JP4701020B2 - Water quality meter that can provide temperature and humidity data - Google Patents
Water quality meter that can provide temperature and humidity data Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 104
- 238000005259 measurement Methods 0.000 claims description 102
- 238000012545 processing Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 238000003326 Quality management system Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Description
本発明は、河川や湖沼の水質調査、工業用水や工場排水などの水質調査において、液体試料のｐＨ、イオン濃度、溶存酸素量、電気伝導率などの測定に用いられる水質計に関する。 The present invention relates to a water quality meter used for measuring pH, ion concentration, dissolved oxygen amount, electrical conductivity, etc. of a liquid sample in water quality surveys of rivers and lakes, and water quality surveys of industrial water and industrial wastewater.
一般的に、ｐＨやイオン濃度などを測定する水質計は、本体前面に入力操作部と表示部を備えると共に、センサー部からの信号に基づいて演算処理を行う制御部が本体内に内蔵されている。そして、ｐＨなどの測定データは、表示部に表示ないし印字されると共に水質計本体に記憶され、あるいはパソコンなどへ測定データを出力したりしている。 Generally, a water quality meter that measures pH, ion concentration, etc. has an input operation unit and a display unit on the front surface of the main body, and a control unit that performs arithmetic processing based on a signal from the sensor unit. Yes. Measurement data such as pH is displayed or printed on the display unit and stored in the water quality meter main body, or the measurement data is output to a personal computer or the like.
上記したｐＨなどの測定データには、その測定データの管理のために、測定の日付や日時、サンプル番号やサンプルＩＤが付加されている。また、特にｐＨの測定データについては、更に校正の日付や日時、校正の条件などが付加されることが多い。尚、ｐＨ測定電極の校正は使用する標準液の温度に影響されるため、標準液の温度を測定して、得られた温度に基づいて適正なｐＨに自動的に校正する装置が知られている（特開平０５−１３３９２７号公報）。 Measurement data such as pH is added with a measurement date, date and time, a sample number, and a sample ID for management of the measurement data. Further, especially for pH measurement data, calibration date and time, calibration conditions, and the like are often added. In addition, since the calibration of the pH measuring electrode is affected by the temperature of the standard solution used, there is known a device that measures the temperature of the standard solution and automatically calibrates to an appropriate pH based on the obtained temperature. (Japanese Patent Laid-Open No. 05-133927).
最近では、それらの測定データをレポートとしてまとめる際、測定環境（室内あるいは現地）の温度や湿度もあわせて記載することが多い。しかし、従来の水質計には温湿度の測定機能が備わっていいないため、測定環境の温度や湿度をそれぞれ別途測定しなければならず、その測定結果を水質計に取り込んで表示ないし記憶させ又は印刷させることも不可能であった。 Recently, when collecting these measurement data as a report, the temperature and humidity of the measurement environment (indoor or on-site) are often described together. However, since the conventional water quality meter does not have a temperature and humidity measurement function, the temperature and humidity of the measurement environment must be measured separately, and the measurement results are taken into the water quality meter for display, storage or printing. It was impossible to make it happen.
尚、発光分光分析装置では、周囲の温度変化により焦点のずれが生じ、これが測定精度を低下させることが知られている。従って、発光分光分析装置のような分析装置では、周囲の温度を測定し、周囲温度の一定時間あたりの変化量を測定者に知らせることによって、不安定要因を事前に察知するようにした装置も知られている（特開平１１−１６６８６４号公報）。 Note that it is known that in an emission spectroscopic analyzer, a focus shift occurs due to a change in ambient temperature, which reduces measurement accuracy. Therefore, in an analyzer such as an emission spectroscopic analyzer, there is an apparatus that detects the instability factor in advance by measuring the ambient temperature and notifying the measurer of the amount of change in the ambient temperature per fixed time. Known (Japanese Patent Laid-Open No. 11-166864).
近年、安定した品質の製品やサービスを顧客に提供するため、品質マネジメントシステムＩＳＯ９０００の取得が増えている。このＩＳＯ９０００によれば、製品要求事項への適合を達成するために必要な作業環境を明確にし、管理することが規定されている。そのため、水質の測定においても、作業環境の代表である測定時の雰囲気温度・湿度などの測定と管理は欠かせない事項となっている。 In recent years, in order to provide customers with stable quality products and services, the acquisition of the quality management system ISO9000 has increased. This ISO 9000 stipulates that the work environment necessary for achieving conformity to product requirements is clarified and managed. Therefore, measurement and management of the atmospheric temperature and humidity at the time of measurement, which are representative of the work environment, are also indispensable matters in water quality measurement.
