at 23b, and the discharged predetermined amount of the acid liquid and the diluting liquid are sufficiently mixed in the mixing tank 25 to reduce the acid concentration of the dilute acid liquid to 0. It is sent to the electromagnetic densitometer 26 as ％ 15%, and the acid concentration of the diluted acid solution of 0 to 15%, which is the measurement accuracy assurance area, is measured.
【００６７】そして、電磁濃度計の図示しない演算部に
より、希釈酸液の酸濃度の測定値Ｃ HCl と希釈比ｘ’と
により、測定酸液の酸濃度を求めるものである。この計
量枡方式希釈装置２０は、工業的に既に確立された測定
機器を組み合わせて用いるものであるため、第１実施形
態の水頭差式希釈装置３と同様の精度で測定酸液と希釈
液とを混合することができ、第１実施形態と同様の効果
を得ることができる。The calculation unit (not shown) of the electromagnetic densitometer
From the measured value C of the acid concentration of the diluted acid solution, HCl And the dilution ratio x '
Is used to determine the acid concentration of the measured acid solution. This meter
The volume measuring type dilution device 20 is a measurement system that has been established industrially.
The first embodiment because it uses a combination of devices
Acid solution and dilution with the same precision as the head difference type dilution device 3
Can be mixed with the liquid, and the same effect as in the first embodiment can be obtained.
Can be obtained.
【００６８】しかし、この計量枡方式希釈装置２０で
は、多数の電磁弁等を用いる必要から部品点数が多くな
り、かつ駆動部も多数存在するために、第１実施形態の
水頭差式希釈装置３に比較すると、装置故障が発生し易
い。さらに、これら多数の部品の動作を制御するための
専用の制御装置 (コントローラ) が必要となり、全体と
して相当に高価になる。However, in this measuring basin type diluting apparatus 20, the number of parts is increased due to the necessity of using a large number of solenoid valves and the like, and there are also a large number of driving parts. In comparison with the above, device failure is more likely to occur. Furthermore, a dedicated control device (controller) for controlling the operation of these many components is required, and the overall cost is considerably high.
【００６９】（第３実施形態）図５は、第１実施形態の
水頭差式希釈装置３に換えて用いた、いわゆる流量制御
方式希釈装置３０を模式的に示す説明図である。(Third Embodiment) FIG. 5 is an explanatory diagram schematically showing a so-called flow control type dilution device 30 used in place of the head difference type dilution device 3 of the first embodiment.
【００７０】この流量制御方式希釈装置３０は、減圧弁
３１および弁３２を介して測定酸液を収容槽３３に供給
し、この測定酸液を、流量センサ３４からの信号を受け
る流量コントローラ３５により制御されるポンプ３６に
より、混合槽３７に送るとともに、弁３８を介して収容
槽３９に供給された希釈液を定量切り出しポンプ４０に
より混合槽３７に送り、攪拌ポンプ４１により測定酸液
および希釈液を充分に攪拌して希釈酸液としてから、ミ
キサ４２により希釈酸液の酸濃度を０〜１５％としてか
らポンプ４３を介して電磁濃度計４４に送り、測定精度
保証域である０〜１５％に希釈された希釈酸液の酸濃度
を測定する。The flow control type diluting device 30 supplies the measured acid solution to the storage tank 33 via the pressure reducing valve 31 and the valve 32, and supplies the measured acid solution to the flow controller 35 which receives a signal from the flow sensor 34. The diluent supplied to the storage tank 39 via the valve 38 is sent to the mixing tank 37 by the fixed-rate cut-out pump 40 while being sent to the mixing tank 37 by the controlled pump 36, and the acid solution and the diluent measured by the stirring pump 41. Is sufficiently stirred to form a diluted acid solution, the acid concentration of the diluted acid solution is reduced to 0 to 15% by a mixer 42, and then sent to an electromagnetic densitometer 44 via a pump 43. The acid concentration of the diluted acid solution diluted to 1 is measured.
【００７１】そして、電磁濃度計の図示しない演算部に
より、希釈酸液の酸濃度の測定値Ｃ HCl と希釈比ｘ’と
により、測定酸液の酸濃度を求めるものである。この流
量制御方式希釈装置３０は、工業的に既に確立された測
定機器を組み合わせて用いるものであるため、第１実施
形態の水頭差式希釈装置３と同様の精度で測定酸液と希
釈液とを混合することができ、第１実施形態と同様の効
果を得ることができる。The calculation unit (not shown) of the electromagnetic densitometer
From the measured value C of the acid concentration of the diluted acid solution, HCl And the dilution ratio x '
Is used to determine the acid concentration of the measured acid solution. This style
The volume control type diluting device 30 is a measuring device that has been industrially established.
