File:Fse-smoke-detector-v2.svg

Fse-smoke-detector-v2.svg (SVG file, nominally 900 × 600 pixels, file size: 5 KB)

Summary

Detector sensitivity varies with particle size. Based on Mulholland (2002), pp. 2-267–2-268.

Diagram for the article Smoke detector (Fire Safety Academy wiki, level 1 Basic).

Source basis: Mulholland (2002), pp. 2-267–2-268
Alt text: Ionisation sensitivity stronger below 0.3 µm and light-scattering sensitivity stronger above it.

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

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Short title	Ionisation sensitivity stronger below 0.3 µm and light-scattering sensitivity stronger above it.
Image title	Qualitative chart of relative detector sensitivity against particle size on a logarithmic axis. The ionisation curve (solid blue) falls with increasing particle size; the light-scattering curve (dashed orange) rises. They cross near 0.3 micrometres, the approximate comparison point in the cited source. Small flaming particles lie to the left, large smouldering droplets to the right. No numerical sensitivity values; the trend is source-specific and not a universal cutoff.
Width	900
Height	600