| 摘要 |
<p>PURPOSE:To realize a small-sized and light-weight fire detection alarm by building an ultraviolet sensor, an alarm, and various electric circuits, etc., in one enclosure. CONSTITUTION:An ultraviolet sensor (UV tube) 1 which is operated when sensing ultraviolet rays included in a frame, a power source battery E, a DC-DC converter 2, a driving circuit 3 which outputs a pulse signal from the ultraviolet sensor 1, a flame discriminating circuit 4 which discriminates whether the pulse signal outputted from the ultraviolet sensor 1 is generated by sensing ultraviolet rays of the flame or sensing the other ultraviolet rays, an oscillating circuit 5 for alarm, and an alarm 6 are provided in one enclosure 7. The ultraviolet sensor 1 is exposed to the outside through an aperture window 8 of the enclosure 7. Thus, the configuration is simplified and the malfunction is prevented.</p> |
