User Manual - Hochiki Australia
Contents
1. 1 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 3 1 Field of View The DRD AS 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 Centre line of detector 0 4m flame seen at 40m 0 0 1m flame seen at 25m 30 7 30 45 _ 45 60 gt 60 75 15 90 i i i i 90 0 25m 40m Detector Fig 5 Detector Field of View Plot The DRD AS 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 If the detector cannot see the whole of the area to be protected one or more additional detectors may be required The DRD AS flame detector is not affected by normal light sources but should be positioned so that sunlight does not fall directly onto the viewing window Issued JUN 2011 Page 7 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 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 AS flame detector Although IR detectors can detect flames when the window is contaminated there may be a reduction of sensitivity 3 2 1 Cleanin2. d of view gt Exposure to weather gt Large amounts of flickering reflections gt Direct sunlight or its reflected light by puddle glass or mirror surface of metal gt Spot lighting directly on the detector optics Issued JUN 2011 Page 5 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 3 Quantities and Positioning The number of detectors required and their position depends on gt the anticipated size of the flame gt the distance of the flame from the detector gt the angle of view of the flame detector The DRD AS flame detector is designed to have a class 1 performance as defined in EN54 10 on the high sensitivity setting That is the ability to detect an n heptane yellow fire of 0 1m or methylated spirit clear fire of 0 25m at a distance of up to 25m within 30 seconds In fact the DRD AS flame detector will detect fires at distances of up to 40 metres but the flame size at such distances needs to be proportionally greater in order to be sure of reliable detection Thus the yellow flickering flame that can be detected at 25m provided that its size is not less than 0 1m will have to be 0 4m in order to be detected at 40metres In a rectangular room the distance from the flame detector to the fire is calculated by the formula Maximum distance VL W H Width Length Fig 3 Calculation of distance from detector to flame Issued JUN 2011 Page 6 of 1
3. etector the test unit needs to be within 600mm of the DRD AS flame detector The DRD AS incorporates a 15 second delay to help filter out any transient IR sources that may occur Between each test the DRD AS flame detector will need to be left for minute to allow for stabilisation If it is safe to do so a naked flame could also be used to test the DRD AS flame detector please ensure that the flame is not exposed directly to the outer casing or lens as damage may occur Fig 10 Portable Flame Detector Test Unit Model Name 016061 4 2 Service amp Repairs Servicing of the fire protection system should be carried out by competent persons familiar with this type of system or as recommended by the local regulations in force Only the manufacturer or equivalent authorised body may carry out repairs to the flame detectors In practical terms this means that flame detector may be repaired only at the manufacturer s factory Issued JUN 2011 Page 10 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 5 Detector Specifications Ordering code DRD AS Operating voltage 15 30 Vdc Nominal rating 24Vdc Standby current 70 uA at 24Vdc Delay time 15 to 21 Second Detection angle 90 Cone Infrared sensitivity range Class 1 0 1m n heptane at 25m Maximum current in alarm state 40mA Remote indicator drive max 20mA Operating temperature range 10 C to 50 C Maximum
4. g If the window of the DRD AS flame detector is coated with dust or oil the sensitivity to flames may decrease To remove the contamination use a damp cloth please ensure to remove any excess moisture with a dry cloth NOTE Do not wipe the main body of the detector window with alcohol or benzine Issued JUN 2011 Page 8 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 4 Installation The DRD AS flame detector can be used in conjunction with the following mounting bases YBN R 6 YBO R 6PA A wall and ceiling mounting bracket are available if required these should be ordered separately Please refer to Fig 7 and Fig 8 below Fig 6 Installation with Mounting Base paa Y YZU B YZU A Fig 8 Installation with wall bracket YZU B with YZU A NEXT DETECTOR OR END OF LINE CONTROL PANEL di YBN R 6 YBO R 6PA Cable Screen Fig 9 Connection to Conventional Control Panel Issued JUN 2011 Page 9 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 4 1 Functional Testing A portable flame detector test unit is available to generate simulated flame behaviour Fig 10 To test the d
