Unfortunately, not all premises are equipped with fire detectors. Especially dangerous in this respect, workshops and warehouses, areas with hay or fuel and lubricants. Offer the design of fire alarm is simple device that does not require for the manufacture of scarce materials.
The sensor in it is in plastic tape or nylon fishing line. She stretched under the ceiling of the room; its ends held in a horizontal position two signal flag. In the event of hearth deck, tape or fishing line melts, freeing the signal flags, which, under the action of the counterweights be in a vertical position, and thus the arisen danger. Parallel to the visual alarms it is possible to arrange also the alarm system via the normal elektrosvarka or siren including contacts can be closed by turning the axis of the box is melted or breakage of the tape.
Fig. 1. Mechanical diagram of fire alarm of nylon fishing line.