CSA Class 2: Sensors & Flammable Dust

Coal dust is very flammable, and would create a classified location known as Class 2Hazardous locations are classified because of three different types of hazards. We’ve covered quite a bit about hazardous locations in the past month. Today, we want to discuss Class 2 locations, which are characterized by flammable dusts.

Dust that is flammable includes metals such as magnesium and aluminum; edibles such as flour, sugar, cocoa, or spices; carbon dusts like charcoal and coal, and many dry chemicals used in plastics and medicines (osha.gov).

These dusts can, in the right conditions, be equally as hazardous as vapors, or Class 1 locations – especially because dust often accumulates if not cleaned regularly. This is known as a dust blanket. In fact, for a sensor to be certified for Class 2 locations, it must allow a dust blanket to settle directly on the sensor without danger of ignition.

Like other classified locations, Class 2 locations are further defined by divisions and zones. Divisions, most popular in North America, distinguish between a hazard that is present under normal conditions (Division 1), and one that is an abnormal occurrence (Division 2).

Class 2 locations are quite common for our customers. While they do not require some of the same heavy-duty enclosure protections (e.g. explosion proof), they do require a sealed housing that runs at a low temperature.

Let us know if you have any questions about level and pressure sensors in Class 2 locations. You can get a hold of a helpful application engineer at 888-525-7300, or via our live chat, during business hours.

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