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[ pdf ] Conductivity Measurement

Conductivity Measurement Download
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Topic under  Conductivity Meters
Source: globalautomation.info 
File size: 190.57 KB
File type: pdf
Last download on: Sun Feb 18, 2018 01:49:05 PM
Short Desciption:
Electrolytic (Contacting) Conductivity Measurement. Introduction. All solutions containing water conduct electricity to some extent. ...

Summary:
All solutions containing water conduct electricity to some extent. The measure of the ability of a solution to conduct electricity is called “conductance” (the reciprocal of resistance). Addition of electrolytes such as salts, acids or bases to pure water will increase the ability of the liquid to conduct electricity. This increases the solution’s conductance (decreases the resistance). An electrolytic conductivity measuring system measures solution conductance by using an analyzer interconnected with cable to a sensor immersed in the solution. The conductivity sensor is composed of a temperature sensor and two electrodes in contact with the solution. The analyzer circuitry impresses an alternating voltage between the two electrodes and the magnitude of the resulting current is linearly related to the solution conductivity. When the temperature of a solution changes, its conductivity changes. Typically, a temperature change is compensated with a thermistor (temperature sensitive resistor) in the conductivity sensor to alter the gain of the measuring circuit. Regardless of the actual solution temperature, the display indicates what the solution conductivity would be if the solution temperature were 25°C (an internationally accepted reference). This temperature compensation may be achieved automatically or manually. All solutions do not have the same amount of conductivity change for a given temperature change. For example, the change for hydrochloric acid is 1.5% per °C, and the change for sodium chloride is 2.1% per °C. The ratio of solution conductivity change to temperature change is referred to as the temperature compensation slope and is expressed as % per °C.
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