JPH05215708A - Method for automatically calibrating ph meter - Google Patents
Method for automatically calibrating ph meterInfo
- Publication number
- JPH05215708A JPH05215708A JP4020341A JP2034192A JPH05215708A JP H05215708 A JPH05215708 A JP H05215708A JP 4020341 A JP4020341 A JP 4020341A JP 2034192 A JP2034192 A JP 2034192A JP H05215708 A JPH05215708 A JP H05215708A
- Authority
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- Japan
- Prior art keywords
- meter
- conductivity
- time
- standard solution
- calibrating
- 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.)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、pH計と導電率計が一
体となった導電率計一体型pH計を校正するpH計自動
校正方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pH meter automatic calibration method for calibrating a pH meter integrated with a conductivity meter in which a pH meter and a conductivity meter are integrated.
【0002】[0002]
【従来の技術】図3は、pH計とpH校正液タンクを結
ぶ流路に設けられた電磁バルブの動作と、pH計内の試
料水とpH標準液との流量の割合と、pH計のpH値の
変化とを表した関係図である。この図3において前記電
磁バルブが作動してpH標準液がpH計に到達するまで
の時間をAとし、pH計内の試料水がpH標準液と完全
に入れ代わる液置換時間をBとし、pH標準液が完全に
入れ代わってからpH計のpHが安定するまでの電極応
答時間をCとし、このA、B、Cの合計時間を予め測定
しておいてこの合計時間をタイマーに設定し、電磁バル
ブが開弁してからこの設定時間だけpH標準液をpH計
内に流してpH計の自動校正を行なっていた。2. Description of the Related Art FIG. 3 shows an operation of an electromagnetic valve provided in a flow path connecting a pH meter and a pH calibration solution tank, a flow rate ratio of sample water and a pH standard solution in the pH meter, and a pH meter of the pH meter. It is a relationship diagram showing change of pH value. In FIG. 3, the time required for the pH standard solution to reach the pH meter upon actuation of the electromagnetic valve is A, and the solution replacement time for completely replacing the sample water in the pH meter with the pH standard solution is B. Let C be the electrode response time from when the liquid is completely replaced until the pH of the pH meter stabilizes. The total time of A, B, and C is measured in advance, and this total time is set in the timer. The pH standard solution was allowed to flow into the pH meter for this set time after the valve was opened, and the pH meter was automatically calibrated.
【0003】しかし、流通型セルを用いたプロセス用p
H計の自動校正を行なう場合、試料水やpH標準液を流
す流路に温度変化などによって気泡ができて試料水やp
H標準液の流量が減少することがある。また、流路に汚
れなどが溜まってpH標準液の流量が減少することもあ
る。ところが、前記のようにタイマーを使用してpH標
準液の流量時間を一定に設定している場合にpH標準液
の流量の減少によってpH標準液の総量が少なくてpH
の校正が適正に行なわれない場合があった。However, p for process using a distribution type cell
When the H meter is automatically calibrated, air bubbles are generated in the flow path for flowing the sample water and the pH standard solution due to temperature changes, etc.
The flow rate of the H standard solution may decrease. In addition, the flow rate of the pH standard solution may decrease due to the accumulation of dirt in the channel. However, when the flow time of the pH standard solution is set to be constant using the timer as described above, the total amount of the pH standard solution is small due to the decrease in the flow rate of the pH standard solution.
There was a case that the calibration of was not done properly.
【0004】そこで、従来、pH標準液をpH計に流入
させる時間を予め長めに設定しておいてその設定時間が
経過するまでpH標準液を流し続けるという方法がとら
れていた。Therefore, conventionally, a method has been adopted in which the time for allowing the pH standard solution to flow into the pH meter is set long beforehand and the pH standard solution is kept flowing until the set time has elapsed.
