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Discovery Multisensor Detector

Product code: 58000-700APO

58000-700APO - Discovery Multisensor Detector
The Discovery Multisensor Detector consists of optical smoke and thermistor temperature sensors which give both a combined signal as well as a separate heat signal for improved false alarm management.
Full Details

Application Environments

Bedrooms

Hospitals

Hotels

Medium to large buildings

Offices

University campuses

Car parks/loading bays

Clean rooms

Warehouses

B&Bs/guest houses

Cafes

Care homes

HMOs

Restaurants

Small to medium buildings

Product Information

The Discovery Multisensor Detector consists of optical smoke and thermistor temperature sensors which give both a combined signal as well as a separate heat signal for improved false alarm management.

Brand Information

Discovery® is a range of high-specification, analogue addressable fire detectors and alarm devices. Discovery detectors offer effective false alarm management by a combination of EN 54 approved operating modes and sophisticated algorithms. Drift compensation further reduces the likelihood of false alarms caused by a build-up of dust in the sensing chamber. In addition to the familiar smoke and heat detectors, the Discovery range features two multisensor detectors. One is an optical/heat multisensor which can be used to protect against many types of fire risk. The other is a carbon monoxide/heat multisensor which protects against both smouldering fires and those generating heat.

Electrical Description

The Discovery Optical/ Heat Multisensor detector is designed to be connected to a two wire loop circuit carrying both data and a 17 V to 28 V dc supply. The detector is connected to the incoming and outgoing supply via terminals L1 and L2 in the mounting base. A remote LED indicator requiring not more than 4 mA at 5 V may be connected between the +R and -R terminals. An earth connection terminal is also provided.

Operation

The Discovery Multisensor construction is similar to that of the optical detector but uses a different lid and optical mouldings to accommodate the thermistor (heat sensor). The Discovery Optical/Heat Multisensor Detector contains an optical smoke sensor and a thermistor temperature sensor whose outputs are combined to give the final analogue value. The way in which the signals from the two sensors are combined depends on the response mode selected. The five modes provide response behaviour which incorporates pure heat detection, pure smoke detection and a combination of both. The multisensor is therefore useful over the widest range of applications. The signals from the optical smoke sensing element and the temperature sensor are independent, and represent the smoke level and the air temperature respectively in the vicinity of the detector. The detector’s micro-controller processes the two signals according to the mode selected. When the detector is operating as a multisensor (i.e. modes 1, 3 and 4) the temperature signal processing extracts only rate-of-rise information for combination with the optical signal. In these modes the detector will not respond to a slow temperature increase – even if the temperature reaches a high level. A large sudden change in temperature can, however, cause an alarm without the presence of smoke, if sustained for 20 seconds.

Device Addressing

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 heat sensitivity. This gives a high overall sensitivity to both smouldering and flaming fires. Mode 2 has a smoke sensitivity similar to that of a normal optical smoke detector. This mode is therefore equivalent to a standard optical detector. It is suitable for applications in which wide temperature changes occur under normal conditions. Mode 3 has moderate smoke sensitivity combined with a moderate sensitivity to heat. This combination is considered the optimum for most general applications since it offers good response to both smouldering and flaming fires. Mode 4 has lower than normal smoke sensitivity combined with high heat sensitivity. This makes it suitable for applications in which a certain amount of fumes or smoke is considered normal. Mode 5 has no smoke sensitivity at all, but gives a pure heat detector response meeting the response time requirements for a Class A1R detector in the European standard EN 54-5. In this mode the detector will respond to slowly changing temperatures and has a “fixed" temperature” alarm threshold at 58°C. The analogue value in this mode will give the approximate air temperature over the range 15°C to 55°C. In mode 5, the smoke sensor is still active though it does not contribute to the analogue signal. As a consequence, if the detector is used in a dirty or smoky environment the optical sensor drift flag may be activated in the heat-only mode. Notes 1. This applies only to fire control panels which have been programmed to read the additional information. 2. In situ testing of the Multisensor detector should be carried out as for smoke detectors in response mode 2 and for heat detectors in response mode 5. Both optical and heat sensors must be tested in modes 1,3 and 4. 3. If the Multisensor is to be used in mode 5, heat detector spacing/coverage should be applied.

