ISO 3182:2022 pdf download Light measuring system for smoke emission testing
Scope
This document specifies a measuring system that enables the determination of the transmittance andthe optical density of smoke emission tests under laboratory conditions. This document also providesthe calibration method for the system.
This document is an English-language version of DIN 50055, with minor editorial modifications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies
ISO 13943, Fire safety – Vocabulary
3 Terms and definitions
For the purposes ofthis document, the terms and definitions given in ISO 13943 and the following applyISO and IEC maintain terminology databases for use in standardization at the following addresses:
ISO Online browsing platform: available at https://wwwiso.org/obp
IEC Electropedia: available at https://wwwelectropediaorg/
3.1
smoke emission test
test for determining smoke emission levels of substances subject to thermal decomposition
Note 1 to entry: This test requires a decomposition system, a measuring room or duct, and a light measuringsystem.
3.2
light-measuring systemsystem for the measurement of light, implemented using a device that measures the attenuation oflightcaused by smoke and comprising a light source, light receiver, power supply and voltage or currentmeasuring device
3.3
transmittance
quotient oftransmitted radiant flux, P, and incident radiant flux, Pm
Note 1 to entry: Transmittance is calculated using Formula (1)l:
4.4 Power supply
The lamp shall be supplied with stabilized direct current, stable within +0,5 % (including temperatureshort-term and long-term stability).
4.5Voltage or current-measuring device
The voltage or current-measuring device contains a gain adjustment such that the initial measurementblank measurement) corresponds to a transmittance value of 100 % (or 1), and the measurement ofthe smoke will show the transmittance value, or the device can provide a voltage output for externalcapture of measured values, allowing calculation of the transmittance, The expanded uncertainty(k = 2) of the transmittance must not exceed 1,5 %.
To help simplify the evaluation of measuring results, the voltage or current measuring device can alsoprovide an output for external capture of the optical density.

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