同様に品質管理の向上を目指して、幾つかの制度が実施されている。例えば、「化学物質の審査及び製造等の規制に関する法律」では、試験成績の信頼性の確保を目的として優良試験所規範制度が導入されている。また、「新規化学物質等に係る試験を実施する実施施設に関する基準」では、最終報告書に記載しなければならない項目として試験成績の信頼性に影響を及ぼしたと思われる環境要因が挙げられ、その代表的なものが測定時の雰囲気温度であると考えられている。更に、水道水質検査優良試験所規範には、水質検査に支障を生じない温度、湿度などの環境条件に関する事項にも注意すべきことが規定されている。 Similarly, several systems have been implemented with the aim of improving quality control. For example, in the “Law Concerning the Regulation of Chemical Substance Examination and Manufacturing”, a good laboratory standard system is introduced for the purpose of ensuring the reliability of test results. In addition, the “Standards for Facilities for Conducting Tests Related to New Chemical Substances, etc.” lists environmental factors that may have affected the reliability of test results as items that must be included in the final report. A representative one is considered to be the ambient temperature at the time of measurement. Furthermore, the Standards for Good Water Quality Tests stipulate that attention should be paid to matters related to environmental conditions such as temperature and humidity that do not interfere with water quality tests.
しかしながら、従来の水質計には、測定環境の温度や湿度を測定する機能を備えたものは存在しなかった。そこで、現在では、水質計により測定したｐＨなどの測定データとは別に、測定環境である現場や室内の温度及び湿度を温度計や湿度計を用いて別途測定し、その結果をｐＨなどの水質測定データのレポートに付記している現状である。 However, no conventional water quality meter has a function of measuring the temperature and humidity of the measurement environment. Therefore, at present, separately from measurement data such as pH measured by a water quality meter, the temperature and humidity in the measurement environment such as the site or room are separately measured using a thermometer or hygrometer, and the results are measured as water quality such as pH. It is the current situation that is appended to the measurement data report.
一方、従来から、上記した測定環境雰囲気の温度や湿度は、一般的なｐＨ計を含めた水質計による測定データに影響を及ぼすことはないとされていた。しかし最近では、精度管理機能を中心とした水質計の高機能化の要求もあり、例えば高性能のｐＨ計では測定環境雰囲気の温度などがｐＨの測定データに与える影響も注目されつつある。 On the other hand, conventionally, the temperature and humidity of the measurement environment atmosphere described above do not affect measurement data obtained by a water quality meter including a general pH meter. Recently, however, there has been a demand for higher functionality of a water quality meter centered on an accuracy control function. For example, in a high-performance pH meter, the influence of the temperature of the measurement environment atmosphere on pH measurement data is also drawing attention.
本発明は、このような従来の事情に鑑みてなされたものであり、ｐＨなどの水質の測定と共に、その測定環境における雰囲気の温湿度を測定することができ、その測定結果を水質計に取り込んで表示・記憶又は印刷することも可能な水質計を提供することを目的とする。更に、本発明は、測定した測定環境雰囲気の温度を用いることにより、従来よりも測定精度の向上を図った水質計を提供することを目的とするものである。 The present invention has been made in view of such conventional circumstances, and can measure the temperature and humidity of the atmosphere in the measurement environment together with the measurement of water quality such as pH, and incorporate the measurement result into the water quality meter. The purpose is to provide a water quality meter that can be displayed, memorized or printed. Furthermore, an object of the present invention is to provide a water quality meter in which the measurement accuracy is improved as compared with the prior art by using the measured temperature of the measurement environment atmosphere.
上記目的を達成するため、本発明が提供する水質計は、液体試料の少なくともｐＨを測定する水質計であって、水質計本体に固定又は着脱可能に設けるか若しくは水質計本体と有線又は無線で接続可能に設けた温湿度測定ユニットを備え、液体試料の水質の測定と同時に、その測定環境における雰囲気の温度と湿度を測定でき、測定環境における雰囲気の温度測定データに基づいて、水質計本体に内蔵されている水質測定処理用の電気回路の温度ドリフトを補正することを特徴とする。 In order to achieve the above object, the water quality meter provided by the present invention is a water quality meter that measures at least the pH of a liquid sample, and is provided in the water quality meter body so as to be fixed or detachable, or wired or wirelessly connected to the water quality meter body. A temperature / humidity measurement unit is provided so that it can be connected, and the temperature and humidity of the atmosphere in the measurement environment can be measured simultaneously with the measurement of the water quality of the liquid sample. It is characterized by correcting the temperature drift of the built-in electrical circuit for water quality measurement processing .
