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The common laboratory conductivity meters employ a potentiometric method and four electrodes. ... An alternating current is applied to the outer pair of the electrodes. Conductivity could in principle be determined using the distance between the electrodes and their surface area.
A pH meter is used to determine the acidity or alkalinity of the solution. pH is the concentration of hydrogen ions in the solution. A solution containing more H+ ions remains acidic while the solution containing more OH- ions remains alkaline. pH value of solutions ranges from 1 to 14
Measurements are usually taken in water using a DO probe and meter
Dissolved Oxygen Measurement in Water with Oxygen Meters. DO in Water Basics.
The overall working principle of pH sensor and pH meter depends upon the exchange of ions from sample solution to the inner solution (pH 7 buffer) of glass electrode through the glass membrane. The porosity of the glass membrane decreases with the continuous use that decreases the performance of the probe.
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