1st implementation
The measuring acid solution and the
And the same solution as in the first embodiment.
Fruit can be obtained.
【００７２】しかし、この流量制御方式希釈装置３０は
駆動部等の部品点数が多いために、第１実施形態の水頭
差式希釈装置３に比較すると、複雑化して保守性が悪化
するとともに、流量センサ３４等の繊細な部品を多用す
るために精度を保つ調整が困難であるため、設備故障の
頻度が増加し、長期間安定して稼働することが難しい。
また、専用の制御装置 (コントローラ) や高価な流量セ
ンサ３４および流量コントローラ３５、さらには専用の
流量計用演算器等が必要となり、製作費が嵩む。However, since the flow control type dilution apparatus 30 has a large number of parts such as a drive unit, the flow control type dilution apparatus 30 is complicated and deteriorates in maintainability as compared with the head difference type dilution apparatus 3 of the first embodiment. Since delicate components such as the sensor 34 are frequently used, it is difficult to adjust the accuracy to maintain the accuracy. Therefore, the frequency of equipment failure increases, and it is difficult to operate stably for a long period of time.
In addition, a dedicated control device (controller), expensive flow sensors 34 and flow controllers 35, and a dedicated flow meter calculator are required, which increases the manufacturing cost.
【００７３】また、本実施形態の流量制御方式希釈装置
３０を用いた酸濃度計の総合の測定精度は、√｛（流量
コントローラ３５および流量センサ３４からなる流量制
御装置の精度）2 ＋（ポンプ４０の精度）2 ＋（電磁濃
度計４４の精度）2 ｝として求められるが、流量制御装
置の精度は±０．０５、ポンプ４０の精度は±０．０
３、電磁濃度計４４の精度は±０．０３であるため、総
合の測定精度は、約０．０６６％となる。このことか
ら、本実施形態では、電磁濃度計４４と同程度の測定精
度は得られないことがわかる。The total measurement accuracy of the acid concentration meter using the flow control type diluting device 30 of the present embodiment is as follows: √ ｛(accuracy of the flow control device including the flow controller 35 and the flow sensor 34) 2 + (pump 40) 2 + (accuracy of the electromagnetic densitometer 44) 2 、, but the accuracy of the flow controller is ± 0.05, and the accuracy of the pump 40 is ± 0.0.
3. Since the accuracy of the electromagnetic densitometer 44 is ± 0.03, the total measurement accuracy is about 0.066%. From this, it is understood that in this embodiment, the same measurement accuracy as that of the electromagnetic densitometer 44 cannot be obtained.
【００７４】（変形形態）実施形態の説明では、酸液が
塩酸である場合を例にとった。しかし、本発明は塩酸に
は限定されず、例えば、図５のグラフに示す各種酸液
（硝酸および硫酸等）のいずれに対しても、同様に適用
される。また、本発明にかかる酸濃度計は、当然のこと
ながら、実施形態のように酸濃度計として用いることが
できるが、これとは異なり、複雑な機構を有する既存の
分析計の前処理装置の前段部位として適用することによ
り、フィルターの負荷を軽減して長期安定稼動を可能と
することもできる。具体的には、滴定式分析計の上流側
に、本発明にかかる酸濃度計を配置することにより、こ
の滴定式分析計による測定を、長期間にわたって安定し
て行うことも可能となる。(Modification) In the description of the embodiment, the case where the acid solution is hydrochloric acid is taken as an example. However, the present invention is not limited to hydrochloric acid, and is similarly applied to any of various acid solutions (such as nitric acid and sulfuric acid) shown in the graph of FIG. In addition, the acid concentration meter according to the present invention can be used as an acid concentration meter as in the embodiment, as a matter of course. By applying the filter as a front part, the load on the filter can be reduced and long-term stable operation can be achieved. Specifically, by arranging the acid concentration meter according to the present invention on the upstream side of the titrimeter, the measurement by the titrimeter can be stably performed over a long period of time.
【００７５】[0075]
【発明の効果】以上詳細に説明したように、本発明によ
り、部品点数が少ないために保守性が良好であるととも
に設備故障の頻度が少ないことから長期間安定稼働で
き、安価に製作できる酸濃度計と酸濃度測定法とを提供
することが可能となった。As described in detail above, according to the present invention, the acid concentration which can be operated stably for a long period of time because the number of parts is small, the maintenance is good and the frequency of equipment failure is small, and which can be manufactured at low cost. It has become possible to provide a meter and an acid concentration measurement method.
