| 摘要 |
A compact signal transmitter head infrared flame detector unit is mounted in a small opening in the wall of a fossil fuel fired furnace. The unit includes a preamplifier solid state circuit including an infrared sensor which is focused on the combustion zone of the furnace for sensing and transforming flame fluctuations into corresponding preamplified signal current fluctuations, which are conducted by a shielded cable to a transistorized main amplifier filter and rectifier circuit in a remote signal receiver terminal unit. The unit has the capability of distinguishing from the fluctuations inherent in the flame from the background radiation. An integrated control circuit is associated with the main amplifier circuit for digitally processing the signal fluctuations and automatically operating flame indicators and/or alarms as required by the condition of the flame combustion zone. |
