| 摘要 |
PURPOSE:To simultaneously measure ion concentrations in a plurality of channels by using various of measuring electrode sections. CONSTITUTION:The ion concentration of a solution to be inspected is measured by dipping measuring electrode sections in the solution and measuring the potential differences between ion electrodes and reference electrodes respectively constituting the measuring electrode sections with differential amplifiers. The title meter is equipped with differential amplifiers 10-40 which are provided by the number corresponding to a plurality of channels and respectively provided with input terminals W1-W4 for connecting ion electrodes, input terminals R1-R for connecting reference electrodes, and input/output terminals O1-O4 for connecting earthing electrodes, first switching means Ry2, S2, S31, and S32 which connect/separate the reference electrodes to/from each other, second switching means Ry1, S11, S12, S13, and S14 which connect/separate the input terminals for connecting reference electrodes and the common earthing potential point of the differential amplifiers, and control circuits of each switching means. The first switching means are used by the reference electrodes in a shared state in a differential mode and the second switching means are used in a non- differential mode. |
