DE416207C - Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit - Google Patents

Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit

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Publication number
DE416207C
DE416207C DEN23324D DEN0023324D DE416207C DE 416207 C DE416207 C DE 416207C DE N23324 D DEN23324 D DE N23324D DE N0023324 D DEN0023324 D DE N0023324D DE 416207 C DE416207 C DE 416207C
Authority
DE
Germany
Prior art keywords
electrolyte
resistance
measuring
arrangement
bridge 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.)
Expired
Application number
DEN23324D
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German (de)
Inventor
Dr Karl Siebel
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.)
Neufeldt & Kuhnke Fa
Original Assignee
Neufeldt & Kuhnke Fa
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 Neufeldt & Kuhnke Fa filed Critical Neufeldt & Kuhnke Fa
Priority to DEN23324D priority Critical patent/DE416207C/en
Application granted granted Critical
Publication of DE416207C publication Critical patent/DE416207C/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Description

Anordnung zum messen eines Elektrolytwiderstandes unter Verwendung eines Elektrolytvergleichswiderstandes in Brückenschaltung. -Die Erfindung bezieht sich auf solche Anordnungen zum Messen eines. Elektrolytwiderstandes_, bei denen der zu messende Widerstand mit einem zweiten bekannten Elektrolytwiderstand verglichen wird.Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistor in a bridge circuit. -The invention relates refer to such arrangements for measuring a. Electrolyte resistance, where the resistance to be measured is compared with a second known electrolyte resistance will.

Gemäß der Erfindung wird als Stromquelle für eine derartige Meßanordnung Gleichstrom verwendet. Es hat sich nämlich herausgestellt, daß die dabei auftretenden Meßfehler weit unterhalb derjenigen Grenzen bleiben, die man bisher für die Gleichstrommessung von Elektrolyten für gegeben hielt. Die Erklärung dafür liegt wahrscheinlich in Folgendem: Der an einem Meßinstrument gemessene, scheinbare Widerstand eines Elektrolyten setzt sich aus folgenden drei Teilen zusammen: Erstens aus dem wirklichen Ohmschen Widerstand der gemessenen Flüssigkeitssäule, zweitens aus einem scheinbaren Widerstand, welcher von der Polarisationsspannung herrührt, und drittens aus einer Vergrößerung des Ohmschen Widerstandes durch die Bildung von Gasblasen an der Oberfläche der Elektrode. Wenn bei einer Messung des Widerstandes eines Elektrolyten der Widerstand z. B. nur aus Stromstärke und Spannungsabfall bestimmt wird, dann wird die Summe aller drei Teilwiderstände gemessen. Da das Verhältnis der zusätzlichen Widerstände zu dem Ohmschen Widerstand aber unter Umständen recht beträchtliche Werte annehmen kann, sind die Fehler einer solchen Messung naturgemäß recht bedeutend. Die Fehler gehen in dem Augenblick wesentlich zurück, wo mit Hilfe der Wheatstoneschen Brücke gemessen wird und als Vergleichswiderstand ein Elektrolytw-iderstand verwendet wird. In diesem Fall kann nämlich die Polarisationsspannung des . Vergleichselektrolyten fast genau auf der gleichen Höhe gehalten werden wie die des zu messenden Elektrolyten, so daß die eine Fehlerquelle praktisch ausscheidet. Da nun bei einer Messung nach der Nullmethode beide Widerstände von gleichstarken Strömen durchflossen werden, so kann bei gleichmäßiger Anordnung der Elektroden auch angenommen werden, daß die Bildung von Gasblasen ungefähr gleichmäßig verläuft. Dadurch wird auch die zweite Fehlerquelle auf ein Bruchteil ihrer sonstigen Größe zurückgeführt. Versuche haben gezeigt, daß sich die Ergebnisse der Gleichstrommessung fast genau mit denen der Wechselstrommessung decken.According to the invention, as a power source for such a measuring arrangement Direct current used. It has been found that the occurring Measurement errors remain far below those limits that have hitherto been used for direct current measurement of electrolytes taken for granted. The explanation for this probably lies in Following: The apparent resistance of an electrolyte measured on a measuring instrument consists of the following three parts: First, the real Ohm Resistance of the measured column of liquid, secondly from an apparent resistance, which arises from the polarization voltage, and thirdly from an enlargement the ohmic resistance due to the formation of gas bubbles on the surface of the Electrode. When when measuring the resistance of an electrolyte the resistance z. B. is only determined from current strength and voltage drop, then the sum of all three partial resistances measured. As the ratio of the additional resistances for the ohmic resistance, however, can assume quite considerable values under certain circumstances can, the errors of such a measurement are naturally quite significant. The mistakes go back substantially at the moment where with the help of the Wheatstone Bridge is measured and an electrolyte resistor is used as a comparison resistor. In this case, the polarization voltage of the. Comparative electrolyte be kept almost exactly at the same level as that of the electrolyte to be measured, so that one source of error is practically eliminated. Since now after a measurement the zero method both resistors are traversed by currents of equal strength, so it can also be assumed with a uniform arrangement of the electrodes that the Formation of gas bubbles proceeds roughly evenly. This will also make the second Source of error traced back to a fraction of its other size. Have attempts showed that the results of the direct current measurement are almost exactly the same as those of the Cover AC current measurement.

