JPH03130653A - Conductivity measuring apparatus having measured temperature correcting circuit - Google Patents
Conductivity measuring apparatus having measured temperature correcting circuitInfo
- Publication number
- JPH03130653A JPH03130653A JP26752989A JP26752989A JPH03130653A JP H03130653 A JPH03130653 A JP H03130653A JP 26752989 A JP26752989 A JP 26752989A JP 26752989 A JP26752989 A JP 26752989A JP H03130653 A JPH03130653 A JP H03130653A
- Authority
- JP
- Japan
- Prior art keywords
- conductivity
- output
- sensor
- temperature
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000012937 correction Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 10
- 230000010354 integration Effects 0.000 description 4
- 239000008235 industrial water Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、工業用水、汚水、その他の流体の導電率を測
定する導電率測定装置に関し、特に被測定流体の温度変
化が急速な場合にも、安定した温度補正動作を行なう測
定値温度補正回路付き導電率測定装置に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a conductivity measuring device for measuring the conductivity of industrial water, sewage, and other fluids, particularly when the temperature of the fluid to be measured is rapidly changing. The present invention also relates to a conductivity measuring device with a measured value temperature correction circuit that performs stable temperature correction operation.
（従来の技術）
従来、液体の導電率を測定する装置として、第２図に示
すような複数の電極６ａ、６ｂを持つ電極棒５と泡抜き
孔７ａを有するセル外筒７との間に円筒状の被測定流体
空間を形成し、前記空間の流体の導電率を検知する導電
率センサの出力を、前記電極の近くに配置した温度セン
サ２の出力によって摂氏２５度における導電率値に補正
して出力する装置が知られている。(Prior Art) Conventionally, as a device for measuring the electrical conductivity of a liquid, as shown in FIG. A cylindrical fluid space to be measured is formed, and the output of a conductivity sensor that detects the conductivity of the fluid in the space is corrected to a conductivity value at 25 degrees Celsius by the output of a temperature sensor 2 placed near the electrode. There are known devices that output the following information.
そして、その補正方法は、第５図に示す温度補正回路を
含む導電率センサ１０に温度センサを一体に組み込み、
ブリッジ回路などにより、導電率センサ出力の変化と温
度センサ出力の変化が互いに打ち消すようにして、温度
補正された信号波形として増幅回路１１に送り、これを
増幅して測定出力としている。The correction method includes integrally incorporating a temperature sensor into a conductivity sensor 10 including a temperature correction circuit shown in FIG.
Using a bridge circuit or the like, changes in the conductivity sensor output and changes in the temperature sensor output cancel each other out, and are sent to the amplifier circuit 11 as a temperature-corrected signal waveform, which is amplified and used as a measurement output.
（発明が解決しようとする課題）
導電率は電気の通りやすさを示すものであるから、導電
率測定は、逆数関係にある抵抗値を測定することに他な
らない。(Problems to be Solved by the Invention) Since electrical conductivity indicates the ease with which electricity passes, measuring electrical conductivity is nothing but measuring a resistance value that is in a reciprocal relationship.
したがって、流体の導電率測定装置でも、流体、の２点
間の抵抗値を測定するが、抵抗値は温度変化とともに変
わるので、一般に基準となる摂氏２５度の導電率に補正
して表示することになっている。Therefore, a fluid conductivity measurement device measures the resistance value between two points in the fluid, but since the resistance value changes with temperature changes, it is generally corrected to the standard conductivity of 25 degrees Celsius and displayed. It has become.
一方、測定の対象として厳格な監理を要する工業用水な
どでは、冷却水、あるいは工場処理の過程で暖められた
液体が、常温の同一液体と相前後して急速に放出される
ことがしばしばある。On the other hand, in industrial water systems that require strict monitoring, cooling water or liquids that have been warmed during factory processing are often rapidly released in tandem with the same liquid at room temperature.
