Patent ID: 6690172
Filing Date: 2004-02-10
Classification: G01N

Abstract:
A multiple electric conductivity apparatus comprising at least two electric conductivity measuring cells each having at least two electrodes brought into contact with a substance to be measured, said electric conductivity measuring cells being so connected electrically that sensing signals themselves from said electric conductivity measuring cells are treated to be added and/or subtracted, said at least two electrodes of each of said at least two electric conductivity measuring cells being constructed so that their electrode surfaces are formed by titanium oxide layers on surfaces of electrode bodies made of a conductive material, wherein each electric conductivity measuring cell has a space for storing a substance to be measured which is defined between respective electrode surfaces of said at least two electrodes, and light irradiating means for irradiating light onto the respective electrode surfaces, and wherein said light irradiating means comprises a light guiding material which guides light from a light source.