| 摘要 |
PURPOSE:To prevent to use a liquid metal having strong toxity and also, to eliminate the need for providing mechanical contact part in concentration measurement of residual chlorine in the liquid, by detecting an electric current generated by electromagnetic induction. CONSTITUTION:A liquid to be measured which has been introduced from an introducing opening 12a is filled in a liquid vessel 10 and next, a rotating electrode 3 and an originating amplifier 7 are rotated by rotating a driving motor 4. An induction electric current is generated by moving power generation coils 74, 74' in a magnetic field generating by direct current power supply parts 9, 9' and the current flows corresponding to the concentration of residual chlorine contained in the liquid to be measured in the vessel 10 by applying voltage to an indication electrode 1 and a comparison electrode 2. This current is detected and the chlorine concentration is displayed on a display part 83 through a luminous element 73 in the amplifier 7 and a photodetecting element 81 in a receiving amplifier 8. By said construction, it has not a mechanical contact part easy to bring about a bad contact and also, the concentration of the residual chlorine is measured accurately without using a highly poisonous liquid metal. |
