JP2569758B2 - How to calibrate the turbidimeter - Google Patents
How to calibrate the turbidimeterInfo
- Publication number
- JP2569758B2 JP2569758B2 JP63241993A JP24199388A JP2569758B2 JP 2569758 B2 JP2569758 B2 JP 2569758B2 JP 63241993 A JP63241993 A JP 63241993A JP 24199388 A JP24199388 A JP 24199388A JP 2569758 B2 JP2569758 B2 JP 2569758B2
- Authority
- JP
- Japan
- Prior art keywords
- calibration
- value
- variation
- coefficient
- turbidimeter
- 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.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 6
- 239000012086 standard solution Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 238000011088 calibration curve Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Measuring Cells (AREA)
Description
【発明の詳細な説明】 A.産業上の利用分野 本発明は、汚水処理場などで使用して、懸濁物の濃度
を光学的に測定する浸漬形の濁度計の校正方法に関する
ものである。The present invention relates to a method for calibrating an immersion type turbidimeter for optically measuring the concentration of a suspension used in a sewage treatment plant or the like. is there.
B.発明の概要 本発明は、校正容器内の標準液に検出部の所要部分を
浸漬して零点校正、スパン校正を行う浸漬形の濁度計の
校正方法において、 信号サンプリング周期毎にアナログ信号をサンプリン
グし、過去Ｎ個のデータの変動係数を求めて、その安定
性から校正値が安定したか否かを判定することにより、 校正値の個人差をなくして校正値の安定化を図り、校
正時間の短縮と測定精度の向上を図るようにしたもので
ある。B. Summary of the Invention The present invention relates to a method of calibrating an immersion type turbidimeter for performing zero point calibration and span calibration by immersing a required portion of a detection unit in a standard solution in a calibration container, Is sampled, the coefficient of variation of the past N data is obtained, and it is determined whether or not the calibration value is stable based on the stability, thereby eliminating the individual difference of the calibration value and stabilizing the calibration value. This is to shorten the calibration time and improve the measurement accuracy.
C.従来の技術 浸漬形濁度計の構成例を第３図に示す。図中、21は検
出部、22は変換器である。前記検出部21はパイプ部と検
出器本体とからなり、検水槽23の岸面の取付台24に固定
され、前記変換器22とは検出部用ケーブル25により接続
されている。また、この検出部21にはブラシ式の洗浄器
26が並設され、洗浄器用ケーブル27により前記変換器22
に接続されている。検出器本体の検出面は、例えば散乱
光検出方式では第４図に示すように同心配置の発光面S1
と受光面S2を有しており、前記洗浄器26のブラシ26Aに
より適時ブラッシングされる。C. Prior Art FIG. 3 shows a configuration example of an immersion turbidity meter. In the figure, 21 is a detection unit, and 22 is a converter. The detection section 21 is composed of a pipe section and a detector main body, is fixed to a mounting stand 24 on the shore of a water test tank 23, and is connected to the converter 22 by a detection section cable 25. The detection unit 21 includes a brush-type cleaning device.
26 are provided side by side, and the converter 22 is
It is connected to the. For example, in the scattered light detection method, the detection surface of the detector main body has a concentrically arranged light-emitting surface S1 as shown in FIG.
And a light-receiving surface S2, and are appropriately brushed by the brush 26A of the cleaning device 26.
なお、前記変換器22は、商用電源から必要な測定電源
を得るとともに、検出部21からの検出信号を変換処理し
て濁度表示したり、変換処理の結果を監視制御室などへ
送出する機能を備えている。The converter 22 obtains a required measurement power from a commercial power supply, converts a detection signal from the detection unit 21 to display turbidity, and sends a result of the conversion processing to a monitoring control room or the like. It has.
