File:Fse-beam-smoke-detector-v3.svg

Fse-beam-smoke-detector-v3.svg (SVG file, nominally 900 × 600 pixels, file size: 14 KB)

Summary

Optical density of evenly spread smoke at alarm against the obscuration setting, for three beam lengths. Based on Ministry of Business, Innovation and Employment (2025b), p. 28.

Original vector illustration for Beam smoke detector, level 2 Intermediate.

Source basis: Ministry of Business, Innovation and Employment (2025b), p. 28 (formula, typical range 20-70 %, example 10 m and 50 % = 0.030 m⁻¹)
Alt text: Line chart of optical density at alarm against obscuration setting for beams of 10 m, 50 m and 100 m; longer beams alarm at lower optical density.

Licensing

New drawing by Fire Safety Academy. © Fire Safety Academy.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	17:18, 2 November 2026		900 × 600 (14 KB)	Lisa (talk \| contribs)	Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity

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Beam smoke detector

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Short title	Optical density of evenly spread smoke at alarm against the obscuration setting, for three beam lengths. Based on Ministry of Business, Innovation and Employment (2025b), p. 28.
Image title	Line chart of optical density at alarm against obscuration setting for beams of 10 m, 50 m and 100 m; longer beams alarm at lower optical density. Source basis: Ministry of Business, Innovation and Employment (2025b), p. 28 (formula, typical range 20-70 %, example 10 m and 50 % = 0.030 m⁻¹)
Width	900
Height	600