A primary infra detector mounted on the ducts immediately starts the extinguisher in case of a spark. If no subsequent spark occurs within a short period of time, the event doesn’t trigger an alarm. The events are logged. The case of the detector contains a test transmitter as well, which checks functionality of the device. If length of the extracting system allows, a secondary detector and a fire damper can also be mounted.
INFRA-STOP 2000
Spark detector and extinguisher – fire compartmentation system
for extractor fans in timber industry
The system was developed in 1986. Since then, it has been installed in approx. 40 plants in Hungary. It has demonstrably prevented occurrence of fire or explosion on several occasions.
One the main sources of danger of extractor fans is that the material conveyed is flammable; and mixed with air, dust explosion might occur.
Protection of filter housings and containers is most efficiently provided when sources of ignition are detected in the extractor ducts and are quenched by extinguishing agent.
The closing unit of the fire damper is located outside the material stream when open. The trigger mechanism is a ratchet. After closing, it is set back manually. A terminal switch or a photocell informs the central unit about its condition. Operating voltage: 24V=; closing time 0.4 sec. The closing unit is covered with a non-combustible material of 6 mm. The damper is closed immediately by the secondary detector or when the event counter reaches the set values within a certain time. Then the extractors also stop; and acoustic and optical signals are sent.
Frost-free water power supply. The water power supply provides the nozzles with a water pressure of 7-9 bars, independently of the power supply. The pump is a GRUNDFOS CRx-xx type and is selected based on the size of the system. Other components: a pressure switch, a flow switch and manometers. In case of a failure, a magnetic valve closes the water outlet pipe.