第５図は回路構成を示すもので、発光光線をガラス窓
を通して検水中に投射する発光ダイオード31、懸濁物Ａ
による散乱光の一部を受光するフォトダイオード32、受
光信号を増幅する増幅器33、この増幅器の後段に順次位
置するフィルタ回路34及び整流回路35が検出部21に設け
られ、発光回路36、電源回路37及び変換増幅部38が変換
器22に設けられている。FIG. 5 shows a circuit configuration, in which a light emitting diode 31 for projecting emitted light rays into a sample through a glass window, a suspension A
A photodiode 32 for receiving a part of the scattered light by the amplifier, an amplifier 33 for amplifying the received light signal, a filter circuit 34 and a rectifier circuit 35 sequentially disposed at a stage subsequent to the amplifier are provided in the detection unit 21, a light emitting circuit 36, a power supply circuit. 37 and a conversion amplifier 38 are provided in the converter 22.
このような構成の濁度計は、電源投入後、第６図に示
す処理フローに従って動作する。この処理フローに零校
正、スパン校正方法が含まれている。The turbidity meter having such a configuration operates according to the processing flow shown in FIG. 6 after the power is turned on. This processing flow includes a zero calibration and a span calibration method.
また、濁度計は長期間連続的に使用されるため、検出
面の汚れ、回路素子の経時変化、電気特性の経時変化等
によって検出出力に誤差を生じることがあり、適時その
検出特性をチェックしておく必要がある。In addition, since the turbidity meter is used continuously for a long period of time, errors may occur in the detection output due to contamination of the detection surface, aging of circuit elements, aging of electrical characteristics, etc. It is necessary to keep.
校正時には、第７図に示すように校正容器41に標準液
42を満たし、この液中に検出部21の先端部（検出器本
体）を浸漬して、その時の出力が規定値となるように調
整する。校正値の決定は、校正者が表示パネルを見て値
が安定したと判断した時、スイッチを操作することによ
って行う。At the time of calibration, the standard solution is placed in the calibration container 41 as shown in FIG.
Then, the tip (detector main body) of the detection unit 21 is immersed in the liquid, and the output at that time is adjusted to a specified value. The determination of the calibration value is performed by operating a switch when the proofreader looks at the display panel and determines that the value is stable.
D.発明が解決しようとする課題 ここで問題となるのは、校正値が真に安定したかどう
かの判断基準が人により異なることである。人により判
断基準が異なれば、全く同じ校正条件で数人に校正を行
わせた時、校正値が異なる可能性が十分にあり、測定精
度に影響する。また、校正はできるだけ短時間で終了さ
せる必要があるが、安定の判断が不明確であるため、安
定状態となる以前に校正を終了させてしまったり、必要
以上に校正に時間を掛けてしまう場合がある。D. Problems to be Solved by the Invention The problem here is that the criteria for determining whether or not the calibration values are truly stable differ from person to person. If the judgment criteria differ from person to person, when several persons perform calibration under exactly the same calibration conditions, there is a good possibility that the calibration values are different, which affects the measurement accuracy. Calibration must be completed in the shortest possible time.However, if the determination of stability is unclear, the calibration may be terminated before the stable state is reached, or the calibration may take more time than necessary. There is.
本発明の目的は、校正値の個人差をなくすことがで
き、かつ高い精度での校正が可能な濁度計の校正方法を
提供することにある。An object of the present invention is to provide a method for calibrating a turbidimeter that can eliminate individual differences in calibration values and that can perform calibration with high accuracy.
E.課題を解決するための手段 本発明は、校正容器内の標準液に検出部の所要部分を
浸漬して零点校正、スパン校正を行う浸漬形の濁度計に
おいて、信号サンプリング周期毎にアナログ信号をサン
プリングし、このアナログ信号の平均値、平方和、標準
偏差、過去Ｎ個のデータの変動係数を各々計算した後、
変動係数の安定性から校正値が安定したか否かを判定す
るようにしたことを特徴とするものである。E. Means for Solving the Problems The present invention provides an immersion type turbidity meter that performs a zero point calibration and a span calibration by immersing a required part of a detection unit in a standard solution in a calibration container. After sampling the signal and calculating the average value, sum of squares, standard deviation, and coefficient of variation of the past N data,
It is characterized in that it is determined whether or not the calibration value is stable based on the stability of the variation coefficient.
