| 摘要 |
PURPOSE:To make construction simple and manufacture easy and to make measurement with large output electric power by using electrodes consisting of different metals and detecting the electric current generated by bringing the two electrodes into contact with an aq. soln. to be measured in the form proportional to pH concn. CONSTITUTION:The electrode of the sensor is formed of the electrodes consisting of the different metals, for example, an Al electrode 1 and Zn electrode 2 and an insulator 3 for insulating both electrodes 1, 2. The current proportional to H<+> ion is generated together with a specified voltage in the circuit when the two electrodes 1, 2 are electrically coupled by bringing the liquid to be measured into contact with the electrodes 1, 2 to form a voltaic cell by the H<+> ion existing in the liquid. The output electric power in this case is read by a DC ammeter A and is measured. The electrode constitution is thus made simple and the manufacture is easy. The output electric power is increased and the measurement is made possible without using an amplifier circuit in some case. |
