| 摘要 |
PURPOSE:To display that a gas sensor is normally operated by a method wherein a display part for displaying a variation of an internal resistance of the gas sensor is provided. CONSTITUTION:An internal resistance for a gas sensor at a sensing part 1 becomes low as the concentration of reduction gas in air becomes high. As a variation value of the internal resistance of the gas sensor is applied as a stable point of the gas sensor, a display part 3 is changed over. When the display part is to be changed over, a threshold value is set at a certain specified level, both levels B and C are set at an air deterioration level, a red point is illuminated at the level C, for example, a red point is lit at the level B, an air cleaner is operated for a certain specified period of time within the level B and after it is stopped, a green point is lit. With this arrangement, a display condition is varied with respect to the air condition, thereby a user himself may get the air condition and a normal degree of operation in gas sensor can be inspected for a manufacture. |