F.作用 校正時に信号入力安定性判定の基準となる変動係数が
計算され、これが一定の条件を連続して所定回数満足す
ると、校正曲線が安定したと見なされ、この時の値が校
正値となる。この校正値に個人差はなく、しかも高精度
の値が速やかに求められる。F. Operation During calibration, the coefficient of variation that is the basis for signal input stability determination is calculated, and if it satisfies certain conditions continuously for a predetermined number of times, the calibration curve is considered stable and the value at this time is used as the calibration value. Become. There is no individual difference in this calibration value, and a high-precision value is quickly obtained.
G.実施例 以下、本発明を図面に示す実施例に基づいて詳細に説
明する。G. Examples Hereinafter, the present invention will be described in detail based on examples shown in the drawings.
第１図及び第２図は本発明の一実施例を示すもので、
１はアナログ信号増幅部、２はデジタル演算部、３は表
示器、21は検出部、41は校正容器、42は標準液である。1 and 2 show one embodiment of the present invention.
1 is an analog signal amplifier, 2 is a digital calculator, 3 is a display, 21 is a detector, 41 is a calibration container, and 42 is a standard solution.
前記デジタル演算部２には信号サンプリング周期Kt毎
にアナログ信号Aiを入力し、このアナログ信号の平均値
、平方和Sn、標準偏差σｎ及び過去Ｎ個の変動係数CV
nを次の各式から計算し、変動係数CVnを用いて安定性を
判定する。An analog signal Ai is input to the digital operation unit 2 at each signal sampling period Kt, and the average value, sum of squares Sn, standard deviation σn, and past N variation coefficients CV of the analog signal are input.
n is calculated from the following equations, and the stability is determined using the coefficient of variation CVn.
CVn＝σn/ 安定性の判定:CVn≦α（０＜α＜0.1） の条件をｙ回以上連続して満足した場合に第２図の校正
曲線が安定したと見なす。 CVn = σn / determination of stability: When the condition of CVn ≦ α (0 <α <0.1) is continuously satisfied for y times or more, it is considered that the calibration curve in FIG. 2 is stable.
この時、濁度計では、零またはスパンLED（発光ダイ
オード）を点滅させ、同時に表示器３に規定の電圧値を
表示するようにしている。At this time, the turbidity meter blinks a zero or span LED (light emitting diode) and simultaneously displays a specified voltage value on the display 3.
なお、α及びｙの値は、零点校正、スパン校正、フル
スケールの値や要求される校正後の測定精度を検討して
決定する。The values of α and y are determined by considering the zero point calibration, the span calibration, the full scale value, and the required measurement accuracy after calibration.
このような構成とすると、校正時に信号入力安定性判
定の基準となる変動係数CVnが計算され、 CVn≦α（０＜α＜0.1） の条件を連続してｙ回満足した場合に校正曲線が安定し
たと見なされ、この時の値が校正値となる。従って、校
正値に個人差がなくなり、短時間で高精度の濁度測定が
可能となる。With such a configuration, a variation coefficient CVn, which is a reference for signal input stability determination at the time of calibration, is calculated. When the condition of CVn ≦ α (0 <α <0.1) is continuously satisfied y times, a calibration curve is obtained. It is considered stable and the value at this time is the calibration value. Therefore, there is no individual difference in the calibration values, and highly accurate turbidity measurement can be performed in a short time.
H.発明の効果 以上のように本発明によれば、信号サンプリング周期
毎にアナログ信号をサンプリングし、過去Ｎ個のデータ
の変動係数を求めて、その安定性から校正値が安定した
か否かを判定するようにしたので、校正値の個人差をな
くすことができる。また、デジタル演算により高速、高
精度で計算することができ、校正時間の短縮と測定精度
の向上が図れる。H. Effects of the Invention As described above, according to the present invention, an analog signal is sampled every signal sampling period, a coefficient of variation of past N data is obtained, and whether or not the calibration value is stable is determined based on the stability. Is determined, it is possible to eliminate individual differences in calibration values. In addition, high-speed and high-precision calculations can be performed by digital calculation, so that calibration time can be reduced and measurement accuracy can be improved.
