| 摘要 |
PURPOSE:To obtain a detecting element of oxygen concn. which is inexpensive and mass produceable by punching fine holes inthe thick part of a pipe-shaped base body consisting of a solid electrolyte, inserting metallic wires therein and connecting the top ends thereof to noble metal electrodes. CONSTITUTION:Fine holes 9a, 9b are punched in the thick part of a pipe-shaped base body 7 consisting of a solid electrolyte and heat resistant metallic wires 10a, 10b are inserted therein. The wire 10a is connected at its top end 11a to an inside platinum electrode 12 and the wire 10b is connected at its top end 11b to an outside platinum electrode 13. The induced voltage corresponding to the difference between the oxygen concn. in the gas near a gas burner that contacts with the electrode 13 and the oxygen concn. in the air 15 from the outside that contacts with the electrode 12 is generated between the wires 14a and 14b. Since the provision of the electrodes 12, 13 at about 10mm. length on the side face of the body 7 suffices, the element is not so costly and the stage of applying platinum is easy. |
