EN 54-27:2015 pdf download.FIRE DETECTION AND FIRE ALARMS SYSTEMS – PART 27: DUCT SMOKE DETECTORS.
Introduction
Duct smoke detectors (DSD) are used as part of a fire detection and fire alarm system or as a stand-alone actuator for a fire protection system to sample the air within air ducts of a building. Detection of smoke can be used as a signal to the connected control and indicating equipment and can be used as a signal to an air- hand ling system to prevent the spread of smoke within the building.
A DSD is required to function satisfactorily not only in the event of a fire, but also in the conditions likely to be met in practice such as corrosion, vibration, direct impact, indirect shock and electromagnetic interference. Some tests specified are intended to assess the performance of the DSD under such conditions.
The performance of DSD is assessed from results obtained in specific tests. This document is not intended to place any other restrictions on the design and construction of such equipment.
An example for a stand-alone system is given in Figure K.1. The configuration of a fire detection and fire alarm system is given in EN 54-1.
Annex L gives information on power supply. These requirements are system requirements or requirements on other components respectively and do not concern the product requirements of the DSD.
EN 54-27 specifies requirements, test methods and performance criteria for fire detectors which detect smoke in air ducts in buildings as a part of a fire detection and fire alarm system or as an actuator for a fire protection system.
Duct smoke detectors with special characteristics and developed for specific risks are not covered by this document.
NOTE Certain types of detector contain radioactive materials. The national requirements for radiation protection differ from one member state to another and are not specified in this standard.
2 Normative references
EN 54-1 :2011, Fire detection and fire alarm systems – Part 1: Introduction
EN 547:2000,1) Fire detection and fire alarm systems – Part 7: Smoke detectors – Point detectors using scattered light, transmitted light or ionization
EN 54-13:2005, Fire detection and fire alarm systems – Part 13: Compatibility assessment of system components
3 Terms, abbreviated terms and definitions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 54-1 :2011, EN 54-13:2005 and the following apply.
3.1.1
duct smoke detector
fire detector that monitors the air in an air duct to detect smoke
Note 1 to entry: The combination with additional sensors for different fire phenomena is possible.
3.1.2
response threshold value
aerosol concentration within the duct in the proximity of the specimen at the moment that it generates an alarm signal
Note 1 to entry: The response threshold value can depend on signal processing in the detector and in the control and indicating equipment.
3.1.3
type I DSD
point smoke detector mounted inside the duct
3.1.4
type 2 DSD
point smoke detector mounted inside the duct with additional electrical components
Note I to entry: Additional electrical components, e.g. visual indicators are not coijered by EN 54 standards. Their functions are described e.g. in 4.2.1 4.2.2, and 4.2.3.
3.1.5
type 3 DSD
point smoke detector mounted outside the duct with additional mechanical means to sample the air
3.1.6
type 4 DSD
point smoke detector mounted outside the duct with additional mechanical means to sample the air and with additional electrical components
Note 1 to entry: Additional electrical components, e.g. visual indicators are not covered by EN 54 standards. Their functions are described e.g. in 4.2.1 4.2.2, and 4.2.3.
3.1.7
type 5 DSD
aspirating smoke detector with all sampling points inside the duct