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Conductivity Meters – The Electrolytical ... - Fenno Medical Oy

Conductivity Meters – The Electrolytical ... - Fenno Medical Oy

Conductivity Meters – The Electrolytical ... - Fenno Medical

Conductivity MeasurementsC o n d u c t i v i t y M e t e r s The Electrolytical ConductivityConductivity is a para meter used to measure electrical properties of a solution. The more salt, acid or alkali in a solution,the greater its conductivity. The unit of conductivity is S/m, often also S/cm.The scale for aqueous solutions begins with pure water at aconductivity of 0.05 µS/cm (25 °C/77 °F). Naturally occurringwaters such as drinking water or sur face water have aconductivity in the range 100 1000 µS/cm. At the upperend of the chart some acids and bases can be found.Conductivity measurements are used for applications suchas in the production of ultrapure water or determining thesalinity of saltwater.Conductivity is measured by making a measurement of theelectrical resistance. The simplest kind of measuring cell usedconsists of two similar electrodes. An alternating voltageapplied to one of the electrodes causes the ions in thesolution to migrate towards the electrodes. The more ionsin the solution, the greater the current which flows betweenthe electrodes. The instrument measures the current anduses Ohm’s law to calculate first the conductance of thesolution and then by taking the cell data into account the conductivity.Conductivity of aqueous solutionsµS/cmmS/cm0,1 1 10 100 1 10 100 1000Feedwater for high-pressure boilersFully deionized water (ion exchanger)Deionized waterDrinking waterWastewaterBrackish water, saltwaterIndustrial process waterConcentrated acids and bases50For information visit www.WTW.com for a customer care center near you or inside US: call WTW 800 645 5999.

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