【００７６】特に、水頭差式希釈装置を用いて測定酸液
の希釈を行うことにより、設備コストの上昇を大幅に抑
制できるとともに、測定精度を極めて容易かつ確実に所
望の程度に設定することができる。In particular, by diluting the acid solution to be measured using a head difference type diluting apparatus, it is possible to greatly suppress an increase in equipment cost, and to set the measurement accuracy to a desired degree extremely easily and reliably. it can.
【００７７】かかる効果を有する本発明の意義は、極め
て著しい。The significance of the present invention having such effects is extremely remarkable.
【図１】第１実施形態の酸濃度計の構成の一例を模式的
に示す説明図である。FIG. 1 is an explanatory diagram schematically illustrating an example of a configuration of an acid concentration meter according to a first embodiment.
【図２】図１におけるＡ部の拡大図である。FIG. 2 is an enlarged view of a portion A in FIG.
【図３】塩酸の酸濃度と導電率との関係の一例を示すグ
ラフである。FIG. 3 is a graph showing an example of a relationship between an acid concentration of hydrochloric acid and electric conductivity.
【図４】第２実施形態で用いた、いわゆる計量枡方式希
釈装置を模式的に示す説明図である。FIG. 4 is an explanatory view schematically showing a so-called measuring basin type dilution device used in the second embodiment.
【図５】第３実施形態で用いた、いわゆる流量制御方式
希釈装置を模式的に示す説明図である。FIG. 5 is an explanatory view schematically showing a so-called flow control type dilution device used in the third embodiment.
【図６】塩酸の酸濃度と導電率との関係の一例を示すグ
ラフである。FIG. 6 is a graph showing an example of the relationship between the acid concentration of hydrochloric acid and the electrical conductivity.
【図７】塩酸以外の酸液について、酸濃度と導電率との
関係の一例を、塩化ナトリウムと対比させて示すグラフ
である。FIG. 7 is a graph showing an example of the relationship between the acid concentration and the electrical conductivity of an acid solution other than hydrochloric acid in comparison with sodium chloride.
１ 酸濃度計 ２ 電磁濃度計 ２ａ 測定部 ２ｂ 演算部 ３ 水頭差式希釈装置 ４ａ、４ｃ 表示部 ４ｂ 入力部 ５ａ 測定酸液収容槽 ５ｂ 希釈液収容槽 ６ａ、６ｂ 配管 ７ 混合槽 ８ａ、８ｂ オーバーフロー配管 ９ａ 測定酸液 ９ｂ 希釈液 １０ａ、１０ｂ 流量調整弁 １３ａ 希釈酸液 Reference Signs List 1 acid concentration meter 2 electromagnetic concentration meter 2a measuring unit 2b calculating unit 3 head difference type diluting device 4a, 4c display unit 4b input unit 5a measuring acid solution storage tank 5b diluent storage tank 6a, 6b piping 7 mixing tank 8a, 8b overflow Piping 9a Measured acid solution 9b Diluent 10a, 10b Flow control valve 13a Dilute acid solution
Claims (9)
電磁濃度計と、 測定対象である測定酸液を前記測定精度保証域の酸濃度
に希釈する希釈装置とを備え、 前記電磁濃度計を用いて、前記希釈装置により前記測定
精度保証域の酸濃度に希釈された希釈酸液の酸濃度を測
定することにより、前記測定酸液の酸濃度を求めること
を特徴とする酸濃度計。1. An electromagnetic densitometer having a measurement accuracy guarantee area for an acid concentration of an acid solution, and a diluting device for diluting a measurement acid solution to be measured to an acid concentration in the measurement accuracy guarantee area, Measuring the acid concentration of the diluted acid solution diluted to the acid concentration in the measurement accuracy assurance region by the diluting device using a diluter, thereby obtaining the acid concentration of the measured acid solution. .
率を測定する測定部と、該導電率の測定値および前記希
釈酸液の希釈比に基づいて、前記測定酸液の酸濃度を算
出する演算部とを有する請求項１に記載された酸濃度
計。2. An electromagnetic densitometer comprising: a measuring unit for measuring the conductivity of the diluted acid solution; and an acid concentration of the measured acid solution based on a measured value of the conductivity and a dilution ratio of the diluted acid solution. The acid concentration meter according to claim 1, further comprising a calculation unit that calculates
る請求項１または請求項２に記載された酸濃度計。3. The acid concentration meter according to claim 1, wherein the diluting device is a head difference type diluting device.