上記本発明の水質計においては、測定環境における雰囲気の温湿度測定データを、液体試料の水質の測定データと共に水質計本体に表示し、記憶し、印刷出力する各処理のうち、少なくとも１つの処理を行うことが好ましい。 In the water quality meter of the present invention, the temperature and humidity measurement data atmosphere in the measurement environment, and displays the water quality monitor main body together with the measurement data of the water quality of the liquid sample, and stores, among the processes to be printed out, at least one processing It is preferable to carry out.
また、上記本発明における水質計は、その本体の内部にさらに温度測定器を備えてもよく、液体試料の水質の測定及びその測定環境における雰囲気の温湿度の測定と同時に、水質計本体内部の温度をさらに測定し、該水質計本体内部の温度測定データに基づいて、水質計本体に内蔵されている水質測定処理用の電気回路の温度ドリフトを補正することができる。
Further, the water quality monitor in the present invention may further comprise a temperature measuring device within the body, simultaneously with the measurement of the temperature and humidity of the atmosphere in the measurement and the measurement environment water quality of the liquid sample, the internal water gauge body The temperature can be further measured, and the temperature drift of the electrical circuit for water quality measurement processing built in the water quality meter body can be corrected based on the temperature measurement data inside the water quality meter body.
本発明によれば、ｐＨなどの水質の測定と共に、その測定環境における雰囲気の温度と湿度を自動的に測定できる水質計を提供することができる。従って、測定環境雰囲気の温度や湿度を別途測定する必要がなくなるうえ、その測定環境雰囲気の温湿度測定データを水質計に取り込み、水質測定データに付して印刷出力すれば、試験成績の品質管理及び信頼性確保に資することができる。 ADVANTAGE OF THE INVENTION According to this invention, the water quality meter which can measure the temperature and humidity of the atmosphere in the measurement environment automatically can be provided with measurement of water quality, such as pH. Therefore, there is no need to separately measure the temperature and humidity of the measurement environment atmosphere, and the temperature and humidity measurement data of the measurement environment atmosphere is taken into the water quality meter, and is attached to the water quality measurement data and printed out. And contribute to ensuring reliability.
また、本発明の水質計では、水質と共に測定した測定環境雰囲気あるいは水質計本体内部の温度測定データを用いることによって、水質計本体に内蔵されている水質測定処理用の電気回路の温度ドリフトを補正することができるため、従来よりもｐＨなどの水質測定データの精度向上を図ることが可能である。 In the water quality meter of the present invention, the temperature drift of the electrical circuit for water quality measurement processing built in the water quality meter body is corrected by using the measurement environment atmosphere measured together with the water quality or the temperature measurement data inside the water quality meter body. Therefore, it is possible to improve the accuracy of water quality measurement data such as pH as compared with the prior art.
本発明の水質計は、液体試料のｐＨ、イオン濃度、溶存酸素量、電気伝導率などを測定する本来の水質計としての機能と共に、その水質測定を行う室内あるいは屋外現場における測定環境雰囲気の温度と湿度を測定するための温湿度測定ユニットを備えている。使用する温湿度測定ユニットは、水質計本体の一部に取り付け可能な形態であって、周囲の温度及び湿度を測定できるものであれば特に制限はない。 The water quality meter of the present invention has a function as an original water quality meter for measuring pH, ion concentration, dissolved oxygen amount, electrical conductivity, etc. of a liquid sample, and the temperature of the measurement environment atmosphere in the indoor or outdoor site where the water quality is measured. And equipped with a temperature and humidity measurement unit for measuring humidity. The temperature / humidity measuring unit to be used is not particularly limited as long as it can be attached to a part of the main body of the water quality meter and can measure the ambient temperature and humidity.
