PURPOSE:To detect abnormal burning by disposing a detection circuit that detects imperfect burning condition by output signal from a photoreceptor element that catches the radiation light from a red-hot body. CONSTITUTION:Vaporized fuel is mixed with air in a hollow space between an outer flame tube 2 and an inner flame tube 3, and rises at it is burnt. As a red- hot body 6 which is disposed at the upper end of the outer tube 1 and is made with a rod in a Z-shape that consists of heat-resistant metal emits radiation light at a higher intensity than the burning flame 5 around it, the photoreceptor element 4 receives the light mainly from the red-hot body 6. When oxygen becomes defficient under such a condition, the flame intensity of burning wanes by the burning mechanism which is intrincic to the natural vaporization type burning apparatus, the calorific value to heat the red-hot body 6 deminishes. As a result, the radiation light from the red-hot body 6 decreases as the temperature of the red-hot body 6 decreases, and the spectrometric characteristics of light deviates to the side of a longer wave length. Therefore, by catching such a change by the photoreceptor element 4, an abnormal burning due to the oxygen defficiency can easily be detected even in a natural vaporization type burning apparatus.
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