ところが従来の導電率測定装置は、導電率センサの出力
を温度センサの出力で直接補正しているので、均一な流
体の導電率測定中に流体の温度が急速に変化した場合、
抵抗値はこれに追従して急速に変化するが、温度センサ
の出力は直ぐには追従しないで、適正値にゆっくり近づ
く。However, in conventional conductivity measuring devices, the output of the conductivity sensor is directly corrected by the output of the temperature sensor, so if the temperature of the fluid changes rapidly during conductivity measurement of a homogeneous fluid,
The resistance value follows this and changes rapidly, but the output of the temperature sensor does not follow this immediately, but slowly approaches the appropriate value.
この追従の遅れは、温度センサを構成する各部の熱伝導
率、熱抵抗、比熱、形状によって異なる。This follow-up delay varies depending on the thermal conductivity, thermal resistance, specific heat, and shape of each part constituting the temperature sensor.
例えば、第４図（ａ）のような被測定流体の温度変化が
あったとき、温度センサの出力が第４図（ｂ）のようで
あったとすると、導電率センサの出力は、第４図（Ｃ）
に実線で示すように流体の温度変化に直ちに追従するの
で、補正された測定値は、第４図（ｄ）の２点鎖線で示
すように、流体の温度変化を微分したような波形となる
。For example, when there is a temperature change in the measured fluid as shown in Figure 4(a), and the output of the temperature sensor is as shown in Figure 4(b), the output of the conductivity sensor is as shown in Figure 4(a). (C)
As shown by the solid line, the corrected measurement value immediately follows the temperature change of the fluid, so the corrected measurement value has a waveform that looks like the differentiation of the temperature change of the fluid, as shown by the two-dot chain line in Fig. 4(d). .
このように摂氏２５度に換算した実際の導電率に変化が
ないのにかかわらず、出力測定値に第４図（ｄ）の２１
点、２２点において導電率変化が許容値を越えたと判定
されて警報を出す場合は、誤報となり、工業用水などの
監視をする人々の判断と処置を謝らせることになる。In this way, even though there is no change in the actual conductivity converted to 25 degrees Celsius, the output measurement value is 21 in Figure 4 (d).
If it is determined that the change in conductivity exceeds the allowable value at point 22 and an alarm is issued, it will be a false alarm and the people who monitor industrial water will be forced to apologize for their judgment and actions.
このような欠点を防ぐ方法として、流体を少しずつかき
混ぜながらケース内に入れセンサに触れさせるとか、セ
ンサを熱容量の大きい鉄筺に入れるなどして、２１点、
２２点のピークの尖頭値を低くする方法があるが、いず
れも構造が複雑で、製作費用が高くなるという欠点があ
る。As a way to prevent these drawbacks, there are 21 points, such as stirring the fluid little by little into the case and letting it touch the sensor, or placing the sensor in an iron box with a large heat capacity.
There are methods of lowering the peak values of the 22 points, but all of them have the drawbacks of complex structures and high manufacturing costs.
本発明の目的は、このような欠点を解消し、被測定流体
の温度に急速な変化があっても、常に正しい測定値を出
力するような測定値温度補正回路付き導電率測定装置を
提供することにある。An object of the present invention is to eliminate such drawbacks and provide a conductivity measuring device with a measured value temperature correction circuit that always outputs correct measured values even if there is a rapid change in the temperature of the fluid to be measured. There is a particular thing.
（課題を解決するための手段）
前記目的を達成するため、本発明の測定値温度補正回路
付き導電率測定装置は、流体の導電率を検知する導電率
センサｌと、温度センサ２を有し、導電率センサ１の出
力と温度センサ２の出力とがら定められた基準温度にお
ける導電率を得て出方する導電率測定装置において、導
電率センサ１により検知した導電率実測値の温度補正を
行なう補正演算回路４を設け、積分回路３を通過させた
導電率センサ１の出力と温度センサ２の出力を前記補正
演算回路４に入力し、その演算結果を測定値として出力
する構成とする。(Means for Solving the Problems) In order to achieve the above object, a conductivity measuring device with a measured value temperature correction circuit of the present invention includes a conductivity sensor l for detecting the conductivity of a fluid, and a temperature sensor 2. In a conductivity measurement device that obtains and outputs the conductivity at a predetermined reference temperature from the output of the conductivity sensor 1 and the output of the temperature sensor 2, temperature correction is performed on the actual conductivity value detected by the conductivity sensor 1. A correction calculation circuit 4 is provided, and the output of the conductivity sensor 1 and the output of the temperature sensor 2, which have passed through the integration circuit 3, are input to the correction calculation circuit 4, and the calculation results are output as measured values.
