What does LEL mean? (Gas detection) The Lower Explosive Limit (LEL) is the lowest concentration of a gas or vapour in air that can ignite and lead to an explosion. For most flammable gases the LEL is usually below 5% by volume. This means that even a small amount of gas mixed with air can...

What is the difference between filtered and non filtered LEL sensors? Catalytic bead LEL sensors are widely used in portable gas detection because they offer reliable monitoring of combustible gases. Not all applications require the same level of protection which is why different sensor designs are used. BW and RAE Systems Technologies by Honeywell portable...

Introduction to Confined space entry A confined space, as defined by the Health and Safety Executive (HSE), is any area that is fully or partially enclosed and presents a reasonably foreseeable risk to workers due to hazardous conditions within the space. These risks can include fire or explosion from flammable substances, loss of consciousness caused...

Introduction to Photoionisation Photoionisation detection (PID) works by exposing a gas sample to high-energy ultraviolet (UV) light. Through a process called photoionisation, this light breaks down many volatile compounds, including most VOCs, into charged particles known as ions. These ions are drawn by an electric field towards electrodes, where they generate a small electrical current...