The Multi Gas Clip Simple Plus (MGC Simple Plus) is a portable gas detector that continuously measures O2, CO, H2S and LEL, with a long battery life and low-maintenance operation. Traditional LEL sensors work with a catalytic filament. This is heated to a temperature of several hundred degrees in order to ignite gas inside the sensor. Heating the catalytic filament consumes a fair amount of power. The LEL sensor in the MultiGasClip Simple works on the infrared principle. An infrared light source shines through the gas flow. Different types of gas refract infrared light in different ways. By measuring that refraction, the LEL sensor in the MultiGasClip determines whether flammable gases are present in the atmosphere.