JPH01242958A - Ion concentration measuring instrument - Google Patents

Ion concentration measuring instrument

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Publication number
JPH01242958A
JPH01242958A JP63071665A JP7166588A JPH01242958A JP H01242958 A JPH01242958 A JP H01242958A JP 63071665 A JP63071665 A JP 63071665A JP 7166588 A JP7166588 A JP 7166588A JP H01242958 A JPH01242958 A JP H01242958A
Authority
JP
Japan
Prior art keywords
electrode
circuit
signal
level
impedance
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.)
Pending
Application number
JP63071665A
Other languages
Japanese (ja)
Inventor
Takeshi Goto
剛 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP63071665A priority Critical patent/JPH01242958A/en
Publication of JPH01242958A publication Critical patent/JPH01242958A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To enable monitoring of a glass ion electrode at all times without removing the same from the instrument by impressing an AC signal between a reference electrode and the glass ion electrode and detecting the level fluctuation thereof. CONSTITUTION:The AC signal from an AC signal generating circuit 6 is impressed via a transformer 7 and a capacitor 8 to the input terminal of an inter- electrode potential difference detecting circuit 1 as well as to the glass ion electrode 2 and the reference electrode 3. The AC signal of the amplitude determined by the voltage dividing ratio of the input impedance of the circuit 1, the inter-terminal impedance of the electrodes 2, 3 and the output impedance of the circuit 6 is outputted from the circuit 1. This AC signal is amplified 10, rectified 11 and is compared with a reference level by a comparator circuit 13. The impedance of the electrode 2 decreases and the level of the AC signal impressed to the circuit 11 decreases eventually when the electrode 2 is cracked or the connector part is contaminated. The signal from the rectifier circuit 11, therefore, falls below the reference level and triggers an alarm 14, thereby announcing the level fall to an operator.

Description

【発明の詳細な説明】 (技術分野) 本発明は、ガラスイオン電極を使用したイオン濃度測定
装置、より詳しくはガラスイオン電極のクラックや電極
コネクタ部の!l!締不良不良出する技術に関する。
Detailed Description of the Invention (Technical Field) The present invention relates to an ion concentration measuring device using a glass ion electrode, and more specifically, to cracks in the glass ion electrode and cracks in the electrode connector portion. l! Regarding technology that causes poor tightening.

(従来技術) ガラスイオン電極を使用したイオン濃度測定装置は、ガ
ラスイオン電極自体の内部インピーダンスか50M乃至
1000Mオームと極めで高いため、電極間電位差を検
出する電極間電位差検出回路の入力インど−ダシスが高
く設定されている。
(Prior art) In an ion concentration measuring device using a glass ion electrode, the internal impedance of the glass ion electrode itself is extremely high, ranging from 50 MΩ to 1000 MΩ. Dasis is set high.

このため、ガラスイオン電極にクラックが生じたり、ガ
ラスイオン電極を接続するコネクタに汚染が生しると、
電極間電位差検出回路に印加されるガラスイオン電極の
電位が低下して測定結果に大きな誤差を生じるという問
題がある。
Therefore, if cracks occur in the glass ion electrode or contamination occurs in the connector that connects the glass ion electrode,
There is a problem in that the potential of the glass ion electrode applied to the interelectrode potential difference detection circuit decreases, causing a large error in the measurement results.

すなわち、例えば血液中の水素イオン濃度を測定する場
合にあっては、通常測定レンジは、PH7,35〜7.
45という極めて狭いものであるため、電極自体にクラ
・ンクが発生したり、コネクタ部に汚染があると測定結
果に大きく影Wを与えることになる。
That is, for example, when measuring the hydrogen ion concentration in blood, the normal measurement range is PH7.35-7.
45, so if a crack occurs in the electrode itself or if the connector part is contaminated, the measurement results will be greatly affected.

このため、従来は、ガラス電極や、これのコネクタ部を
定期的、に点検することが行なわれていたか、クラ・ン
クや結締不良は突発的発生する間係上、必ずしも十分な
方策とはいえながった。
For this reason, in the past, glass electrodes and their connectors were regularly inspected, but cranks and poor connections were only dealt with when they occurred suddenly, although this was not necessarily a sufficient measure. It was long.

(目的) 本発明はこのような問題に鑑みてなされたものであって
、その目的とするところは測定装置がらガラス電極を取
外すことなく雷時モニタすることができる新規なイオン
I7a度測定装置13供することにある。
(Purpose) The present invention was made in view of the above problems, and its purpose is to provide a novel ion I7a degree measuring device 13 that can monitor lightning conditions without removing the glass electrode from the measuring device. It is about providing.