Zur Verbesserung der Meßresultate trägt wesentlich die Wahl einer höheren Gleichstromspannung bei. Dieser gegenüber ist nämlich die Polarisationsspannung so gering, daß Unterschiede in den Polarisationsspannungen der beiden Elektrolyten nicht mehr in das Gewicht fallen. Man wird also vorteilhaft eine Gleichstromspannung von 5o Volt und darüber wählen.To improve the measurement results, the choice of one is essential higher DC voltage. Opposite this is the polarization voltage so small that differences in the polarization voltages of the two electrolytes no longer fall into the weight. So one becomes advantageous one Select a direct current voltage of 5o volts and above.

Die Ergebnisse- der Messung mit Gleichstrom gemäß der Erfindung lassen sich zu derselben Genauigkeit wid die von Wechselstrommessungen bringen, wenn man die an sich immer noch vorhandene Fehlerquelle, nämlich die Bildung einer Gasschicht auf der Elektrode verhindert. Das geschieht gemäß der Erfindung dadurch, daß beide Elektrolyten bewegt werden, so daß die an den Elektroden vorbeistreichende Flüssigkeit die sich bildenden Gasbläschen mitnimmt und dadurch die Elektrodenfläche praktisch gasfrei hält.Leave the results - the measurement with direct current according to the invention will bring you to the same accuracy that of AC measurements if you the source of error that is still present, namely the formation of a gas layer prevented on the electrode. This is done according to the invention in that both Electrolytes are moved so that the liquid sweeps past the electrodes takes the gas bubbles that form with it, making the electrode surface practical keeps gas-free.

Die Anordnung gemäß der Erfindung ist besonders -geeignet für solche Stellen, an denen nur Gleichstrom zur Verfügung steht, z. B. zum Messen des Salzgehaltes für das Speisewasser von Dampfkesseln. Dabei ergibt sich auch gleich noch der Vorteil, daß man die zu messende Flüssigkeitssäule nicht besonders zu bewegen braucht, wenn man das Speisewasser durch ein Rohr führt, innerhalb dessen eine zu messende Flüssigkeitssäule durch zwei z. B. rohrförmige Elektroden abgegriffen wird.The arrangement according to the invention is particularly suitable for such Places where only direct current is available, e.g. B. to measure the salinity for the feed water of steam boilers. This also has the advantage of that you do not need to move the liquid column to be measured particularly if the feed water is passed through a pipe, inside which a column of liquid to be measured by two z. B. tubular electrodes is tapped.

Claims (3)

PATFNT-ANSPRÜCHE: i. Anordnung zum Messen eines Elektrolytwiderstandes unter Verwendung eines Elektrolytvergleichswiderstandes in Brükkenschaltung, dadurch gekennzeichnet, daß als Stromquelle Gleichstrom verwendet wird. PATFNT CLAIMS: i. Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistor in a bridge circuit, thereby characterized in that direct current is used as the power source. 2. Anordnung nach Anspruch i, dadurch gekennzeichnet, daß die Stromquelle mindestens 5o Volt Spannung hat. 2. Arrangement according to Claim i, characterized in that the current source is at least 50 volts Has. 3. Verfahren zum Betriebe einer Anordnung gemäß Anspruch i, dadurch gekennzeichnet, daß beide Elektrolyten ständig bewegt werden.3. A method for operating an arrangement according to claim i, characterized in that that both electrolytes are constantly moving.
DEN23324D 1923-11-17 1923-11-17 Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit Expired DE416207C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEN23324D DE416207C (en) 1923-11-17 1923-11-17 Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN23324D DE416207C (en) 1923-11-17 1923-11-17 Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit

Publications (1)

Publication Number Publication Date
DE416207C true DE416207C (en) 1925-07-18

Family

ID=7342548

Family Applications (1)

Application Number Title Priority Date Filing Date
DEN23324D Expired DE416207C (en) 1923-11-17 1923-11-17 Arrangement for measuring an electrolyte resistance using an electrolyte comparison resistance in a bridge circuit

Country Status (1)

Country Link
DE (1) DE416207C (en)

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