（実施例）
次に、本発明の実施例について図面を参照して詳しく説
明する。(Example) Next, an example of the present invention will be described in detail with reference to the drawings.
第１図は、本発明による測定値温度補正回路付き導電測
定装置の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a conductivity measuring device with a measured value temperature correction circuit according to the present invention.
第２図は、第１図の実施例の導電率センサ１の電極棒５
と温度センサ２の配置を示す構造図である。FIG. 2 shows the electrode rod 5 of the conductivity sensor 1 of the embodiment shown in FIG.
2 is a structural diagram showing the arrangement of a temperature sensor 2. FIG.
ただし、電極棒５を覆うケース７を取り除いた状態で示
しである。However, the case 7 covering the electrode rod 5 is shown removed.
第３図は、第１図の実施例の積分回路３の一例を示す回
路図である。FIG. 3 is a circuit diagram showing an example of the integrating circuit 3 of the embodiment shown in FIG.
第４図は、第１図の実施例の各要部の出方波形例を示す
波形図である。FIG. 4 is a waveform diagram showing an example of the output waveform of each main part of the embodiment shown in FIG.
第１図に示すように、本実施例は、導電率センサ１．温
度センサ２．積分回路３．補正演算回路４とから構成さ
れている。As shown in FIG. 1, this embodiment has a conductivity sensor 1. Temperature sensor 2. Integrating circuit 3. It is composed of a correction calculation circuit 4.
補正演算回路４には、導電率センサ１の出力が積分回路
３を通して入力される一方、温度センサ２の出力はその
まま入力され、補正演算回路４の出力が、本実施例の出
力となる。The output of the conductivity sensor 1 is input to the correction calculation circuit 4 through the integration circuit 3, while the output of the temperature sensor 2 is input as is, and the output of the correction calculation circuit 4 becomes the output of this embodiment.
導電率センサ１は、第２図に示す電極棒５に設けた電ｔ
ｉ６ａ、６ｂの間の抵抗を測る図示しない内蔵の抵抗値
計測回路がら実測値をケーブル９を介して出力する。The conductivity sensor 1 includes an electric conductor provided on an electrode rod 5 shown in FIG.
An actual measured value is output via a cable 9 from a built-in resistance value measuring circuit (not shown) that measures the resistance between i6a and 6b.
温度センサ２は、電極棒５に埋め込まれ、検知した温度
に応じたレベルの出力を、ケーブル９を介して出力する
。The temperature sensor 2 is embedded in the electrode rod 5 and outputs an output via a cable 9 at a level corresponding to the detected temperature.
積分回路３は、導電率センサ１の出力がアナログ波形の
信号の場合は、第３図に示すような抵抗器Ｒとコンデン
サＣの組み合わせ、その他の積分回路が用いられる。導
電率センサ１の出力をディジタル化した後に、ディジタ
ル回路によりディジタル処理をしても良い。なお、積分
後の波形を形成する曲線の指数は、温度変化が矩形であ
ったときの温度センサ２の出力波形を形成する曲線の指
数に合致するよう回路定数あるいは２回路構成が決定さ
れる。When the output of the conductivity sensor 1 is an analog waveform signal, the integrating circuit 3 is a combination of a resistor R and a capacitor C as shown in FIG. 3, or another integrating circuit is used. After the output of the conductivity sensor 1 is digitized, it may be digitally processed by a digital circuit. Note that the circuit constant or the two-circuit configuration is determined so that the index of the curve forming the waveform after integration matches the index of the curve forming the output waveform of the temperature sensor 2 when the temperature change is rectangular.
補正演算回路４は、入力がアナログ信号であるか、ディ
ジタル信号であるかによって回路構成が決定され、積分
回路３からの入力の中に含まれる温度変化による変化分
を、温度センサ２からの入力によって打ち消すよう演算
し、その結果を出力する。The correction calculation circuit 4 has a circuit configuration determined depending on whether the input is an analog signal or a digital signal. Compute to cancel by and output the result.
