| 摘要 |
PURPOSE:To maintain the mixed solution concentration at specified value, by disposing the insulated container internally housing a standard electrode being filled with diluting water and a measuring electrode in a mixture tank, and controlling the raw liquid supply volume by the difference signal of the difference in themeasured values of both electrodes and the set value. CONSTITUTION:In a mixture tank 1 having a diluting water supply line 3, raw liquid supply line 2, and mixed solution supply line 4 are disposed an insulated case 14 internally housing a standard electrode 13 being filled with diluting water and a measuring electrode 12, and the outputs of both electric powers are inputted into a control panel 19 to find the difference of the two, which is further compared with the set point. If a difference is found, it is outputted from the control panel 19 to control the raw liquid supply volume through a driving motor 15 and raw liquid supply means 7, so that the mixed solution in the tank 1 is maintained at a specified concentration. In this apparatus, since the standard electrode 13 is maintained in the mixture tank (by way of the insulated case 14), the effect due to temperature difference in the mixture tank may be eliminated. Besides, since the apparatus is dipped in the dilution solution being used, the effect due to water quality of diluting water may be eliminated. Thus, the desired concentration of the mixed solution may be accurately maintained. |
