| 摘要 |
PROBLEM TO BE SOLVED: To provide an infrared spot type flame detector free of a factor for an erroneous alarming, capable of minimizing an overlapped area of an alert range without an occurrence of a non-alert range even in case of installing a plurality of detectors by setting the alert range with a viewing angle adjusting plate to keep on the alert precisely aiming at an object. SOLUTION: This infrared spot type flame detector 1 is provided with a viewing angle adjusting plate 2 blocking an input to a light receiving part of the infrared spot type flame detector 1. A circular alert range 3 is set by a circular cutout shape of the viewing angle adjusting plate 2. COPYRIGHT: (C)2003,JPO
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