Hochiki DRD-E User Manual

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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 queri es regarding these products or their functionality please contac t:  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.com

DRD-E 0832-CPD-1347 10 EN54-10 Flame detectors – point detectors

©2010 Hochiki Europe (UK ) Ltd. All rights reserved. No part of this document may be reproduced, stored in a retriev al system, or transmitted, in any form or by any means, without the prior permission in wri ting of Hochiki Europe ( UK ) Ltd.

Hochiki Europe ( UK ) Limit ed r eserves the right to alter the specifications of its products fr om time to time without notice. Although every effort has been made t o ensure the accur ac y of the information contained in this document it is not warranted or represented by Hochiki Europe (UK) Limited to be a com plete and up-todate description.

Document Detail s: Title: DRD-E Flame Detector - Installation Manual

Issue 1.0 Issue Date November 2010 Part No. 2-3-0-1376

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Table of Contents

1 General................................................................................................................................................ 4

1.1 Description.................................................................................................................................. 4

1.2 Alarm Response Modes..............................................................................................................4

1.3 IR Detection Basics..................................................................................................................... 4

2 Application.......................................................................................................................................... 6

2.1 Detecta b le Fire Sourc e s.............................................................................................................. 6

2.2 Typical Ap p l ica tions........................................................................................................... ..........6

2.3 Applications and Locat ions to Avoid:............................................................................................ 6

3 Quantities and Positioning................................................................................................................. 7

3.1 Field of View...............................................................................................................................8

3.2 Detector Window Contamination.................................................................................................. 9

3.2.1 Cleaning ................................................................................................................................. 9

4 Installation......................................................................................................................................... 10

4.1 Functional Testing..................................................................................................................... 11

4.2 Service & Repai r s...................................................................................................................... 11

5 Detector Specifications .................................................................................................................... 12

5.1 Compatible Bases..................................................................................................................... 12

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1 General

1.1 Description

The flame detector is designed for use where open flaming fir es may be expected. It responds to the light emitted fr om flam es during combustion. The detector discrim inates between flames and other light sources by responding only to particular optic al wav elengths and flame flicker frequencies. This enables the detector to avoid false alarm s due to such f ac tors as flickering light sources.

1.2 Alarm Response Modes

The detector i s normally configured to latch into an alarm state when a flame is detected. The supply t o the detector has to be rem ov ed in or der to reset the detector.

1.3 IR Detection Basics

Flame detect or s are classif ied into two types by their principle of detection. UV detector s are sensitive to ultraviolet, and IR detectors are sensitive to infrared.

This DRD-E detector c an detect IR radiated from flames. Fl am es radiated from a fire have an IR peak emission of 4.3um occurr ing during the CO2 formation due to the c om bust ion of hydrocarbons from 2 to 15 Hz.

Fig 1 : External View of DRD-E

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Fig 2 : Spectrum of white gas flame

The pyroelectr ic dev ic e fit ted within the DRD-E detector, can det ect CO2 f ormation during combusti on through an optic al filt er . The output is amplified from 2 to 15 Hz. The DRD-E detec tor will then make a fire decision using an AC- DC c onv er ter, comparator, and capacitor. It will then send an alarm signal to the fire panel via a switchi ng ci r c uit.

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2 Application

Flame detect or s are used when detection is required to be:

 Unaffected by convection currents, draught s or wind  Tolerant of fumes, v apour s, dust and m ist  Fast reacting

2.1 Detectable Fire Sources

 Liquids - Aviation Fuels (kerosene), Ethanol, Methylated Spiri ts, n-Heptane, Paraffi n, Petrol ( gasol ine)  Solids – Coal, Cott on, Grain & Feeds, Paper, Refuse Wood  Gases – Butane, Natural Gas, Off Gas, Propane

2.2 Typical Applications

 Coal handling pl ant  Aircraft hangars  Atria  Automotive industr y - spray booths, parts manufactur e  Paper manufacture  Pharmaceutical  Engine rooms  Generator rooms  Metal fabrication  Waste handling  Woodworking  Power plants  Textiles  Transformer stations  Petrochemical

2.3 Applications and Locations to Avoid:

 Ambient temper atures above 50°C  Dusty or steamy atmospheres  Atmospheres containing corrosive gases  Where condensation ex ists  In the vicinit y of lar ge IR sources – such as heater s, burners, fl ar es  Close proximity to RF sources  Obstructions to field of view  Exposure to weather  Large amounts of flickering reflections  Direct sunli ght or its reflected light by puddle, glass, or mirror surfac e of metal  Spot lighting di r ec tly on the detector optics

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3 Quantities and Positioning

The number of detect or s required and their position depends on:

 the anticipated size of the flame  the distance of the fl am e from the detector  the angle of vi ew of the flam e 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 det ec t an n-heptane (y ellow) fire of 0.1m² or methylated spirit (clear) fire of 0.25m² at a distance of up to 25m within 30 seconds.

