Flameproof Fixed Gas Detectors are used in Potentially Explosive Atmospheres where, due to the nature of the environment or the industrial process taking place, there is the risk of an incendive spark from electrical apparatus causing an explosion to occur and the organisation responsible for the safety of the area requires that electrical equipment be enclosed within a flameproof enclosure (also known as an FLP, Ex d or explosion-proof enclosure). Examples are the oil, gas and chemicals industries. They can be supplied either in cast aluminium (standard type) or grade 316 stainless steel (suffix ‘-SS’). The detectors are fitted with a single sensor that can be an Infrared Sensor, for the detection of Hydrocarbon gases or Carbon Dioxide, a ‘Pellistor’ Catalytic Sensor for detection of both Hydrocarbon gases and Hydrogen or an Electrochemical Sensor for the detection of specific toxic gases and oxygen.