Hochiki DRD-E User Manual download pdf (Page 4)

Page 4 of 12 DRD-E Flame Detector Installation Manual

2-3-0-1376/ISS1/NOV10

1 General

1.1 Description

The flame detector is designed for use where open flaming fires may be expected. It responds to the light

emitted from flames during combustion. The detector discriminates between flames and other light sources

by responding only to particular optical wavelengths and flame flicker frequencies. This enables the detector

to avoid false alarms due to such factors as flickering light sources.

1.2 Alarm Response Modes

The detector is normally configured to latch into an alarm state when a flame is detected. The supply to the

detector has to be removed in order to reset the detector.

1.3 IR Detection Basics

Flame detectors are classified into two types by their principle of detection. UV detectors are sensitive to

ultraviolet, and IR detectors are sensitive to infrared.

This DRD-E detector can detect IR radiated from flames. Flames radiated from a fire have an IR peak

emission of 4.3um occurring during the CO2 formation due to the combustion of hydrocarbons from 2 to 15

Hz.

Fig 1 : External View of DRD-E

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Hochiki DRD-E User Manual Page 4