| 摘要 |
PROBLEM TO BE SOLVED: To achieve miniaturization and cost reduction and to enable highly accurate measurement by applying pulse voltage across an indicating electrode and an opposed electrode. SOLUTION: One terminal of a pulse generator 18 is connected to an opposed electrode 12 and the other terminal thereof is connected to an indicating electrode 13 through a current/voltage converter 21 and the pulse generator 18 applies pulse voltage across the opposed electrode 12 and the indicating electrode 13 on the basis of the command from an operation means CPU 19. Since the voltage applied across both electrodes is pulsative, an electrolytic time is short and no effect is exerted on the thickness of a diffusion layer. An A/D converter 20 inputs the current signal from the indicating electrode 13 outputted through the current/voltage converter 21 to perform analogue/digital conversion. The output of the A/D converter 20 is processed by an operation means 19 to be subjcted to digital/analogue conversion by a D/A converter 22 to be sent to a display means 25 to perform the display related to the concn. of free effective chlorine. |