第１図は本発明による校正方法に用いられる濁度計の一
実施例を示すブロック図、第２図は同実施例の校正曲線
図、第３図は浸漬形濁度計の構成例を示す構成説明図、
第４図は同濁度計の検出部検出面の正面図、第５図及び
第６図は同濁度計の回路構成を示すブロック図及び処理
フロー図、第７図は校正状態を説明するための断面図で
ある。 １……アナログ増幅部、２……デジタル演算部、３……
表示器、21……検出部、22……変換器、25……ケーブ
ル、26……洗浄器、31……発光ダイオード、32……フォ
トダイオード、41……校正容器、42……標準液。FIG. 1 is a block diagram showing an embodiment of a turbidity meter used in the calibration method according to the present invention, FIG. 2 is a calibration curve diagram of the embodiment, and FIG. 3 is a configuration example of an immersion turbidity meter. Configuration explanatory diagram,
Fig. 4 is a front view of a detection surface of a detection unit of the turbidimeter, Figs. 5 and 6 are block diagrams and a processing flowchart showing a circuit configuration of the turbidimeter, and Fig. 7 illustrates a calibration state. FIG. 1 ... Analog amplification unit, 2 ... Digital operation unit, 3 ...
Indicator, 21 Detector, 22 Converter, 25 Cable, 26 Washer, 31 Light-emitting diode, 32 Photodiode, 41 Calibration container, 42 Standard solution.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−63839（ＪＰ，Ａ) 特開 昭62−256839（ＪＰ，Ａ) 特開 昭63−169539（ＪＰ，Ａ) 実開 昭60−165849（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-63839 (JP, A) JP-A-62-256839 (JP, A) JP-A-63-169539 (JP, A) 165849 (JP, U)
Claims (1)
浸漬して零点校正、スパン校正を行う濁度計の校正方法
において、信号サンプリング周期毎にアナログ信号をサ
ンプリングし、このアナログ信号の平均値、平方和、標
準偏差、過去Ｎ個のデータの変動係数を各々計算した
後、変動係数の安定性から校正値が安定したか否かを判
定するようにしたことを特徴とする濁度計の校正方法。In a turbidimeter calibration method for performing zero point calibration and span calibration by immersing a required portion of a detection unit in a standard solution in a calibration container, an analog signal is sampled at each signal sampling period. After calculating the average value, the sum of squares, the standard deviation, and the coefficient of variation of the past N data, determine whether or not the calibration value is stable from the stability of the coefficient of variation. How to calibrate the meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63241993A JP2569758B2 (en) | 1988-09-27 | 1988-09-27 | How to calibrate the turbidimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63241993A JP2569758B2 (en) | 1988-09-27 | 1988-09-27 | How to calibrate the turbidimeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0288944A JPH0288944A (en) | 1990-03-29 |
| JP2569758B2 true JP2569758B2 (en) | 1997-01-08 |
Family
ID=17082653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63241993A Expired - Fee Related JP2569758B2 (en) | 1988-09-27 | 1988-09-27 | How to calibrate the turbidimeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2569758B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2745267B2 (en) * | 1992-08-03 | 1998-04-28 | 野田通信株式会社 | Turbidity measurement method to display turbidity digitally |
| JPH0688784A (en) * | 1992-09-05 | 1994-03-29 | Horiba Ltd | Method for calibrating gas analyzer |
| EP3757547B1 (en) * | 2019-06-28 | 2022-11-23 | ABB Schweiz AG | Turbidity calibration-correction apparatus and method for an automated calibration correction |
-
1988
- 1988-09-27 JP JP63241993A patent/JP2569758B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0288944A (en) | 1990-03-29 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |