| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalytic combustion type gas sensor which is compact and can obtain stable sensor outputs over a long term. SOLUTION: In this catalytic combustion type gas sensor for calibrating combustible gases by detecting by a detection element 1a and a comparison element 1b a combustion heat generated, when the gas is burnt, sensor pins 2a and 2b spaced by a constant distance are set erecting to a base 3. The detection element 1a is fixed to the sensor pin 2a and the comparison element 1b is fixed to the sensor pin 2b. A heat-shielding plate 5 is arranged substantially at a middle position between the detection element 1a and the comparison element 1b. A sensor cap 4 is provided for covering the heat-shielding plate 5, the base 3 and the sensor pins 2a and 2b. The distance between each of the elements 1a and 1b and the heat-shielding plate 5 is set to be not smaller than 3 mm, the distance between each of the elements 1a and 1b and the sensor cap 4 is set to be not smaller than 4 mm, and a distance between each of the elements 1a and 1b and a wire mesh 6 for protecting explosion is set to be not smaller than 4 mm.
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