例えば、図１は本発明の水質計の一具体例を示すものであり、水質計本体１の前面に入力操作部２と表示部３を備えると共に、センサー部４からの信号に基づいて演算処理を行う制御部が水質計本体１内に内蔵されている。そして、水質計本体１の一部には、測定環境雰囲気の温度と湿度を測定するための温湿度測定ユニット５が取り付けてある。温湿度測定ユニット５は、図１に示すように水質計本体１の一部に固定して又は着脱可能に設けてもよいし、水質計本体１に対して有線又は無線で接続可能に設けることもできる。
For example, FIG. 1 shows a specific example of the water quality meter of the present invention. The water quality meter
尚、水質計本体１の入力操作部２には複数の操作ボタンが設けてあり、これらの操作ボタンは操作キーシートのように一まとめにされている場合が多い。これらの操作ボタンには予め特定の機能が割り当てられ、例えば図１においては、ＣＡＬボタンは校正操作、ＭＥＮＵボタンは測定条件の設定操作、ＥＮＴＥＲボタンは設定や操作の決定、ＣＬＥＡＲボンタンはデータの消去やエラーの解除の機能などがそれぞれ設定されている。
The
また、上記した本発明の水質計においては、水質測定時における測定環境雰囲気の温度と湿度の管理範囲を、操作ボタンを用いて予め又は後から任意に設定することもできる。その場合、水質測定時における測定環境雰囲気の温度及び湿度のいずれかが設定された管理範囲外にあるときには、その温度又は湿度の管理範囲からのズレを表示したり、あるいは警報を発したりすることも可能である。 In the water quality meter of the present invention described above, the temperature and humidity management range of the measurement environment atmosphere at the time of water quality measurement can be arbitrarily set in advance or later using the operation buttons. In that case, when either the temperature or humidity of the measurement environment atmosphere at the time of water quality measurement is outside the set control range, a deviation from the control range of the temperature or humidity should be displayed or an alarm should be issued. Is also possible.
上記した測定環境雰囲気の温度と湿度を測定するための温湿度測定ユニットを備えた本発明の水質計では、通常のごとくｐＨなどの水質測定を実施できるだけでなく、その測定環境における雰囲気の温度と湿度を測定することができる。得られた測定環境雰囲気の温湿度測定データは、液体試料の水質測定データと共に水質計に取り込んで、水質計本体に表示したり、記憶したり、あるいは印刷出力することができる。 In the water quality meter of the present invention equipped with the temperature and humidity measurement unit for measuring the temperature and humidity of the measurement environment atmosphere described above, not only can the water quality measurement such as pH be performed as usual, but also the temperature of the atmosphere in the measurement environment and Humidity can be measured. The obtained temperature / humidity measurement data of the measurement environment atmosphere can be taken into the water quality meter together with the water quality measurement data of the liquid sample, and displayed on the water quality meter body, stored, or printed out.
例えば、水質計の表示部に、図２に示すように、ｐＨ、試料番号、試料液温度などの水質測定データ、測定日時や校正日時などと共に、測定環境雰囲気の温度（図では２３.５℃）及び湿度（図では４８％）を温湿度測定データとして表示する。また、水質計の印字装置によって、これらの表示内容と同様の内容を印刷出力することもできる。この測定環境雰囲気の温湿度測定データを水質測定データに付記することによって、品質マネジメントシステムＩＳＯ９０００や水道水質検査優良試験所規範その他の基準に容易に準拠でき、試験成績の品質管理及び信頼性確保に寄与することができる。 For example, on the display unit of the water quality meter, as shown in FIG. 2, together with water quality measurement data such as pH, sample number, sample solution temperature, measurement date and time, calibration date and time, etc., the temperature of the measurement environment atmosphere (in the figure, 23.5 ° C. ) And humidity (48% in the figure) are displayed as temperature and humidity measurement data. In addition, the display device of the water quality meter can print out the same contents as these display contents. By appending the temperature and humidity measurement data of this measurement environment atmosphere to the water quality measurement data, the quality management system ISO9000, tap water quality inspection excellent laboratory standard and other standards can be easily complied with, and quality control of test results and ensuring reliability Can contribute.