【0005】その他の方法としてpH標準液を流す流路
に定量ポンプを取り付け、この定量ポンプによってpH
計内に流れるpH標準液の流量を一定に保ちpHの校正
が適正に行なわれるようにしていた。As another method, a metering pump is attached to the flow path of the pH standard solution, and the pH is adjusted by this metering pump.
The flow rate of the pH standard solution flowing in the meter was kept constant so that the pH was properly calibrated.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来のpH計の自動校正方法のうち、前者のように多めに
pH標準液をpH計に流す場合は、当然にpH標準液の
使用量が多くなりpH標準液の貯蔵量が増えて、大きな
スペースを必要とするとともに、ランニングコストが高
くなるという問題点があった。また、後者の定量ポンプ
を使用する場合もコスト高になるという問題点があっ
た。However, of the above-mentioned conventional automatic calibration methods for pH meters, when the pH standard solution is flowed to the pH meter in a large amount like the former, the amount of pH standard solution used is naturally large. Therefore, there is a problem that the storage amount of the pH standard solution increases, a large space is required, and the running cost increases. In addition, there is a problem that the cost becomes high when the latter metering pump is used.
【0007】本発明は、このような従来の問題点を解決
するためになされたもので、省スペースで、コストを下
げることのできるpH計自動校正方法を提供することを
目的としている。The present invention has been made in order to solve such a conventional problem, and an object thereof is to provide a pH meter automatic calibration method which is space-saving and can reduce the cost.
【0008】[0008]
【課題を解決するための手段】本発明のpH計自動校正
方法は、pH計と導電率計が一体となった導電率計一体
型pH計にpH標準液を流入させてpHを校正するpH
計自動校正方法において、pH計とpH校正液タンクを
結ぶ流路に設けられたバルブが開弁した時を基準時と
し、pH標準液が正常な状態の流路を流れ、前記基準時
からpH計のpHを安定させるまでのpH計基準安定時
間と、基準時から前記pH標準液によって導電率計の導
電率が変化するまでの導電率基準指示時間とを予め求
め、pH計を校正する際、基準時からpH標準液によっ
て導電率計の導電率が変化するまでの導電率指示時間を
求め、この導電率指示時間と導電率基準指示時間との比
を前記pH計基準安定時間に積算して基準時からpH計
のpHが安定するpH計安定時間を演算し、このpH計
安定時間だけpH標準液をpH計に流入させpH計のp
Hを校正する。The pH meter automatic calibration method of the present invention is a method for calibrating a pH by allowing a pH standard solution to flow into a pH meter integrated with a conductivity meter in which a pH meter and a conductivity meter are integrated.
In the automatic meter calibration method, when the valve provided in the flow path connecting the pH meter and the pH calibration solution tank is opened as the reference time, the pH standard solution flows through the flow path in a normal state, and the pH is adjusted from the reference time. When calibrating the pH meter, the pH meter standard stabilization time until the pH of the meter is stabilized and the conductivity standard instruction time from the standard time until the conductivity of the conductivity meter changes due to the pH standard solution are obtained in advance. , The conductivity indicating time from the reference time until the conductivity of the conductivity meter changes by the pH standard solution is obtained, and the ratio of the conductivity indicating time and the conductivity reference indicating time is added to the pH meter reference stabilization time. Calculate the pH meter stabilization time for the pH of the pH meter to stabilize from the reference time, and allow the pH standard solution to flow into the pH meter for this pH meter stabilization time,
Calibrate H.
【0009】[0009]
【作用】上記した構成により、pH計とpH校正液タン
クを結ぶ流路に設けられたバルブが開弁した時を基準時
とし、pH標準液が泡などの障害物の無い正常な流路を
流れ、前記基準時からpH計のpHを安定させるまでの
pH計基準安定時間と、基準時から前記pH標準液によ
って導電率計の導電率が変化するまでの導電率基準指示
時間とを予め求める。With the above structure, when the valve provided in the flow path connecting the pH meter and the pH calibration solution tank is opened as a reference time, the pH standard solution can be used as a normal flow path without obstacles such as bubbles. Flow, a pH meter reference stabilization time from the reference time until the pH of the pH meter is stabilized, and a conductivity reference instruction time from the reference time until the conductivity of the conductivity meter is changed by the pH standard solution are obtained in advance. ..
