ISO/TS 19850:2022

TECHNICAL ISO/TS
SPECIFICATION 19850
First edition
2022-05
Fire tests — Use of LED (light-emitting
diode) as an alternative to white light
for measuring smoke parameters
Reference number
© ISO 2022
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and units. 1
5 Principle . 2
6 Overview of smoke measurement used in existing light extinction test methods .2
6.1 General . 2
6.2 Light-receiving system . 3
6.3 Measuring device . 3
6.4 Neutral density filter comparison . 3
7 LED light sources .3
8 Comparison of spectra from different light sources . 3
9 Method of measurement in each apparatus where the white light system is
originally installed .4
9.1 General . 4
9.2 Comparison between the original white light and the new LED in ISO 9705-1 . 5
9.2.1 General . 5
9.2.2 Method A . . . 6
9.2.3 Method B . . 7
9.3 Comparison between the original white light and the new LED in ISO 24473 . 7
9.4 Comparison between the original white light and the new LED in ISO 9239-1 . 7
9.4.1 General . 7
9.4.2 Method B . . 8
9.5 Comparison between the original white light source and the new LED source in
EN 13823 . . . 9
9.5.1 General . 9
9.5.2 Method A . . . 9
9.5.3 Method B . 10
9.6 Comparison between the original white light source and the new LED source in
IEC 61034-1 . 10
9.6.1 General . 10
9.6.2 Method B . . 11
10 Test fire sources .12
10.1 General .12
10.2 For standard tests in which a burner is used .12
10.3 For standard tests in which radiant heat is used .12
10.4 For standard tests in which liquid fuel is used .12
10.5 For the standard tests in which the fire source is not prescribed .13
11 Alternative method .13
11.1 General .13
11.2 Overview of apparatus .13
11.3 Smoke generator . 14
11.4 Flexible hose . 15
11.5 Exhaust fan . 15
11.6 Duct . . 15
11.7 Light source system .15
11.8 Test environment . 15
11.9 Test procedure for static system . 15
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12 Comparing the experimental results from the original white light and the
candidate LED .16
12.1 General . 16
12.2 Calculation method — transmission . 16
Annex A (informative) Example of measurements in the IEC 61034-1:2005 apparatus .17
Bibliography .19
iv
Foreword
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This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 1, Fire
initiation and growth.
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v
Introduction
Traditional white light bulbs including tungsten incandescent lamps, used until now for smoke density
measurements in fire tests, are no longer available. Methods therefore need to be developed for their
replacement with LED (light-emitting diode) light sources. This document is intended to provide
guidance on replacing the light source in a smoke density measurement with an LED light source.
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TECHNICAL SPECIFICATION ISO/TS 19850:2022(E)
Fire tests — Use of LED (light-emitting diode) as an
alternative to white light for measuring smoke parameters
1 Scope
This document specifies methodologies for comparing the smoke density and the smoke production
rate during fire tests measured by LED (light-emitting diode) with those measured by white light. These
methodologies are intended for the identification of suitable LEDs which can be used as alternatives to
white light sources.
2 Normative references
There are no normative re
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