更に、本発明者らの研究によれば、高分解能を有する水質計、特に０.００１ｐＨクラスの高分解能表示が可能なｐＨ計においては、測定環境雰囲気の温度が水質測定データに対して無視できない影響を及ぼすことが分かった。即ち、一般にｐＨ電極からの入力電位は、増幅器、マルチプレクサ、Ａ／Ｄ変換器、ＣＰＵ回路などを経て、ｐＨ値として表示部に表示される。その際、演算処理を行うＣＰＵ回路などを含む制御部の電気回路が温度による影響を受け、入力電位やｐＨ値の処理に誤差を生じる（温度ドリフト）ことが確認された。 Furthermore, according to the study by the present inventors, in a water quality meter having a high resolution, particularly a pH meter capable of high resolution display of 0.001 pH class, the temperature of the measurement environment atmosphere cannot be ignored for the water quality measurement data. It turns out that it affects. That is, generally, the input potential from the pH electrode is displayed on the display unit as a pH value via an amplifier, a multiplexer, an A / D converter, a CPU circuit, and the like. At that time, it was confirmed that the electric circuit of the control unit including the CPU circuit for performing the arithmetic processing is influenced by the temperature, and an error occurs in the processing of the input potential and the pH value (temperature drift).
このような温度ドリフトに対して、上記した本発明の水質計では、測定環境雰囲気の温度測定データを用いて、水質計本体に内蔵されている水質測定処理用の電気回路に対する温度の影響を排除することができる。例えば、ｐＨ電極からの入力電位あるいは入力電位から求めるｐＨ値と、その測定環境雰囲気の温度との関係を予め調べ、得られた関係を制御部に記憶しておき、この関係に基づいて実際に測定した際の入力電位あるいはｐＨ値について温度ドリフトを補正する。その結果、特に０.００１ｐＨクラスの高分解能表示が可能なｐＨ計について、従来よりも水質測定データの精度向上を図ることができる。 With respect to such temperature drift, the above-described water quality meter of the present invention eliminates the influence of temperature on the electrical circuit for water quality measurement processing built in the water quality meter body using the temperature measurement data of the measurement environment atmosphere. can do. For example, the relationship between the input potential from the pH electrode or the pH value obtained from the input potential and the temperature of the measurement environment atmosphere is examined in advance, and the obtained relationship is stored in the control unit. The temperature drift is corrected for the input potential or pH value at the time of measurement. As a result, the accuracy of the water quality measurement data can be improved as compared with the conventional pH meter capable of high resolution display of 0.001 pH class.
かかる温度ドリフトは、上記した測定環境雰囲気の温度だけでなく、制御部の電気回路が存在する水質計本体の内部の温度とも関係している。従って、本発明の水質計においては、上記のごとく温湿度測定ユニットによって測定環境雰囲気の温湿度を測定するだけでなく、更に水質計本体の内部の温度も温度測定器により測定して、その両方の温度又はいずれか片方の温度を用いて上記温度ドリフトを補正することも可能である。 Such temperature drift is related not only to the temperature of the measurement environment atmosphere described above but also to the temperature inside the water quality meter main body where the electric circuit of the control unit exists. Therefore, in the water quality meter of the present invention, not only the temperature and humidity of the measurement environment atmosphere is measured by the temperature and humidity measurement unit as described above, but also the temperature inside the water quality meter body is also measured by the temperature measuring device. It is also possible to correct the temperature drift by using one of these temperatures or one of the temperatures.
測定環境雰囲気の温湿度と共に、水質計本体の内部の温度を測定する機能を備えた水質計の一例を、図３に示す。水質計本体１の一部にコネクタ７が設けてあり、このコネクタ７の水質計本体１の内部側に温度測定器６が、及び外部側には温湿度測定ユニット５がそれぞれ取り付けられている。図中の８は、センサー部からの信号に基づいて演算処理を行う制御部を構成する本体内回路基板である。この水質計によれば、通常の水質測定と共に、温湿度測定ユニット５により測定環境雰囲気の温湿度を測定し、更には温度測定器６によって水質計本体１の内部の温度を測定することができる。
An example of a water quality meter having a function of measuring the temperature inside the water quality meter body together with the temperature and humidity of the measurement environment atmosphere is shown in FIG. A
ｐＨ計（東亜ディーケーケー（株）製、ＩＭ−５５Ｇ）について、測定環境雰囲気の温度と入力電位及びｐＨの表示値の関係を求めて、ｐＨ計の温度ドリフトを評価した。即ち、周囲の室内雰囲気温度が０℃、２３℃及び４０℃の各測定環境において、ｐＨ電極からの入力電位の代わりに−１０００ｍＶ〜＋１０００ｍＶの等価入力電位を入力し、ＣＰＵ回路を含む制御部を経て、表示部に表示された電位及びｐＨを調べた。 Regarding the pH meter (IM-55G, manufactured by Toa DKK Co., Ltd.), the relationship between the temperature of the measurement environment atmosphere, the input potential, and the displayed value of pH was determined, and the temperature drift of the pH meter was evaluated. That is, in each measurement environment where the ambient room temperature is 0 ° C., 23 ° C., and 40 ° C., an equivalent input potential of −1000 mV to +1000 mV is input instead of the input potential from the pH electrode, and a control unit including a CPU circuit is provided. Then, the potential and pH displayed on the display unit were examined.