【0010】pH校正時においてpH標準液が泡などの
障害物のある流路を流れる場合はpH標準液の流量は減
少する。pH標準液の流量の減少によって基準時からp
H計のpHが安定するpH計安定時間と、基準時からp
H標準液によって導電率計の導電率が変化するまでの導
電率指示時間が伸びる。流路を流れるpH標準液の流量
が一定であれば前記pH計安定時間と導電率指示時間の
伸びは比例する。When the pH standard solution flows through the flow path having obstacles such as bubbles during pH calibration, the flow rate of the pH standard solution decreases. p from the standard time due to the decrease in the flow rate of the pH standard solution
PH meter stabilization time for the pH of the H meter to stabilize and p from the standard time
The H standard solution increases the conductivity indicating time until the conductivity of the conductivity meter changes. If the flow rate of the pH standard solution flowing through the flow path is constant, the stabilization time of the pH meter and the elongation of the conductivity indicating time are proportional.
【0011】そこで、以後、実際にpH計を校正する場
合に導電率指示時間を求め、予め求めておいたpH計基
準安定時間に導電率指示時間と導電率基準指示時間との
比を積算し、pH計安定時間を演算し、このpH計安定
時間に基づいてpH標準液をpH計に流入させることに
よって無駄なpH標準液の使用をなくし、pH標準液の
貯蔵量を少なくすることができる。また、定量ポンプな
どを使用することなく適正なpH計の校正ができる。Therefore, after that, when actually calibrating the pH meter, the conductivity instructing time is obtained, and the ratio of the conductivity instructing time and the conductivity reference instructing time is added to the pH meter reference stabilization time which is obtained in advance. By calculating the pH meter stabilization time and flowing the pH standard solution into the pH meter based on this pH meter stabilization time, it is possible to eliminate the use of the unnecessary pH standard solution and reduce the storage amount of the pH standard solution. .. Further, it is possible to properly calibrate the pH meter without using a metering pump or the like.
【0012】[0012]
【実施例】以下に本発明の一実施例を図1および図2に
基づいて説明する。図1は、本発明の一実施例のpH計
自動校正方法に用いられる導電率一体型pH計の要部回
路図である。この図1において、1はpH計であって、
上部にpH電極2を有し、下部に導電率計3を備え、下
部入口4から流入した試料水5が、電極6で導電率が測
定され、pH電極2でpHが測定された後、上部出口7
から流出するよう構成されている。8は、pH7の標準
液9が貯留されたpH標準液タンクであって、試料水5
が流れる流路10と配管及び電磁バルブ11を介して結
ばれている。電磁バルブ11は試料水5とpH標準液9
とを選択してpH計1内に流すためのバルブである。な
お、12はpH9の標準液が貯留されたpH標準液タン
ク、13はpH標準液12をpH計に流すための電磁バ
ルブ、14はpH電極内部液である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit diagram of a main part of a pH meter with an integrated conductivity, which is used in a pH meter automatic calibration method according to an embodiment of the present invention. In FIG. 1, 1 is a pH meter,
The pH electrode 2 is provided on the upper portion, the conductivity meter 3 is provided on the lower portion, the conductivity of the sample water 5 flowing from the lower inlet 4 is measured by the electrode 6, and the pH is measured by the pH electrode 2, Exit 7
Is configured to drain from. Reference numeral 8 denotes a pH standard solution tank in which a standard solution 9 having a pH of 7 is stored.
