Patent ID: 6646443
Filing Date: 2003-11-11
Classification: G01N

Abstract:
An ion concentration meter characterized in that said ion concentration meter comprises a difference conductivity meter wherein two conductivity measuring cells each having at least two electrodes are arranged in series in a flow path of a sample to be measured so that a sample being sent makes contact with the cells in sequence, said difference conductivity meter producing a difference between signals themselves detected by the conductivity measuring cells as a difference in conductivity of the sample between the positions of the conductivity measuring cells, and said ion concentration meter deriving a change in ion concentration of the sample from the output from said difference conductivity meter, based on a predetermined correlation between a change in conductivity of the sample and a change in concentration of an ion to be detected in the sample, wherein a time delay column having a predetermined capacity is interposed between said two conductivity measuring cells arranged in said flow path of the sample to be measured.