設置された測定酸液収容槽および希釈液収容槽と、該測
定酸液収容槽および希釈液収容槽それぞれに下方へ向け
て接続された二本の配管と、該二本の配管の下方に接続
されて測定酸液および希釈液を混合する混合槽とを有す
る請求項３に記載された酸濃度計。4. The head difference type diluting device according to claim 1, wherein the measuring acid solution storage tank and the diluting solution storage tank installed at substantially the same height, and the measurement acid solution storing tank and the diluting solution storage tank are respectively directed downward. The acid concentration meter according to claim 3, comprising: two connected pipes; and a mixing tank connected below the two pipes to mix the measurement acid solution and the diluent.
請求項４に記載された酸濃度計。5. The acid concentration meter according to claim 4, wherein the measuring section is provided in the mixing tank.
前記希釈液それぞれの混合比は、前記酸液収容槽に供給
された測定酸液、および前記希釈液収容槽に供給された
希釈液それぞれの水頭位置を略同一とすること、また
は、該水頭位置を異ならせることにより、調整される請
求項４または請求項５に記載された酸濃度計。6. A mixing ratio of each of the measurement acid solution and the diluent in the mixing tank is determined based on the measurement acid solution supplied to the acid solution storage tank and the diluent supplied to the diluent storage tank. The acid concentration meter according to claim 4 or 5, wherein the acid concentration is adjusted by making the water head positions substantially the same or by making the water head positions different.
記二本の配管それぞれの内径を異ならせること、および
／または、前記二本の配管にそれぞれ設けられた二つの
流量調整弁の開度をそれぞれ調整することにより、行わ
れる請求項６に記載された酸濃度計。7. Making the water head positions substantially the same means that the inner diameters of the two pipes are different, and / or the opening of two flow control valves respectively provided in the two pipes. The acid concentration meter according to claim 6, wherein the measurement is performed by adjusting respective degrees.
の測定精度保証域の酸濃度へ希釈した後、該測定精度保
証域へ希釈された希釈酸液の酸濃度を前記電磁濃度計を
用いて測定し、該電磁濃度計による測定値と前記希釈酸
液の希釈比とに基づいて、前記測定酸液の酸濃度を算出
することを特徴とする酸濃度測定法。8. An electromagnetic densitometer wherein a measurement acid solution to be measured is diluted to an acid concentration in a measurement accuracy guarantee area of an electromagnetic densitometer, and the acid concentration of the diluted acid solution diluted to the measurement accuracy guarantee area is measured by the electromagnetic concentration meter. And measuring the acid concentration of the measured acid solution based on the value measured by the electromagnetic densitometer and the dilution ratio of the diluted acid solution.
置を用いて、行われる請求項８に記載された酸濃度測定
法。9. The method for measuring an acid concentration according to claim 8, wherein the dilution of the measurement acid solution is performed using a head difference type dilution apparatus.
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|---|---|---|---|
| JP2000011988A JP3610858B2 (en) | 2000-01-20 | 2000-01-20 | Acid concentration meter and acid concentration measurement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000011988A JP3610858B2 (en) | 2000-01-20 | 2000-01-20 | Acid concentration meter and acid concentration measurement method |
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| JP2001201476A true JP2001201476A (en) | 2001-07-27 |
| JP3610858B2 JP3610858B2 (en) | 2005-01-19 |
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| JP2000011988A Expired - Fee Related JP3610858B2 (en) | 2000-01-20 | 2000-01-20 | Acid concentration meter and acid concentration measurement method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567309A (en) * | 2008-04-22 | 2009-10-28 | 株式会社平间理化研究所 | Device for blending etching solution and device for determinating concetration of etching solution |
| CN102495024A (en) * | 2010-07-26 | 2012-06-13 | 株式会社爱宕 | Salinity concentration measuring device and salinity concentration measuring method |
| KR101248213B1 (en) * | 2006-10-26 | 2013-03-28 | 가부시키가이샤 히라마 리카 켄큐쇼 | Etchant managing device |
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| KR101248213B1 (en) * | 2006-10-26 | 2013-03-28 | 가부시키가이샤 히라마 리카 켄큐쇼 | Etchant managing device |
| CN101567309A (en) * | 2008-04-22 | 2009-10-28 | 株式会社平间理化研究所 | Device for blending etching solution and device for determinating concetration of etching solution |
| KR101213108B1 (en) | 2008-04-22 | 2012-12-18 | 가부시키가이샤 히라마 리카 켄큐쇼 | Etching solution preparation apparatus and etching solution concentration measurement apparatus |
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| CN102495024B (en) * | 2010-07-26 | 2015-03-11 | 株式会社爱宕 | Salinity concentration measuring device and salinity concentration measuring method |
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| Publication number | Publication date |
|---|---|
| JP3610858B2 (en) | 2005-01-19 |
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