| 摘要 |
PURPOSE:To prevent the heat applied from a heat insulating heater from escaping through an insulator by constituting the part in contact with the oxygen sensor of an insulator material having specific heat conductivity. CONSTITUTION:An insulator 50 supporting an oxygen sensor element 20 is formed of an upper insulator 51 and a lower insulator 52. The upper insulator 51 forms a slit for fitting to the element 20, and forms through-holes for insertion of lead wires 28, 29, 31. At least the part of the insulator 50 in contact with the element 20 is constituted of an insulator material of <=0.01cal.cm/cm<2>.sec. deg.C heat conductivity. |
