| 摘要 |
The present invention provides a polarographic residual chlorine sensor capable of reducing the change over time of the electrode surface area of a working electrode. The polarographic residual chlorine sensor determiners the residual chlorine concentration by at least immersing the working electrode (2) and a counter electrode in the water to be measured, and measuring the current flow between the working electrode and a counter electrode caused by an oxidation-reduction reaction. The cross-sectional areas of a conductive material (16) constituting the working electrode perpendicular to the axial direction at different positions are the same shape, and are covered by a casing (17) in the manner of leaving axially two end faces, and an end face is immersed in the water to be measured. |