例えば、均一な質の液体が流れている中に、第２図に示
す電極棒５を投入し、電極棒５とケース７の間に存在す
る液体の導電率を測定している間に、第４図（ａ）に示
すように液体温度が、時刻ｔ。For example, the electrode rod 5 shown in FIG. As shown in FIG. 4(a), the liquid temperature changes at time t.
およびｔ２において急激に変化した場合について説明す
る。このとき導電率センサ１の出力は第４図（Ｃ）の実
線で示すように、その波形は液体温度の変化の波形と相
似の形となるが、積分回路３を通すと、第４図（Ｃ）の
点線に示すように立ち上がり。A case in which there is a sudden change at t2 and t2 will be explained. At this time, the output of the conductivity sensor 1 has a waveform similar to the waveform of the liquid temperature change, as shown by the solid line in FIG. Rise as shown by the dotted line in C).
および立ち下がり遅れた波形となる。and a waveform with a delayed fall.
一方、第４図（′ｂ）に示す温度センサ２の出力波形も
、積分回路３の出力に相似の形となるので、補正演算回
路４の出力には第４図（Ｃ）の点線に波形の非直線部分
が打ち消され、第４図（ｄ）に実線に示すように、温度
変化によって影響されない正しい基準温度（摂氏２５度
）における導電率値が出力される。On the other hand, since the output waveform of the temperature sensor 2 shown in FIG. 4('b) also has a similar shape to the output of the integrating circuit 3, the output of the correction calculation circuit 4 has a waveform as shown by the dotted line in FIG. 4(C). The nonlinear portion of is canceled out, and the conductivity value at the correct reference temperature (25 degrees Celsius), which is unaffected by temperature changes, is output, as shown by the solid line in FIG. 4(d).
もし、第１図のブロック図において、従来の装置のよう
に積分回路３のない場合を考えると、補正演算回路には
第４図（ｄ）の２点鎖線で示すように、時刻Ｐ１および
Ｐ２にピーク値が現れ、誤報の原因となる。In the block diagram of FIG. 1, if we consider a case where there is no integration circuit 3 like in the conventional device, the correction calculation circuit will have time points P1 and P2 as shown by the two-dot chain line in FIG. 4(d). A peak value appears at , causing false alarms.
（発明の効果）
以上詳しく説明したように本発明の測定値温度補正回路
付き導電率測定装置は、積分回路を通した導電率センサ
出力を、導電率センサの近くに配置した温度センサの出
力によって補正することにより、被測定流体の温度の急
激な変化に際しても、出力測定値に、従来のような、実
際には無い見掛は上のピーク値が現れることがないので
、常に正しく基準温度における導電率値に補正された値
が、出力として得られるという効果がある。(Effects of the Invention) As explained in detail above, the conductivity measuring device with a measured value temperature correction circuit of the present invention converts the conductivity sensor output through the integrating circuit into the output of the temperature sensor placed near the conductivity sensor. By making the correction, even when the temperature of the fluid to be measured changes suddenly, the output measurement value will not have an apparent upper peak value that does not actually exist, which is the case in the past, so it will always be possible to accurately calculate the value at the reference temperature. This has the effect that a value corrected to the conductivity value can be obtained as an output.
したがって、本実施例を使用することにより、無用の誤
報が無くなるので、信頼性は向上し、工場用水の厳密な
監理が実行可能となるなどの効果がある。Therefore, by using this embodiment, unnecessary false alarms are eliminated, reliability is improved, and strict supervision of factory water becomes possible.