Communication

Discovery, XP95 & CoreProtocol compatible

Maintenance & Service

Detectors should be maintained according to BS 5839-1 or other locally applicable code. Test equipment can be ordered from Apollo for testing smoke and heat detectors. Detectors should not be cleaned in the field except for careful removal of exterior dirt with a damp cloth. For cleaning and recalibration detectors should be returned to Apollo Fire Detectors or to the local distributor.

EMC Directive 2014/30/EU

The Discovery Heat Detector complies with the essential requirements of the EMC Directive 2014/30/EU, provided that it is used as described. A copy of the Declaration of Conformity is available from Apollo upon request. Conformity of the Discovery Heat detector with the EMC Directive, does not confer compliance with the directive on any apparatus or systems connected to them.

Construction products regulation 305/2011

The Discovery Heat Detector complies with the essential requirements of the Construction Products Regulation 305/2011/EU. A copy of the Declaration of Performance is available from Apollo upon request.

Additional Information

Discovery Optical/Heat Multisensor Detectors allow access to unprocessed temperature information . The raw temperature data can be used in conjunction with the analogue value to enhance alarm signal processing and provide an additional level of safety. The exact method of polling to make use of this feature is described in a technical document available to panel partners.

Key Features

Ideal for a wide range of applications Enhanced false alarm management Recommended, in specific modes, for hotel bedrooms and hospital wards Unaffected by wind or atmospheric pressure Well-suited to sensitive environments Five EN 54 approved response modes Heat only and optical only options Remote test feature

General
WirelessNo
Applications
  • Bedrooms
  • Hospitals
  • Hotels
  • Medium to large buildings
  • Offices
  • University campuses
  • Car parks/loading bays
  • Clean rooms
  • Warehouses
  • B&Bs/guest houses
  • Cafes
  • Care homes
  • HMOs
  • Restaurants
  • Small to medium buildings
Fire TypeFast and slow burning fires
Warranty10 year
Performance
Analogue value nominal0
Analogue value (- tolerance)4
Analogue value (+ tolerance)0
Analogue value23 +4/-0
Alarm level analogue value55
Chamber typeChevron
Heat classificationA1R
Electrical
Protocol voltage (min)5V
Protocol voltage (max)9V
Protocol voltage5 to 9V peak to peak
Power-up surge current 1mA
Maximum power-up time10 seconds
Status indicator - AlarmRed
Quiescent current470μA
Quiescent current tested at24V dc
Sampling frequency+L2 Loop in & out positive
Terminal functions L1 in+L1 in
Terminal functions L1 out+L1 out
PolarityL1 & L2 are polarity insensitive
Alarm current (at 24 volts)3.5mA
Environmental
Humidity (min)95% RH
Humidity (max)0% RH
Humidity Noteno condensation or icing
Humidity95% to 0% (no condensation or icing)
Operating temperature (min)-40°C
Operating temperature (max)70°C
Operating temperature-40 to 70°C
IP rating ValueIP44
Conformance
Standards
  • EN 54-5
  • EN 54-7
Approvals
  • FG
  • SBSC
  • BOSEC
  • LPCB
  • VdS
  • CPR
SIL rating2
Mechanical
Weight105g
ColourWhite
Materials housingPolycarbonate
Materials terminalsNickel plated stainless steel
Product height (wo/base)50mm
Product length50mm
Product diameter100mm
Detection principle
  • Photo-electric light scattering.
  • Temperature sensitive resistance.
Sensor configurationHorizontal optical bench housing infra-red emitter and sensor, arranged radially to detect forward scattered light.
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