DRD-E Conventional Infrared Flame Detector Installation Manual
Page 2 of 12 DRD-E Flame Detector Installation Manual This manual details the installation of: DRD-E Flame Detector If you have any queries regarding these products or their functionality please contact: Hochiki Europe (UK) Limited Grosvenor Road Gillingham Business Park Gillingham Kent ME8 0SA Tel: +44 (0) 1634 260133 Fax: +44 (0) 1634 260132 Web: http://www.hochikieurope.com Email: psupport@hochikieurope.
DRD-E Flame Detector Installation Manual Page 3 of 12 Table of Contents 1 2 3 4 5 General ................................................................................................................................................ 4 1.1 Description.................................................................................................................................. 4 1.2 Alarm Response Modes ................................................................................................
Page 4 of 12 1 DRD-E Flame Detector Installation Manual 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.
DRD-E Flame Detector Installation Manual Page 5 of 12 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.
Page 6 of 12 2 DRD-E Flame Detector Installation Manual Application Flame detectors are used when detection is required to be: Unaffected by convection currents, draughts or wind Tolerant of fumes, vapours, dust and mist Fast reacting 2.1 Detectable Fire Sources Liquids - Aviation Fuels (kerosene), Ethanol, Methylated Spirits, n-Heptane, Paraffin, Petrol (gasoline) Solids – Coal, Cotton, Grain & Feeds, Paper, Refuse Wood Gases – Butane, Natural Gas, Off Gas, Propane 2.
DRD-E Flame Detector Installation Manual 3 Page 7 of 12 Quantities and Positioning The number of detectors required and their position depends on: the anticipated size of the flame the distance of the flame from the detector the angle of view of the flame detector The DRD-E flame detector is designed to have a class 1 performance as defined in BS EN54-10 on the high sensitivity setting. That is the ability to detect an n-heptane (yellow) fire of 0.1m² or methylated spirit (clear) fire of 0.
Page 8 of 12 DRD-E Flame Detector Installation Manual 3.1 Field of View The DRD-E flame detector has a field of view of approximately 90°, as shown in the diagram below. Fig 4 : Conical field of view of the flame detector Fig 5 : Detector Field of View Plot The DRD-E flame detector should be positioned at the perimeter of the room, pointing directly at the anticipated flame or at the centre of the area to be protected.
DRD-E Flame Detector Installation Manual Page 9 of 12 3.2 Detector Window Contamination It is important to keep the detector window clean and checks should be carried out at regular intervals – determine locally according to the type and degree of contamination encountered – to ensure optimal performance of the DRD-E flame detector. Although IR detectors can detect flames when the window is contaminated, there may be a reduction of sensitivity. 3.2.
Page 10 of 12 4 DRD-E Flame Detector Installation Manual Installation The DRD-E flame detector can be used in conjunction with the following mounting bases: YBN-R/6, YBOR/6R, YBO-R/6RN, YBO-R/6PA, YBN-R/6SK, and YBN-R/6RS. A wall and ceiling mounting bracket are available if required, these should be ordered separately. Please refer to Fig 7 and Fig 8 below.
DRD-E Flame Detector Installation Manual Page 11 of 12 4.1 Functional Testing A portable flame detector test unit is available to generate simulated flame behaviour (Fig 10.). To test the detector, the test unit needs to be within 600mm of the DRD-E flame detector. The DRD-E incorporates a 15 second delay to help filter out any transient IR sources that may occur. Between each test the DRD-E flame detector will need to be left for minute to allow for stabilisation.
Page 12 of 12 5 DRD-E Flame Detector Installation Manual Detector Specifications Ordering code Operating voltage Standby current Delay time Detection angle Infrared sensitivity range Maximum current in alarm state Remote indicator drive(max) Operating temperature range Maximum humidity Colour and case material Weight DRD-E 15-30 Vdc (Nominal rating 24Vdc) 70 uA at 24Vdc 15 to 21 Second 90°Cone 2 Class 1 – 0.
