ATEX zones
Areas where an explosive dust atmosphere can occur are classified as zone 20, 21 or 22; for gas, zone 0, 1 or 2. The employer classifies the zones, and the machine’s marking must cover the zone it works in.
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Wiki · ATEX and combustible dust
Minimum ignition temperature.
The lowest surface temperature that can ignite a dust cloud or a dust layer, measured in °C. It decides which temperature class the machine needs, as shown in its ATEX marking.
In this entry
3 short parts.
Part1The valueTwo values for the same dust.↓ Part2The markingThe temperature in the ATEX marking.↓ Part3Related entriesMore on the same topic.↓1The value
Cloud and layer.
The minimum ignition temperature (MIT) is the lowest surface temperature that can ignite the dust.
It is measured in two ways: for the dust as a cloud, and for a 5 mm dust layer. You find the values in the safety data sheet or in test reports for your dust.
2The marking
Compare it with the machine’s temperature.
The ATEX marking states the highest surface temperature of the machine, for dust directly in °C.
This temperature must stay safely below the MIT values of your dust. The required margin is set in the standards; ask us if you are not sure.
Ask usNot sure what your task needs?
Send us what you know, and we take it from there.
The wiki gives general explanations. Always check the marking and the manual of your machine.
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