5. hh HOCHIKI Model DRD AS Conventional Infrared Flame Detector User Manual Ver 1 0 Page 1 of 11 DRD AS Flame Detector User Manual Table of Contents 1 1 DESCANSAR A 3 1 2 Alarm Response ModS anean cnc cnn 3 1 3 IR Detection Basics aiii 3 27 AD PUI C AU ON eset di 5 2 1 Detectable Fire Sources c ccceccceeeeeceeeeceeeeeceaeeeeaaeseneecaeeecaaeseeaaesaneeceaeeeeaaeseeaaeseeeeseaeeseaeseeneeesaes 5 2 2 Typical AppliGations 2 22 caciih katt hia on het eae ia 5 2 3 Applications and Locations to AVOlO ococcccnnnnnicinonacoccnnnoncccnnnoncnnnnnnnn cnn nano naar 5 3 Quantities and PositiONINJ lt 0 ioniiaii seat ii enreda elena 6 3 1 ICI Of MW o a ii ei tds 7 3 2 Detector Window Contamination oooonnccninnccnncccnnonnnoncnnnanoconnnn nara rn 8 3 2 1 A A O O Te 8 4 Installation lidia 9 4 1 Functional Testing toria Lor E ARRASTRADOS 10 432 SOIVICO Repair 10 5 Detector Specifications coincidi 11 5 1 Compatible Bases ntsc ria ia iros 11 5 2 Angle Mount Bracket iste coa ta 11 5 3 A ada leas E E da ives Atenas eaviveenteeel A 11 Issued JUN 2011 Page 2 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual General 1 1 Description The flame detector is designed for use where open flaming fires may be expected lt responds to the light emitted from flames during combustion The detector discriminates between flames and other light sources by responding only to partic
6. humidity 95 RH Non condensing at 40 C Colour and case material White Ivory ABS Weight 1259 5 1 Compatible Bases Order Code Description YBN R 6 Common Mounting Base YBO R 6PA For use with compatible 2 Wire systems NOTE Alarm control panel compatibility is required for certain base types 5 2 Angle Mount Bracket Order Code Description YZU A Ceiling Bracket YZU B Wall Bracket To be used with Ceiling Bracket 5 3 Tester Order Code Description 016091 Portable Flame Detector Test Unit Issued JUN 201 1 Page 11 of 11 2011 Hochiki Corporation
7. ill 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 Issued JUN 2011 Page 4 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 2 Application Flame detectors are used when detection is required to be gt Unaffected by convection currents draughts or wind gt Tolerant of fumes vapours dust and mist gt Fast reacting 2 1 Detectable Fire Sources gt Liquids Aviation Fuels kerosene Ethanol Methylated Spirits n Heptane Paraffin Petrol gasoline gt Solids Coal Cotton Grain amp Feeds Paper Refuse Wood gt Gases Butane Natural Gas Off Gas Propane 2 2 Typical Applications Coal handling plant Aircraft hangars Atrium Automotive industry spray booths parts manufacture Paper manufacture Pharmaceutical Engine rooms gt Generator rooms gt Metal fabrication gt Waste handling gt Woodworking gt Power plants gt Textiles gt Transformer stations gt Petrochemical 2 3 Applications and Locations to Avoid gt Ambient temperatures above 50 C gt Location which tends to gather dust or oil film gt Atmospheres containing corrosive gases gt Where condensation exists gt In the vicinity of large IR sources such as heaters burners flares gt Close proximity to RF sources gt Obstructions to fiel
8. ular optical wavelengths and flame flicker frequencies This enables the detector to avoided false alarms due to such factors as flicking light sources 1 2 Alarm Response Modes The detector is normally configured to latch into an alarm state when a flame is detected The power 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 AS 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 HEAD BASE l Alarm indicator Red o y 2 7 ee e 1 o S hi l d LOW apphire glass Bg Y 37 3 45 3 Fig 1 External View of DRD AS Issued JUN 2011 Page 3 of 11 2011 Hochiki Corporation DRD AS Flame Detector Installation Manual 1 0 Resonance frequency of CO2 0 8 lt a 2 0 6 o o Cc 2 04 D 5 O 0 2 0 0 2 0 2 5 3 0 3 5 4 0 4 5 5 0 5 5 6 0 Wavelength u m Fig 2 Spectrum of white gas flame The pyroelectric device fitted within the DRD AS detector can detect CO2 formation during combustion through an optical filter The output is amplified from 2 to 15 Hz The DRD AS detector w
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