| abstract |
(57) [Summary] [PROBLEMS] To separate and measure different components, particularly free residual chlorine, bound residual chlorine, dichloramine, etc. in a short time, Provided are a sensor of an oxidation-reduction current measurement device and an oxidation-reduction current measurement device, which can simplify a measurement operation and can minimize an installation place, an installation cost, and the like. SOLUTION: A sensor comprising a plurality of sensing electrodes (18) provided on a single sensing electrode support (16) and a common counter electrode (5) for these sensing electrodes is used. The redox current is measured. |