Dust Particles and Lower Explosive Limits (LEL) – Instruments

Dust particles have a minimum or lower explosive limit to almost no upper limit. Here are examples of minimum explosive limits (oz/ft3): Polystyrene (0.02) Cornstarch (0.04), Coal (0.055), Iron (0.12).

It is important to note an explosimeter gives a reading as a percentage. The reading is based on the percentage of the LEL and not the full concentration of the vapour or gas in the mixture. For example a 50% explosimeter reading of a gasoline/air mixture really translates into 0.7% gasoline (50% of 1.4%, the LEL). It is common practice to consider a 10% explosimeter reading or 10% of the LEL, as a safe working area. When taking explosimeter readings, consider the possibility that the vapour or gas may have accumulated in recessed areas (top or bottom of tank depending on the density of the gas or vapour).

explosability_of_dusts

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All information pertains to the South African context, but in many cases equivalent legislation is available in other countries. The information contained in this website is our interpretation of the acts and guidelines available.  While we may have ventured our opinion on certain issues, our opinion is based on our experience in the field of Fall-out Dust Monitoring.

We hope that the information contained in our website will give you some direction on issues related to fall-out dust monitoring.

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