Experimental study on the testing environment improvement of fire smoke detectors

To simulate the test smoke for fire smoke detectors, the bypass setting of aerosol generator is currently adjusted to the particle size of 0.75 mu m according to the standard of EN 54-7 of China. It leads to the single test environment of fire smoke detectors. In this paper, the improvement of aerosol generator is presented. It makes the aerosol flow which has different particle size characteristics can be generated by aerosol generator and be installed several bypass flows according to the principle of aerosol generator. By the way, the particle size distribution and particle size characteristics of aerosol flow can be obtained after measuring the quality of aerosol flow which is collected under different bypass flows by Berner Impactor. So the different type of test smoke for fire smoke detectors can be obtained by aerosol generator. And then, the distribution characteristics of aerosol flow can be obtained in testing tubes (EN54-5/7c) of fire smoke detectors. Finally, the improved test environment of fire smoke detectors has realized the diversification of test environment. And the reliability of the test results has improved through this study. (C) 2012 The Authors. Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the Beijing Institute of Technology.