Continuous monitoring of carbon monoxide and nitrogen dioxide in a welding shop.
There are over 70 different types of welding processes, all which produce a variety of hazardous gases. The gas or gases generated and their concentrations depend on the process used and the gas formation mechanisms. Common gases produced are carbon monoxide, nitrogen dioxide, ozone, hydrogen chloride, carbon dioxide, nitric oxide and other gaseous fluorides. The health hazards from welding gases are asphyxiation (lack of oxygen), fire, explosion and toxicity.
A well designed and maintained ventilation system is required to remove the air contaminants from the welder’s breathing zone. The installation of a fixed gas detection system to continuously monitor the levels hazardous gases help to protect welders and workers from exposure and risks to their health, providing a safer working environment.
Welding activities occur in many industries and the work environments vary in size, layout and setup. When planning installation and mounting locations for each gas detector you must consider the air flow patterns in the room. Entrances to the room, type of ventilation system, number of welding areas and any other sources of active air currents will affect the ability of the sensors to accurately read the gas levels.
Depending on the type of welding being done, additional hazardous gas monitoring may be required. For example, for Oxy-Acetylene welding, consideration should be given to monitoring combustible gas and Oxygen levels in the room where the cylinders of gas are stored. If there were to be a leak, Acetylene is flammable and explosive and high levels of Oxygen could cause an O2 enriched atmosphere.
If the area is classified as a hazardous area, the CXT Explosion Proof transmitter should be used.