| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fouling degree measurement test result of high precision. SOLUTION: The flame sensor 1 is equipped with a case 4 whose main body 2 is fitted with a main-body cover 3 with an opening, a circuit board 5 put in the case 4, a light reception window 7 which is provided to the case 4 to block the opening, a light receiving element 8 which is provided in the case 4 opposite the light reception window 7, a light emitting element 10 for fouling degree measurement which is provided opposite the light reception window 7, and a light receiving element 22 for fouling degree measurement which faces the light emitting element 10 across the light reception window 7, the light receiving element 22 for fouling degree measurement is arranged outside an element storage part 13. COPYRIGHT: (C)2005,JPO&NCIPI
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