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Beam detectors application guide system sensor europe

SYSTEM SENSOR EUROPE beam detectors application guide Advanced Ideas Advanced Solutions CCONTENTS FOREWORD GLOSSARY OF TERMS ANNUNCIATOR DRIFT COMPENSATION BEAM SMOKE DETECTOR PROJECTED BEAM SMOKE DETECTOR BEAM RANGE DETECTOR COVERAGE OBSCURATION RECEIVER SENSITIVITY POINT DETECTOR STRATIFICATION TRANSMITTER PROJECTOR PRINCIPLES OF OPERATION ACCESSORIES PROPER APPLICATION COMPARISONS BETWEEN BEAM DETECTORS AND POINT DETECTORS COVERAGE CEILING HEIGHT HIGH AIR VELOCITY STRATIFICATION HOSTILE ENVIRONMENTS DESIGN REQUIREMENTS SENSITIVITY LOCATION AND SPACING PITCHED ROOFS OBSTRUCTIONS SUPPLEMENTARY DETECTION BUILDING MOVEMENTS TESTING AND MAINTENANCE MAINTENANCE FUNCTIONAL TESTING AND S ADDRESSABLE BEAM DETECTOR RS AND R CONVENTIONAL BEAM DETECTOR REMOTE TEST SWITCH Note This document is based on the recommendations of BS Part It is intended only as a guide to the application of ?re detection systems Reference must be made to relevant national and local standards and manufacturer ? s recommendations CFOREWORD The purpose of this guide is to provide information on the proper utilization of beam smoke detectors in life-safety and property protection applications This guide brie y summarizes the principles of operation of projected beam smoke detectors their design requirements and practical applications for their use as a component of an automatic ?re alarm system Beam smoke detectors can be important components of a well-designed automatic ?re alarm system Their unique capabilities enable beam smoke detectors to overcome many of the problems and limitations of point detectors in some applications This guide was developed to help the ?re alarm system designer gain an understanding of the beam smoke detector ? s capabilities and limitations and how they di ?er from point detectors Please note that this document is intended only as a general guide to the application of beam detectors Reference should always be made to the detector manufacturer ? s installation requirements and instructions and to local standards for example in the UK BS part GLOSSARY OF TERMS ANNUNCIATOR DETECTOR COVERAGE A device which gives a visible or audible indication of the condition or status of a detector or module Usually Normal Standby Fault or Fire Alarm Detector coverage is the area in which a ?re detector is considered to e ?ectively sense an incipient ?re This area is de ?ned by local and national codes DRIFT COMPENSATION OBSCURATION Compensation made by a detector for signal degradation due to a build up of dust and dirt over time Rate of compensation is limited to ensure that the detector is still sensitive to slow smouldering ?res BEAM SMOKE DETECTOR PROJECTED BEAM SMOKE DETECTOR A ?re detector which uses a beam of light usually invisible projected across an area to monitor for smoke emitted by an incipient ?re There are two basic types of beam detector ? End to End Transmitter and receiver are mounted at either end of the protected area ? Re ective Transmitter and receiver are mounted in the same housing and the beam is directed at a specially designed re ector mounted at the opposite end of the protected area BEAM RANGE The beam range is the total distance between the beam transmitter