Is connected to a flow path 10 through which a flow of water flows and a solenoid valve 11. Electromagnetic valve 11 is sample water 5 and pH standard solution 9
This is a valve for selecting and flowing into the pH meter 1. Reference numeral 12 is a pH standard solution tank in which a standard solution of pH 9 is stored, 13 is an electromagnetic valve for flowing the pH standard solution 12 to a pH meter, and 14 is a pH electrode internal solution.
【0013】次に、本実施例のpH計自動校正方法を説
明する。図2は前記図3の関係図に記載したものの他
に、導電率計における試料水とpH標準液との流量の割
合、pH標準液導電率と試料水導電率の変化を表した関
係図である。Next, the pH meter automatic calibration method of this embodiment will be described. FIG. 2 is a relational diagram showing changes in the flow rate ratio of the sample water and the pH standard solution in the conductivity meter, and changes in the pH standard solution conductivity and the sample water conductivity, in addition to those shown in the relationship diagram of FIG. is there.
【0014】まず、pH計1とpH標準液タンク12を
結ぶ流路10に設けられた電磁バルブ11が開弁した時
を基準時と定める。そして、pH標準液9が泡などの障
害物の無い正常な流路を流れ、前記基準時からpH計1
のpHを安定させるまでのpH計基準安定時間を測定す
る。このpH計基準安定時間は、電磁バルブ11が作動
してpH標準液9がpH計1に到達するまでの時間A0
と、pH計1内の試料水5がpH標準液9と完全に入れ
代わる液置換時間B0 と、pH標準液9が完全に入れ代
わってからpH計1のpHが安定するまでの電極応答時
間C0 の合計時間である。次に、基準時からpH標準液
9によって導電率計3の導電率が最初に変化するまでの
導電率基準指示時間D0 を求める。前記pH計基準安定
時間(A0 +B0 +C0 )と導電率基準指示時間D0 を
演算装置(図示せず)に記憶させておく。First, the time when the electromagnetic valve 11 provided in the flow path 10 connecting the pH meter 1 and the pH standard solution tank 12 is opened is defined as the reference time. Then, the pH standard solution 9 flows through a normal flow path free of obstacles such as bubbles, and the pH meter 1 is operated from the reference time.
Measure the standard stabilization time of the pH meter until the pH is stabilized. The pH meter reference stabilization time is the time A 0 until the pH standard solution 9 reaches the pH meter 1 by the operation of the electromagnetic valve 11.
And the liquid replacement time B 0 at which the sample water 5 in the pH meter 1 completely replaces the pH standard solution 9 and the electrode response time from the complete replacement of the pH standard solution 9 until the pH of the pH meter 1 stabilizes. It is the total time of C 0 . Next, the conductivity reference instruction time D 0 from the reference time until the conductivity of the conductivity meter 3 first changes by the pH standard solution 9 is obtained. The pH meter reference stabilization time (A 0 + B 0 + C 0 ) and the conductivity reference instruction time D 0 are stored in a computing device (not shown).
【0015】次に、実際にpH計1を校正する際、基準
時からpH標準液9によって導電率計3の導電率が変化
するまでの導電率指示時間Dのみを求める。流路10内
の気泡等の影響でpH標準液9の流量が減少した場合
は、導電率指示時間Dが導電率基準指示時間D0 より伸
びる。導電率指示時間Dが伸びれば基準時からpH標準
液9がpH計1に到達するまでの時間Aと、pH計1内
の試料水5がpH標準液9と完全に入れ代わる液置換時
間Bと、pH標準液9が完全に入れ代わってからpH計
1のpHが安定するまでの電極応答時間Cの合計時間
(pH計安定時間)が比例して伸びるが、その関係は以
下に述べる数1のようになる。Next, when actually calibrating the pH meter 1, only the conductivity indicating time D from the reference time until the conductivity of the conductivity meter 3 is changed by the pH standard solution 9 is obtained. When the flow rate of the pH standard solution 9 is reduced due to the influence of bubbles in the flow path 10, the conductivity instruction time D becomes longer than the conductivity reference instruction time D 0 . If the conductivity indicating time D extends, a time A from the reference time until the pH standard solution 9 reaches the pH meter 1 and a liquid replacement time B at which the sample water 5 in the pH meter 1 completely replaces the pH standard solution 9 , The total time of the electrode response time C (pH meter stabilization time) from the complete replacement of the pH standard solution 9 to the stabilization of the pH of the pH meter 1 (pH meter stabilization time) increases proportionally. become that way.
