DISCOVERY ENGINEERING PRODUCT GUIDE Ionisation Smoke Detector Optical Smoke Detector Temperature Detector Multisensor Detector Manual Call Point
Discovery® is a range of high-specification, analogue addressable fire detectors developed and manufactured by Apollo Fire Detectors Limited. Designed to meet specifications for detectors incorporated in sophisticated systems, Discovery provides engineers with an additional dimension in fire protection capability. In view of some of the advanced features of Discovery, we recommend that engineers familiarise themselves thoroughly with the range by reading this product guide carefully.
DISCOVERY TABLE OF CONTENTS Communications 2 Discovery Features – Smoke and Heat Detectors Response setting User bytes and other stored data Conventional alarm facility Flashing LED Remote test feature Rejection of transient signals 3 3 4 4 4 4 Discovery Features – Smoke Detectors Drift compensation 5 Ionisation Smoke Detector Operating principles Technical data 6 7 Optical Smoke Detector Operating principles Technical data 8 9 Heat Detector Operating principles Technical data 10 11 Multisensor
COMMUNICATIONS Discovery uses a digital communications protocol which has been developed from the XP95 protocol but which differs in that it allows communication in three different modes: Normal, Read and Write. The reason for developing the protocol is that the Discovery range requires a more extensive exchange of information than previous analogue addressable ranges. In addition, Discovery can store data in non-volatile memory.
DISCOVERY FEATURES – SMOKE AND HEAT DETECTORS Response setting Each detector in the Discovery range can operate in one of five response modes, any of which can be selected from the control panel. Each mode corresponds to a unique response behaviour, which can be broadly related to sensitivity to fire. Whatever the type of detector, Mode 1 will give a higher sensitivity to fire than Mode 5. The selection of the most suitable mode depends on the application.
Conventional alarm facility Discovery devices should be polled at regular intervals to maintain communication with the control panel and therefore enable correct monitoring of the protected premises. However, if the polling mechanism fails, for example because of a processor failure in the panel, the internal operation of the Discovery device will be unaffected as long as a DC supply is maintained. After 108± 4 seconds without protocol, the device will automatically switch to its conventional alarm mode.
DISCOVERY FEATURES – SMOKE DETECTORS Drift compensation All Discovery smoke detectors include compensation for sensor drift as part of the internal signal-processing algorithm. The algorithm will compensate for changes in sensor output caused, for example, by dust in the chamber, and will therefore hold the sensitivity at a constant level even with severe chamber contamination. This increased stability is achieved without significantly affecting the detector’s sensitivity to fire.
DISCOVERY IONISATION SMOKE DETECTOR Mode Alarm threshold y value Minimum time to alarm (sec) 1 2 3 4 5 0.45 0.45 0.70 0.70 1.0 5 30 5 30 5 Compensation rate complies with EN54–7:2000 Table 1 Discovery Ionisation Smoke Detector page 6 OPERATING PRINCIPLES The Discovery ionisation smoke detector has a moulded white polycarbonate case with wind-resistant smoke inlets.
TECHNICAL DATA Discovery Ionisation Smoke Detector Part No 58000-500 Specifications are typical at 24V, 23°C and 50% relative humidity unless otherwise stated. Detection principle: Ionisation chamber Chamber configuration: Twin compensating chambers using one single sided ionising radiation source Terminal functions: L1 & L2 supply in and out connections +R remote indicator positive connection (internal 2.2kΩ resistance to positive) –R remote indicator negative connection (internal 2.
DISCOVERY OPTICAL SMOKE DETECTOR Discovery Optical Smoke Detector ▲ Part Number 58000-600 Mode Alarm threshold %/m 1 2 3 4 5 1.4 1.4 2.1 2.1 2.8 OPERATING PRINCIPLES The Discovery optical detector uses the same outer case as the ionisation smoke detector and is distinguished by the indicator LEDs which are clear when the detector is in quiescent state and red in alarm.
TECHNICAL DATA Discovery Optical Smoke Detector Part No: 58000-600 Specifications are typical at 24V, 23°C and 50% relative humidity unless otherwise stated.
DISCOVERY HEAT DETECTOR approximately linear characteristic from 10°C to 80°C. This linearised signal is further processed, depending on the response mode selected, and converted to an analogue output. Discovery Heat Detector page 10 may be given an “R” or “S” suffix. The “R” suffix indicates that the detector has been shown to have a rate-of-rise characteristic.
TECHNICAL DATA Operating voltage: 17–28V DC Discovery Heat Detector Part No: 58000-400 Communication protocol: Apollo Discovery 5–9V peak to peak Specifications are typical at 24V, 23°C and 50% relative humidity unless otherwise stated. Detection principle: Temperature sensitive resistance. Type code: 21043 765 11000 000 Supply wiring: Two-wire supply, polarity insensitive Terminal functions: L1 & L2 supply in and out connections +R remote indicator positive connection (internal 2.
DISCOVERY MULTISENSOR DETECTOR without the presence of smoke, if sustained for 20 seconds. The processing algorithms in modes 1 to 4 incorporate drift compensation. The characteristics of the five response modes are summarised below. Mode 1 has very high smoke sensitivity combined with high temperature sensitivity. This gives a high overall sensitivity to both smouldering and flaming fires.