(発明の概要) すなわち、本発明がvP徴とするところは、参照電極と
ガラスイオン電極との間に交番信号をを印加し、これの
レベル変動を検出するようにした点にある。
(Summary of the Invention) That is, the vP characteristic of the present invention lies in that an alternating signal is applied between the reference electrode and the glass ion electrode, and the level fluctuation thereof is detected.

(実施例) そこで以下に本発明の詳細を図示した実施例に基づいて
説明する。
(Example) The details of the present invention will be described below based on illustrated examples.

第1図は本発明の一実施例を示したものであって、図中
符号1は、ガラスイオン感応電極2と参照電極3との起
電力差を検出する電極間電位差検出回路で、これの出力
側には直流増幅器4を介して指示計5を接続してイオン
J度測定回路が構成されている。
FIG. 1 shows an embodiment of the present invention, and reference numeral 1 in the figure is an interelectrode potential difference detection circuit that detects the electromotive force difference between the glass ion-sensitive electrode 2 and the reference electrode 3. An indicator 5 is connected to the output side via a DC amplifier 4 to form an ion J degree measuring circuit.

6は、交番信号発生回路で、接続トランス7、及びコン
デンサ8を介して電極間電位差検出回路1の入力端子に
接続されている。
Reference numeral 6 denotes an alternating signal generation circuit, which is connected to an input terminal of the interelectrode potential difference detection circuit 1 via a connecting transformer 7 and a capacitor 8.

9は、電極間電位差検出回路1の出力側に接続された判
定回路で、交番増幅器10からの信号を直流に変換する
整流回路]]と、整流回路]]からの信号を基準レベル
電位設定器12と比較する比較回路13かうなり、整流
回路1]からの信号か基準レベルを下回った時点で信号
を出力してブザー等の警報器14を作動させるように構
成されている。
Reference numeral 9 denotes a determination circuit connected to the output side of the interelectrode potential difference detection circuit 1, which includes a rectifier circuit for converting the signal from the alternating box amplifier 10 into direct current, and a reference level potential setting device for converting the signal from the rectifier circuit into direct current. When the signal from the rectifying circuit 1 falls below a reference level, a signal is output and an alarm 14 such as a buzzer is activated.

この実施例において、ガラスイオン電極2と参照電極3
をサンプルに浸漬すると、サンプルのイオン濃度1こ比
例した電極電位がガラスイオン電極2から発生する。こ
の信号は、電極間電位差検出回路]により参照電極3の
基準電位との差分を検出されてイオン濃度として指示計
5に出力される。言うまでもなく、各電極2.3は、コ
ンデンサ8を介して交番信号発生回路6に接続されてい
るので、各電極2.31こ発生した電位は、コンデンサ
8によりトランス7に流れ込むことを逼@され、したが
ってレベル低下を起すことなく、各電極電位をそのまま
電極間電位差検出回路1に印加することができ、また各
電極2.3には交番電圧が作用するので電気化学的な影
響が相殺されるため、イオン濃度測定の動作に影Wt受
けることはない。
In this example, a glass ion electrode 2 and a reference electrode 3
When the glass ion electrode 2 is immersed in a sample, an electrode potential proportional to the ion concentration of the sample is generated from the glass ion electrode 2. The difference between this signal and the reference potential of the reference electrode 3 is detected by the interelectrode potential difference detection circuit and outputted to the indicator 5 as an ion concentration. Needless to say, since each electrode 2.3 is connected to the alternating signal generation circuit 6 via a capacitor 8, the potential generated by each electrode 2.31 is prevented from flowing into the transformer 7 by the capacitor 8. Therefore, each electrode potential can be directly applied to the interelectrode potential difference detection circuit 1 without causing a level drop, and since an alternating voltage is applied to each electrode 2.3, electrochemical effects are canceled out. Therefore, the operation of measuring ion concentration is not affected by Wt.

一方、交番信号発生回路6からの交番信号は、トランス
7、及びコンデンサ8を介して電極間電位差検出回路1
の入力端子、及びガラスイオン電極2と参照電極3に印
加され、電極間電位差検出回路1の入力インピーダンス
R]と画電極2.3の端子間インピーダンスR2との合
成インピーダンス日3と、交番信号発生回路6の出力イ
ンピーダンスR4との分圧比、つまり、 により定まる大きさ交番信号か電極間電位差検出回路1
から出力される。電極間電位差検出回路1から出た交番
信号は、交番増幅器1oにより増幅されたのち、整流回
路11により直流に変換され、比較回路13(こより基
準レベルと比較される。
On the other hand, the alternating signal from the alternating signal generating circuit 6 is transmitted to the interelectrode potential difference detecting circuit 1 via a transformer 7 and a capacitor 8.
and the input impedance R of the inter-electrode potential difference detection circuit 1 and the inter-terminal impedance R2 of the picture electrode 2.3, and the alternating signal generation. The voltage division ratio with the output impedance R4 of the circuit 6, that is, the magnitude determined by the alternating signal or the interelectrode potential difference detection circuit 1
is output from. The alternating signal output from the interelectrode potential difference detection circuit 1 is amplified by an alternating amplifier 1o, then converted to direct current by a rectifier circuit 11, and compared with a reference level by a comparison circuit 13.

ところで、ガラスイオン電極2やこれと測定回路を接続
しでいるコネクタが正常な場合には、ガラスイオン電極
2と参照電極3間のインピ−ダンスR1か極めで高い待
め、交番信号発生回路6からの交番信号は、B2/(日
2+84)の分圧lLにより電極間電位差検出回路]に
印加されるから、整流回路11から高レベル信号が出力
して基準レベルVsを越えることになり(第2図工)、
警報器14を不作動状態に維持する。
By the way, when the glass ion electrode 2 and the connector connecting it to the measurement circuit are normal, the impedance R1 between the glass ion electrode 2 and the reference electrode 3 is extremely high, and the alternating signal generation circuit 6 Since the alternating signal from B2/(day 2+84) is applied to the inter-electrode potential difference detection circuit by the partial pressure 1L, a high level signal is output from the rectifier circuit 11 and exceeds the reference level Vs. 2 drawings),
Keep alarm 14 inactive.

一方、ガラスイオン電極2にクラ・ンクか生しると、こ
のクラックからサンプル等が侵入してガラスイオン電極
2のインど−ダシスが低下し、結果とじで画電極2.3
間のインピーダンスも低下するから、交番信号発生回路
6からの信号は、9照電極−ガラスイオン電極間のイン
ピーダンスと電極間電位差検出回路の入力インピーダン
スの合成インピーダンスにより分圧され、結果として電
極間電位差検出回路1の入力端子に印加される交番信号
のレベルか低下する。このため、整流回路]1からの信
号が基準レベルVsを下回ることになって(第2図II
 ) 、 ’ff報器1ヰか作動してオペレータに点検
を促すことになる。
On the other hand, if cracks occur in the glass ion electrode 2, samples etc. enter through the cracks, reducing the inductance of the glass ion electrode 2.
Since the impedance between them also decreases, the signal from the alternating signal generation circuit 6 is divided by the composite impedance of the impedance between the electrode and the glass ion electrode and the input impedance of the interelectrode potential difference detection circuit, and as a result, the interelectrode potential difference The level of the alternating signal applied to the input terminal of the detection circuit 1 decreases. Therefore, the signal from the rectifier circuit] 1 falls below the reference level Vs (see Fig. 2 II).
), 'FF alarm 1 will be activated to prompt the operator to check.

ガラスイオン電極2のコネクタ部がサンプル等により汚
染して絶縁インピーダンスが低下すると、前述のクラッ
クの場合と同様に電極間電位差検出回路1の入力インピ
ーダンスか低下することになるから、やはり警報を発す
ることになる。
If the connector part of the glass ion electrode 2 is contaminated by a sample or the like and the insulation impedance decreases, the input impedance of the interelectrode potential difference detection circuit 1 will decrease as in the case of the crack described above, so an alarm should still be issued. become.

第3図は、本発明の第2寅施例を示すもので、図中符号
20は、判定回路で、直流カット用のコンデンサ15を
介して電極間電位差検出回路1の入力端子に接続された
整流回路]]と、基準レベル設定器]2からの信号を比
較する比較回路13から構成されている。
FIG. 3 shows a second embodiment of the present invention, and reference numeral 20 in the figure is a determination circuit connected to the input terminal of the interelectrode potential difference detection circuit 1 via a DC cut capacitor 15. A comparator circuit 13 that compares signals from a rectifier circuit] and a reference level setter 2.

この実施例にあいで、サンプルのイオン濃度に起因して
発生した信号は、コンデンサ8.15により閉止される
から、交番信号発生回路6、及び判定回路9に流れ込む
ようなことにはならす、イオン濃度が指示計に表示され
ることになる。
In this embodiment, the signal generated due to the ion concentration of the sample is blocked by the capacitor 8.15, so that the signal generated due to the ion concentration of the sample is prevented from flowing into the alternating signal generation circuit 6 and the determination circuit 9. The concentration will be displayed on the indicator.

