首页>
外国专利>
Flame monitor for burner with reversibly movable screen - closes safety valve when UV radiation ceases to excite photocell during variable periods of window opening
Flame monitor for burner with reversibly movable screen - closes safety valve when UV radiation ceases to excite photocell during variable periods of window opening
展开▼
机译:带有可逆移动屏幕的燃烧器火焰监控器-在可变的开窗期间,当紫外线停止激发光电池时,关闭安全阀
展开▼
页面导航
摘要
著录项
相似文献
摘要
Ultraviolet radiation from the flame is monitored by a photocell (3) on to whose cathode (3a) the radiation is conc. by a lens (5) through an axial bore (4) and window (8a). The opaque screen (18) interposed between the window (8a) and the photocell (4) is moved into and out of the optical path at intervals of about 1 second by a reversible stepping motor (16). The periodicity can be varied to suit the qualities of flame in various burners. USE/ADVANTAGE - Esp. on gas-fired boilers. Failures arising from weakening of restoring spring conventionally fitted to sliding screen are avoided.
展开▼