TECHNICAL DATA Discovery Multisensor Detector, Part No 58000-700 Specifications are typical and apply at temperature 23°C and relative humidity 50% unless otherwise stated. Detector principle: Smoke: Photoelectric detection of light scattered by smoke particles Heat: Temperature-sensitive resistance Type code: Bits 2 1 0 4 3 7 6 5 10111 000 Supply wiring: Two-wire supply, polarity insensitive Terminal functions: L1 & L2 supply in and out connections +R remote indicator positive connection (internal 2.
DISCOVERY CARBON MONOXIDE DETECTOR levels of alcohol vapour as emitted by some cleaning agents there is a requirement to detect fires involving flammable liquids CO fire detectors are particularly suitable for supplementing smoke detection when there is: ■ a deep seated smouldering fire risk ■ a risk of fire starting in an enclosed space ■ a likelihood of stratification taking place Carbon monoxide detectors may be used as the primary fire detector in areas where the following conditions exist: ■ the main
LIMITATIONS CELL TEST Carbon monoxide detectors also have important limitations. They are set to a higher sensitivity than the maximum allowed by the domestic CO alarm standard and will respond to CO from faulty gas appliances or vehicle exhausts. These detectors should not be used in place of carbon monoxide alarms complying with BS7860 or UL2034. The Discovery carbon monoxide fire detector has a remote test feature, which is used to verify that the electro-chemical cell is fitted and that it is active.
TECHNICAL DATA Discovery Carbon Monoxide Fire Detector Communication protocol: Apollo Discovery 5–V peak to peak Specifications are typical and apply at 24V, 23˚C and 50% relative humidity unless otherwise stated.
DISCOVERY MOUNTING BASES Discovery/XP95 Mounting Base ▲ Part Number 45681-210 with XPERT card TECHNICAL DESCRIPTION All detectors in the Discovery range fit into XP95 mounting bases. Full details of bases and mounting accessories are given in PP1089 and PIN sheets PP2040 and 2043. An earth connection is not required for either safety or correct operation of detectors.
DISCOVERY MANUAL CALL POINT point has only one response mode. This is factory preset to 16. Discovery Manual Call Point (MCP) page 18 ▲ For Part Numbers see Table 5 OPERATING PRINCIPLES The Discovery call point is based on the KAC World Series. The address of each call point is set at the commissioning stage by means of a seven-segment DIL switch. If an MCP is activated it interrupts the normal protocol to give a fast response. For full details of the patented interrupt feature, see publication PP2027.
TECHNICAL DATA Manual Call Point Specifications are typical and apply at temperature 23°C and relative humidity 50% unless otherwise stated.
MECHANICAL CONSTRUCTION INTERCHANGEABILITY All detectors in the Discovery range have the same external dimensions, except the multisensor detector, which is deeper. The housing of the ionisation and optical smoke detectors is identical. Any Discovery detector may be replaced by any other type in the range.
DISCOVERY APPLICATION OF DISCOVERY DETECTORS The process of designing a fire detection system using Discovery detectors is the same as that used for any other detector range, except that Discovery offers more choices to the system designer. The principles set out in relevant codes of practice such as BS5839: Part 1 should be followed in any system design. The notes below are intended to supplement the codes of practice and to give some specific guidance on the choices available with the Discovery range.
conditions by selecting the correct mode (see Table 7). The relative performance of the four detector types for different fire types is given in Table 6. Choice of Response Mode A major objective in designing a detection system is to achieve the best detection performance while keeping the number of unwanted alarms at a low level. Unwanted alarms are normally caused by environmental influences. For any given environment, unwanted alarms will, as a rule, be more frequent for detectors of higher sensitivity.
Cleanroom EDP suite Mode 1 2 3 4 Hotel room; Office; Studio apartment; Long Corridor; small flat Hospital wards; (<50m2) Light industrial factory 5 1 2 3 4 5 1 2 3 4 5 Warehouse; Bar 1 2 3 4 S S Loading bay; Car park (enclosed & ventilated) 5 1 2 3 4 Kitchen; Laundry 5 1 2 3 4 Boiler room 5 1 2 3 4 5 MULTI OPTICAL ION S CO HEAT Recommended KEY Suitable S Table 7 Suitable as supplement Discovery Response Mode Selection Grid page 23
APOLLO FIRE DETECTORS LIMITED Apollo Fire Detectors Limited is part of the Halma plc group of companies and one of the world's leading manufacturers of conventional and analogue addressables smoke and heat detectors for commercial and industrial applications. Our products are sold in over 75 countries and we have won 3 Queen's Awards for Export Achievement.
PP2052/2001/Issue 3 Quality Systems Certificate No 010 Assessed to ISO 9001 36 Brookside Road, Havant, Hampshire PO9 1JR, England. Tel: +44 (0)23 9249 2412. Fax: +44 (0)23 9249 2754. Email: sales@apollo-fire.co.uk Website: www.apollo-fire.co.uk Apollo GmbH, Gneisenaustr IIA, 33330 Gütersloh, Germany. Tel: +49 5241 33060. Fax: +49 5241 330629 Air Products and Controls Inc., 1749 E Highwood, Pontiac, MI 48340, USA. Tel: +1 248 332 3900.