一方、ガラスイオン電極2にクラツウか発生したり、コ
ネクタ部に汚染か発生すると、ガラスイオン電極2と参
照電極3との間のインピーダンスか低下するから、交番
信号発生回路からの信号は、分圧されることになって、
判定回路9に入力する交番信号のレベルか低下する。こ
れにより、基準レベルVs’を下回ることになって、警
報が発せられる。
On the other hand, if dirt occurs on the glass ion electrode 2 or contamination occurs on the connector part, the impedance between the glass ion electrode 2 and the reference electrode 3 decreases, so the signal from the alternating signal generation circuit is It was decided that
The level of the alternating signal input to the determination circuit 9 decreases. As a result, the voltage falls below the reference level Vs', and an alarm is issued.

なあ、上述の実施例においでは、交番信号を直流に変換
してレベルの判定を行なっているが、ピーク値を検出す
るようにしても同様の作用を奏することは明らかである
Incidentally, in the above embodiment, the level is determined by converting the alternating signal into direct current, but it is clear that the same effect can be achieved even if the peak value is detected.

(9jJ果) 以上、説明したように本発明によれば、参照電極とガラ
スイオン電極との間に交番信号を印加し、これのレベル
を検出するようにしたので、イオンJ度の測定動作に影
響を与えることなく、ガラスイオン電極自体の状態やコ
ネクタ部の絶縁抵抗を常時モニタして異常を迅速に発見
することができて、測定結果の信頼性を向上させること
ができる。
(9jJ result) As explained above, according to the present invention, an alternating signal is applied between the reference electrode and the glass ion electrode, and the level of this signal is detected. It is possible to constantly monitor the condition of the glass ion electrode itself and the insulation resistance of the connector part without affecting it, and to quickly discover abnormalities, thereby improving the reliability of measurement results.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す装置の構成図、第2図
は同上装置の動作を示す説明図、及び第3図は本発明の
他の実施例を示す構成図である。 1・・・・電極間電位差検出回路 2 ・・・・ガラスイオン電極
FIG. 1 is a block diagram of an apparatus showing one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the operation of the same apparatus, and FIG. 3 is a block diagram showing another embodiment of the present invention. 1...Interelectrode potential difference detection circuit 2...Glass ion electrode

Claims (1)

【特許請求の範囲】[Claims] 参照電極とガラスイオン電極からの信号を受ける電極間
電位差検出回路の入力端子側に、直流カット用コンデン
サを介して交番信号発生手段を接続するとともに、前記
電極間電位差検出回路に印加される交番信号レベルを検
出するようにしてなるイオン濃度測定装置。
An alternating signal generating means is connected to the input terminal side of an interelectrode potential difference detection circuit that receives signals from a reference electrode and a glass ion electrode via a DC cutting capacitor, and an alternating signal generating means is connected to the interelectrode potential difference detection circuit that receives signals from the reference electrode and the glass ion electrode. An ion concentration measuring device that detects levels.
JP63071665A 1988-03-24 1988-03-24 Ion concentration measuring instrument Pending JPH01242958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63071665A JPH01242958A (en) 1988-03-24 1988-03-24 Ion concentration measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63071665A JPH01242958A (en) 1988-03-24 1988-03-24 Ion concentration measuring instrument

Publications (1)

Publication Number Publication Date
JPH01242958A true JPH01242958A (en) 1989-09-27

Family

ID=13467124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63071665A Pending JPH01242958A (en) 1988-03-24 1988-03-24 Ion concentration measuring instrument

Country Status (1)

Country Link
JP (1) JPH01242958A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123818A (en) * 1996-10-29 2000-09-26 Zellweger Analytics Ltd. Gas detecting apparatus having condition monitoring means
JP2009092414A (en) * 2007-10-04 2009-04-30 Japan Organo Co Ltd Ion concentration measuring apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123818A (en) * 1996-10-29 2000-09-26 Zellweger Analytics Ltd. Gas detecting apparatus having condition monitoring means
US6251243B1 (en) * 1996-10-29 2001-06-26 Zellweger Analytics Ltd. Gas detecting apparatus having condition monitoring means
JP2009092414A (en) * 2007-10-04 2009-04-30 Japan Organo Co Ltd Ion concentration measuring apparatus

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