【0016】[0016]
【数1】 [Equation 1]
【0017】そこで、導電率指示時間Dを測定し、以下
の数2のように導電率指示時間Dと導電率基準指示時間
D0 との比をpH計基準安定時間(A0 +B0 +C0 )
に積算すればpH計安定時間(A+B+C)が求められ
る。Therefore, the conductivity instructing time D is measured, and the ratio of the conductivity instructing time D and the conductivity reference instructing time D 0 is calculated by the following equation 2 to obtain a pH meter reference stabilization time (A 0 + B 0 + C 0). )
The pH meter stabilization time (A + B + C) can be calculated by adding
【0018】[0018]
【数2】 [Equation 2]
【0019】上記、pH計安定時間(A+B+C)を演
算装置内のタイマーに設定し、電磁バルブ11が開弁し
てからこの設定時間だけpH標準液9をpH計1内に流
せばpH計1の適正な自動校正を行なうことができる。If the pH meter stabilization time (A + B + C) is set in the timer in the arithmetic unit, and the pH standard solution 9 is flown into the pH meter 1 for this set time after the electromagnetic valve 11 is opened, the pH meter 1 The proper automatic calibration of can be performed.
【0020】[0020]
【発明の効果】以上のように本発明によれば、上記した
構成により、pH標準液の温度変化などによって流路内
に気泡が発生したり、流路内に汚れが溜まるなどの影響
でpH標準液の流量が変化してもその変化を検出してp
H標準液の使用量を必要最小限におさえることによって
pH標準液タンクを小さくして省スペース化とランニン
グコストを下げることができる。しかも、流量変化を検
出するための新たな装置や定量ポンプを必要とせず製造
コストを低下することができる。As described above, according to the present invention, due to the above-mentioned constitution, the pH is affected by the bubbles generated in the channel due to the temperature change of the pH standard solution or the accumulation of dirt in the channel. Even if the flow rate of the standard solution changes, the change is detected and p
By keeping the amount of H standard solution used to a minimum, it is possible to make the pH standard solution tank smaller and save space and lower running costs. Moreover, a new device for detecting a change in the flow rate or a metering pump is not required, and the manufacturing cost can be reduced.
【図1】本発明の一実施例のpH計自動校正方法に用い
られる導電率一体型pH計の要部回路図である。FIG. 1 is a circuit diagram of a main part of a conductivity-integrated pH meter used in a pH meter automatic calibration method according to an embodiment of the present invention.
【図2】本発明の電磁バルブの動作とpH計内のpH標
準液の状態を表した関係図である。FIG. 2 is a relational diagram showing the operation of the electromagnetic valve of the present invention and the state of the pH standard solution in the pH meter.
【図3】電磁バルブの動作とpH計内のpH標準液の状
態を表した関係図である。FIG. 3 is a relationship diagram showing the operation of the electromagnetic valve and the state of the pH standard solution in the pH meter.
1 pH計 2 pH電極 3 導電率計 5 試料水 8 pH標準液タンク 9 標準液 10 流路 11 電磁バルブ A+B+C pH計安定時間 D 導電率指示時間 1 pH meter 2 pH electrode 3 Conductivity meter 5 Sample water 8 pH standard solution tank 9 Standard solution 10 Flow path 11 Electromagnetic valve A + B + C pH meter stabilization time D Conductivity instruction time
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木下 喜代三 京都府京都市南区吉祥院新田二ノ段町68 京都電子工業株式会社内 (72)発明者 喜多 敏郎 京都府京都市南区吉祥院新田二ノ段町68 京都電子工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyozo Kinoshita 68 Kinoshoin Nittadancho, Kichijoin, Minami-ku, Kyoto City, Kyoto Prefecture Kyoto Electronics Industry Co., Ltd. 68 Ninodancho Kyoto Electronics Industry Co., Ltd.
