fire alarm system >> control logic - italy >> Spark detection Systems

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Description

The spark detector is used for surveillance of the dust extraction ductwork connected to the silo and to neutralize every spark before it can ignite the silo. The spark detection system then comprises one or more detectors, an automatic extinguishing group and possibly a monitoring station. When a burning particle passes in front of the detector, the
built-in relay is operated for 3 sec, a sound alarm is turned on, the solenoid valve of the extinguishing group turns open and the nozzle sprays water for 3 sec, usually long enough to extinguish the burning particle. The monitoring station, if present, comprises other spark detectors located downstream from the extinguishing group, and triggers an alarm if a spark is not extinguished in order to stop the fan and/or shut off theduct valve.

The spark detector is mounted on the external surface of the duct, using the mounting frame, which consists of a metal shell in two pieces, carrying inside an anti-vibration rubber cushion. In the base to be fixed to the duct is a tempered glass window through which the spark detector will see inside the duct. The lid closes with four handle screws and allows quick opening for inspecting and testing.