第１図は、本発明による測定値温度補正回路付き導電測
定装置の一実施例を示すブロック図である。
第２図は、第１図の実施例の導電率センサの電極棒と温
度センサの配置を示す構造図である。
第３図は、第１図の実施例の積分回路の一例を示す回路
図である。
第４図は、第１図の実施例の各要部の出力波形例を示す
波形図である。
第５図は、従来の導電率測定装置の例を示すブロック図
である。
１・・・導電率センサ
２・・・温度センサ
３・・・積分回路
４・・・補正演算回路
５・・・電極棒
６ａ、６ｂ・・・電極
７・・・ケース
１０・・・温度補正回路を含む導電率センサＩＬ・・・
増幅回路
特許出廓人 二國機械工業株式会社FIG. 1 is a block diagram showing an embodiment of a conductivity measuring device with a measured value temperature correction circuit according to the present invention. FIG. 2 is a structural diagram showing the arrangement of the electrode rod and temperature sensor of the conductivity sensor of the embodiment shown in FIG. FIG. 3 is a circuit diagram showing an example of the integrating circuit of the embodiment shown in FIG. 1. FIG. 4 is a waveform diagram showing an example of output waveforms of each main part of the embodiment of FIG. 1. FIG. 5 is a block diagram showing an example of a conventional conductivity measuring device. 1... Conductivity sensor 2... Temperature sensor 3... Integrating circuit 4... Correction calculation circuit 5... Electrode rods 6a, 6b... Electrode 7... Case 10... Temperature correction Conductivity sensor IL including circuit...
Amplifier circuit patent distributor Nikoku Kikai Kogyo Co., Ltd.
Claims (1)
度を検知する温度センサとを有し、前記導電率センサの
出力と前記温度センサの出力とから定められた基準温度
における導電率を得て出力する導電率測定装置において
、 前記導電率センサにより検知した導電率実測値の温度補
正を行なう補正演算回路を設け、積分回路を通過させた
前記導電率センサの出力と前記温度センサの出力を前記
補正演算回路に入力し、その演算結果を測定値として出
力する測定値温度補正回路付き導電率測定装置。[Scope of Claims] A conductivity sensor that detects the conductivity of a fluid and a temperature sensor that detects the temperature of the fluid, and a standard determined from the output of the conductivity sensor and the output of the temperature sensor. A conductivity measuring device that obtains and outputs conductivity at a temperature is provided with a correction calculation circuit that performs temperature correction of the actual measured value of conductivity detected by the conductivity sensor, and the output of the conductivity sensor that has passed through an integrating circuit is A conductivity measuring device with a measured value temperature correction circuit that inputs the output of the temperature sensor to the correction calculation circuit and outputs the calculation result as a measured value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26752989A JPH0682111B2 (en) | 1989-10-13 | 1989-10-13 | Conductivity measurement device with measured value temperature correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26752989A JPH0682111B2 (en) | 1989-10-13 | 1989-10-13 | Conductivity measurement device with measured value temperature correction circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03130653A true JPH03130653A (en) | 1991-06-04 |
| JPH0682111B2 JPH0682111B2 (en) | 1994-10-19 |
Family
ID=17446098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26752989A Expired - Lifetime JPH0682111B2 (en) | 1989-10-13 | 1989-10-13 | Conductivity measurement device with measured value temperature correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0682111B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009537833A (en) * | 2006-05-24 | 2009-10-29 | エーゲーオー エレクトロ・ゲレーテバウ ゲーエムベーハー | Sensor device for conductivity measurement and its operating method |
| JP2011058971A (en) * | 2009-09-10 | 2011-03-24 | Denso Corp | Liquid concentration detection device |
| US9689821B2 (en) | 2008-12-31 | 2017-06-27 | Spd Swiss Precision Diagnostics Gmbh | Conductivity measurement cell |
| JP2022505418A (en) * | 2018-10-30 | 2022-01-14 | ラ マルゾッコ エス アール エル | Active system for monitoring and filtering water in espresso coffee machines, as well as related espresso coffee machines |
-
1989
- 1989-10-13 JP JP26752989A patent/JPH0682111B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009537833A (en) * | 2006-05-24 | 2009-10-29 | エーゲーオー エレクトロ・ゲレーテバウ ゲーエムベーハー | Sensor device for conductivity measurement and its operating method |
| US9689821B2 (en) | 2008-12-31 | 2017-06-27 | Spd Swiss Precision Diagnostics Gmbh | Conductivity measurement cell |
| JP2011058971A (en) * | 2009-09-10 | 2011-03-24 | Denso Corp | Liquid concentration detection device |
| JP2022505418A (en) * | 2018-10-30 | 2022-01-14 | ラ マルゾッコ エス アール エル | Active system for monitoring and filtering water in espresso coffee machines, as well as related espresso coffee machines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0682111B2 (en) | 1994-10-19 |
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