| 摘要 |
PURPOSE: To obtain an ion sensor not generating the error caused by ions to be measured by detecting the voltage of the soln. to be measured received in the hole of a plate member by ion responsive and ion non-responsive electrodes. CONSTITUTION: When a liquid to be measured is dripped in the bottomed hole forming the through-hole 21 of a case 20 to the upper surface of a sensor unit 40, the ion responsive electrode 41 and ion non-responsive electrode 42 on the upper surface of the unit 40 are immersed in the liquid to be measured. Ions to be measured are bonded to the ion selective film 412 of the electrode 41 and the voltage induced in the selective film 412 is detected by a metal sintered film 411. At this time, a substance adsorbing ions to be measured is not bonded to the electrode 41 and, therefore, the measuring error caused by the ions to be measured is not generated. The selective film 422 of the electrode 42 adsorbs no ions to be measured and the sintered film 412 detects the voltage by the ion to be measured and does not detect the voltage by the ion to be measured. The detection signals of the sintered films 411, 421 are amplified by field-effect transistors 43, 44 to be sent to a measuring electronic circuit. |
