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DRD-E Flame Detector Installation Manual Page 5 of 12
© 2010 Hochiki Europe (UK) Ltd
2-3-0-1376/ISS1/NOV10
Fig 2 : Spectrum of white gas flame
The pyroelectric device fitted within the DRD-E detector, can detect CO2 formation during combustion
through an optical filter. The output is amplified from 2 to 15 Hz. The DRD-E detector will then make a fire
decision using an AC-DC converter, comparator, and capacitor. It will then send an alarm signal to the fire
panel via a switching circuit.