Studies Of Conductivity Measurement For Liquids

A new method of measuring conductivity for liquids based on cross-conductivity technique was presented. For this purpose, a unique design of conductivity cell with four electrodes and derivation the relationship of the cell constant with its capacitances and determine the cell constant to avoiding the difficulties for the determination of cell constant. This paper also briefly introduce the construction and the principle of current comparator used in the measurement system for measuring liquid resistances used for calculating conductivity. Constructing the measurement system to conduct measurements and to compare their results with those obtained by three electrodes technique. At last analyzing and calculate the uncertainty of each device and also Synthesis total uncertainty of measuring system .This technique can be applicable to many precision measurement of conductivity for a variety of liquids.