Industrial processes often need to be carried out in a hazardous atmosphere or when hazardous materials such as explosive gases, dust or flammable liquids are present. Such substances can be ignited by sufficient energy coming from sources like electrical sparks, open flames, and hot surfaces. The equipment installed in these areas must therefore be planned such that it does not represent an ignition source.
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Optoelectrical sensors are widely used in industrial automation. Clean, dust-free and dry environment is usually essential for proper operation of photoeyes. In many applications in dirty and harsh environment, optical sensors are still the best choice. For instance in steel mills we find extreme heat in steel and metal production.
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