| 摘要 |
The method involves connecting a light exit window (AF) and a light entry window of a cover plate (AP) with a light conducting unit (LL) such that light from a light source of one of two sensor units (SE1, SE2) of a fire alarm (BM) is received with a photo receiver of another sensor unit of the alarm. The light conducting unit is coated with a light reflecting material, and the cover plate is made up of plastic, metal and/or wood. The alarm is fixed on a cover of a constructionally limited space. An independent claim is also included for a fire alarm for differentiating fire from a manipulation of the fire alarm. |