In fact, the DRD-E flame detector will detect fires at distances of up to 40 metres, but the flam e size at such distances needs to be proportionally greater in order to be sure of reliable detection. Thus the yellow flickeri ng flame that can be detected at 25m, provided that its size is not less than 0.1m², will hav e to be

0.4m² in order to be detec ted at 40metres. In a rectangular r oom the distance from the flame detector to the fire is calculated by the formula:

Fig 3 : Calculation of d ista nc e from detect or to fla m e

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3.1 Field of View

The DRD-E flame detector has a field of view of approximat ely 90°, as shown in t he diagr am 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 perim eter of the room, pointing directly at the anticipat ed flame or at the centre of the area to be protected. If the detector cannot ‘see’ the whole of t he area to be protected, one or more additional detectors may be required.

The DRD-E flame detector is not affected by normal light sources but sho uld be positioned so that sunlight does not fall di r ectly onto the viewing window.

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3.2 Detector Window Contamination

It is important to keep the det ec tor window clean and checks should be carr ied out at regular interv als – determine loc ally according to the type and degree of contamination encountered – to ensure optimal perform anc e of the DRD-E flame detector. Although IR detector s can detect flames when the window is contaminat ed, there may be a reduction of sensitiv ity.

3.2.1 Cleaning

If the window of the DRD-E fl am e detector is coated with dust or oil, the sensitivity to flames may decrease. To remove the contami nation, use a damp cloth; please ensure to remove any excess moisture with a dry cloth.

NOTE: Do not wipe the main body of t he detector window with alcohol or benzine.

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4 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 ceili ng mounting bracket are availabl e if requir ed, these should be ordered separately . Please refer to Fig 7 and Fig 8 below.

Fig 6 : Installation with Mounting Base

Fig 7 : Installation with ceiling bracket (YZU-A) Fig 8 : Installation with wall bracket (YZU-B with YZU-A)

Fig 9 : Connection to Conventional Control Panel via CDX Mounting Bases

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4.1 Functional Testing

A portable flame detector test unit is available to generate simulated flame behav iour (Fig 10.). To test the detector, the test unit needs to be within 600mm of the DRD-E flame det ector . The DRD-E incorporates a 15 second delay to help filter out any transient IR sources that m ay occur . Between each test the DRD-E flame detector will need to be left for minute to allow for stabili sation.

If it is safe to do so, a naked flame c ould also be used to t est the DRD-E flame detector, please ensure that the flame is not exposed dir ec tly to the outer casing or lens as damage may oc c ur.

< 600mm

Fig 10 : Portable Flame Detector Test Unit

4.2 Service & Repairs

Servicing of t he fire pr otection system should be carried out by competent persons fami liar with this type of system, or as recomm ended by the local regulations in force.

Only the manuf actur er or equivalent authorised body may car r y out r epairs to the flame detectors. In practic al term s this means that flame detector may be repaired only at the manufacturer ’s fac tory.

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5 Detector Specifications

Ordering code DRD-E Operating voltage 15-30 Vdc (Nomi nal r ating 24Vdc) Standby current 70 uA at 24Vdc Delay time 15 to 21 Second Detection angle 90°Cone Infrared sensitivity range Class 1 – 0.1m2 n-heptane at 25m Maximum current in alarm state 40mA Remote indicat or drive(max) 20mA Operating tem per ature range -10°C to +50°C Maximum humidity 95%RH - Non condensing (at 40°C) Colour and case material White Ivory ABS Weight 125g

5.1 Compatible Bases

Order Code Function

YBN-R/6 Common Mounting Base. YBN-R/6SK Common Mounting Base c/w Schottky Diode. YBO-R/6RN Non- Latching Relay Base YBO-R/6RS Latching Rel ay Base c/ w Schot tky Diode. YBO-R/6PA F or use with compatible 2-Wir e systems. YBO-R/6R Latching Rel ay Base

NOTE: Alarm contr ol panel c om patibility is required f or certain base types.

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Hochiki DRD-E User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual