ISO INTERNATIONAL STANDARD 14934-2 Second edition 2013-03-15 Fire tests Calibration and use of heat flux meters Part 2: Primary calibration methods Essais au feu - Etalonnage et utilisation des appareils de mesure du flux thermique - Partie 2: Méthodes d'étalonnage primaire Reference number IS0 14934-2:2013(E) ISO @IS0 2013 IS0 14934-2:2013(E) COPYRIGHTPROTECTEDDOCUMENT @IS02013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means,electronic or mechanical,including photocopying,or posting on the internet or an intranet, withoutprior written permission.Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel.+4122 7490111 Fax +412274909 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland i @ IS0 2013 -All rights reserved IS0 14934-2:2013(E) Contents Page Foreword ..V Introduction .vi 1 Scope. .1 2 Normative references. 3 Terms and definitions. 1 Principles. 4.1 General principles. 1 4.2 Principle of the vacuum black-body cavity (VBBC) method (method 1) 1 4.3 Principle of the spherical black-body cavity method (method 2) .2 4.4 Principle of the variable temperature black-body (VTBB) method (method 3) .2 5 Suitability of a gauge for calibration .2 5.1 Types of heat flux meters .2 5.2 Design of heat flux meters. 3 5.3 Measuring range. .3 5.4 Statusofheatfluxmeterpriortocalibration 3 6 Vacuum black-body cavity (VBBC) method (method 1) .3 6.1 Apparatus .3 6.2 Operating procedure. 6 6.3 Uncertainty .6 7 Spherical black-body cavity method (method 2) .7 7.1 Apparatus 7.2 Operating procedure. 11 7.3 Uncertainty 11 Variable-temperature black-body (VTBB) method (method 3) 14 8 8.1 Apparatus 14 8.2 Operating procedure. 16 8.3 Uncertainty 18 9 Number of calibration levels. .19 10 Expression of results .20 11 Calibration report. .21 Annex A (normative) Operating procedure for vacuum black-body cavity method (VBBC) (method 1) 22 Annex B (normative) Calculating the irradiance from the vacuum black-body cavity (VBBC) to the heat flux meter .24 Annex C (informative) Examples of computer screens for calculating the irradiance from the vacuum black-body cavity (VBBC). Annex D (normative) Operating procedure for spherical black-body cavity method (method 2)...29 Annex E (normative) Calculating the irradiance from the spherical black-body cavity to the heat flux meter. 31 Annex F (normative) Drawings for the fixed and movable cooler to the spherical black- body cavity .34 Annex G (informative) Guidance notes for operators using the spherical black-body cavity method .38 Annex H (normative) Electrical substitution radiometer (ESR) operating procedure .39 Annex I (normative) Procedure for heat flux meter calibration using the 25-mm VTBB method @ IS0 2013 - All rights reserved ii