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Equipment and products operating in hazardous areas are required to meet stringent criteria. They must be 'protected' to avoid the possibility of them becoming a source of ignition. Weighing systems are often an integral part of a process within the hazardous area and therefore must have suitable protection.

Hazardous areas are essentially designated places where the presence of certain materials, such as gases, dust or fibres make an explosion probable if a source of ignition is introduced. (Probably the best known example of a hazardous area is the petrol station.)

Three essential elements are required for an explosion to take place: