| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrochemical sensor measuring device dispensing with the judgment of a measuring electrode and a calibration electrode and capable of precisely measuring the concentration of a specified material in a sample electrolytic solution by judging various electrodes by a CPU without erroneous recognition. SOLUTION: In this device, the mode is transferred to a measurement mode after the installation of an electrochemical sensor 5 is judged by the CPU 16 from the input of a load detection signal from a sensor detecting circuit 15, a voltage is applied by a potential control circuit 12 so as to keep the working electrode 2 and reference electrode 4 of the electrochemical sensor 5 in a constant potential, and the current value depending on the concentration of the specified material in the sample electrolytic solution generated between the working electrode 2 and a counter electrode 3 is detected by a current detecting circuit 13. In the CPU 16, the current value shown by a digital signal from an A/D converter 14 is read and stored in a RAM 18, the concentration of the specified material is calculated and measured according to the relational expression between the current value preliminarily stored in a ROM 17 and the concentration of the specified material, and the result is displayed in an LCD 19. |