その結果得られた電位の表示値を下記表１に、及びｐＨの表示値を下記表２にそれぞれ示した。尚、ｐＨ表示値は、得られた電位表示値（ｍＶ）から、制御部において５９.２ｍＶ／１ｐＨ（２５℃）により換算した値である。また、表中のｒｄｇ誤差とは、２３℃での値に対する０℃及び４０℃における誤差（表１では電位表示値の誤差、表２ではｐＨの誤差）を意味する。参考のために、表２のｐＨ表示値とｒｄｇ誤差との関係を、グラフにして図４に示した。 The display values of the electric potential obtained as a result are shown in Table 1 below, and the display values of pH are shown in Table 2 below. The pH display value is a value converted from the obtained potential display value (mV) by 59.2 mV / 1 pH (25 ° C.) in the control unit. The rdg error in the table means an error at 0 ° C. and 40 ° C. with respect to a value at 23 ° C. (in Table 1, an error in potential display value, and in Table 2, an error in pH). For reference, the relationship between the indicated pH value in Table 2 and the rdg error is shown as a graph in FIG.
上記表１〜２の結果及び図４から分かるように、２３℃での表示値に対し、電位表示値では最大で２ｍＶ程度、ｐＨ表示値では最大で０.０１〜０.０２ｐＨ程度の温度ドリフトが発生している。また、この温度ドリフトは、電位が０ｍＶからずれるほど、またｐＨが７.０００から離れるほど大きくなる。従って、このような温度ドリフトは、０.００１ｐＨクラスの高分解能表示が可能なｐＨ計では無視できないものである。 As can be seen from the results in Tables 1 and 2 above and FIG. 4, the temperature drift is about 2 mV at the maximum for the potential display value and about 0.01 to 0.02 pH at the maximum for the pH display value. Has occurred. The temperature drift increases as the potential deviates from 0 mV and the pH deviates from 7.000. Therefore, such a temperature drift cannot be ignored by a pH meter capable of high resolution display of 0.001 pH class.
上記の温度ドリフトを補正するプログラムを作成し、上記ｐＨ計の制御部のＣＰＵ回路に入力して記憶させた。その後、本体内回路が温度変化するように周囲の測定環境雰囲気の温度を変化させ、上記と同様に−１０００ｍＶ〜＋１０００ｍＶの等価入力電位を入力し、同時に測定した測定環境雰囲気の温度をＣＰＵ回路に供給して、表示部に温度ドリフト補正済の電位及びｐＨを表示させた。 A program for correcting the above temperature drift was created and input to the CPU circuit of the control unit of the pH meter and stored. Then, change the temperature of the surrounding measurement environment atmosphere so that the circuit in the main body changes, input an equivalent input potential of -1000 mV to +1000 mV as described above, and simultaneously measure the temperature of the measurement environment atmosphere measured in the CPU circuit. Then, the temperature drift corrected potential and pH were displayed on the display unit.
補正後の電位の表示値を下記表３に、及び補正後のｐＨの表示値を下記表４にそれぞれ示した。また、参考のために、表４のｐＨ表示値とｒｄｇ誤差との関係を、グラフにして図５に示した。これらの結果から分かるように、温度ドリフトは著しく抑えられ、０.００１ｐＨクラスの高分解能表示が可能なｐＨ計でも無視できる程度のものとなった。 The corrected potential display values are shown in Table 3 below, and the corrected pH display values are shown in Table 4 below. For reference, the relationship between the pH value shown in Table 4 and the rdg error is shown as a graph in FIG. As can be seen from these results, the temperature drift was remarkably suppressed, and even a pH meter capable of high-resolution display of 0.001 pH class was negligible.
１ 水質計本体
２ 入力操作部
３ 表示部
４ センサー部
５ 温湿度測定ユニット
６ 温度測定器
７ コネクタ
８ 本体内回路基板
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