Claims (1)
計一体型pH計にpH標準液を流入させてpHを校正す
るpH計自動校正方法において、pH計とpH校正液タ
ンクを結ぶ流路に設けられたバルブが開弁した時を基準
時とし、pH標準液が正常な状態の流路を流れ、前記基
準時からpH計のpHを安定させるまでのpH計基準安
定時間と、基準時から前記pH標準液によって導電率計
の導電率が変化するまでの導電率基準指示時間とを予め
求め、pH計を校正する際、基準時からpH標準液によ
って導電率計の導電率が変化するまでの導電率指示時間
を求め、この導電率指示時間と導電率基準指示時間との
比を前記pH計基準安定時間に積算して基準時からpH
計のpHが安定するpH計安定時間を演算し、このpH
計安定時間だけpH標準液をpH計に流入させpH計の
pHを校正することを特徴とするpH計自動校正方法。1. In a pH meter automatic calibration method for calibrating pH by flowing a pH standard solution into a pH meter integrated with a conductivity meter in which a pH meter and a conductivity meter are integrated, a pH meter and a pH calibration solution tank are provided. With the reference time when the valve provided in the connecting flow path is opened, the pH standard solution flows through the flow path in a normal state, and the pH meter reference stabilization time from the reference time until the pH of the pH meter is stabilized and , The conductivity reference instruction time from the reference time until the conductivity of the conductivity meter changes with the pH standard solution, and when calibrating the pH meter, the conductivity of the conductivity meter with the pH standard solution from the reference time The conductivity indicating time until the change occurs, the ratio between the conductivity indicating time and the conductivity reference indicating time is added to the pH meter reference stabilization time to calculate the pH from the reference time.
Calculate the pH meter stabilization time for the pH of the meter to stabilize
A method for automatically calibrating a pH meter, which comprises calibrating the pH of a pH meter by allowing a pH standard solution to flow into the pH meter for a stable time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4020341A JPH05215708A (en) | 1992-02-06 | 1992-02-06 | Method for automatically calibrating ph meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4020341A JPH05215708A (en) | 1992-02-06 | 1992-02-06 | Method for automatically calibrating ph meter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05215708A true JPH05215708A (en) | 1993-08-24 |
Family
ID=12024439
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4020341A Pending JPH05215708A (en) | 1992-02-06 | 1992-02-06 | Method for automatically calibrating ph meter |
Country Status (1)
Country | Link |
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JP (1) | JPH05215708A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016188819A (en) * | 2015-03-30 | 2016-11-04 | 国立大学法人高知大学 | Chemical sensor calibration device |
JP2017187373A (en) * | 2016-04-05 | 2017-10-12 | 東芝メディカルシステムズ株式会社 | Automatic analyzer |
WO2022074814A1 (en) * | 2020-10-09 | 2022-04-14 | 三菱重工業株式会社 | Analysis system and management system, and analysis method and analysis program |
-
1992
- 1992-02-06 JP JP4020341A patent/JPH05215708A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016188819A (en) * | 2015-03-30 | 2016-11-04 | 国立大学法人高知大学 | Chemical sensor calibration device |
JP2017187373A (en) * | 2016-04-05 | 2017-10-12 | 東芝メディカルシステムズ株式会社 | Automatic analyzer |
WO2022074814A1 (en) * | 2020-10-09 | 2022-04-14 | 三菱重工業株式会社 | Analysis system and management system, and analysis method and analysis program |
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