Calibration in hazardous areas

摘要

What is a hazardous area? A hazardous area is an area (inside or outside) that contains, or may contain, flammable substances. The flammable substance may be a liquid, gas, vapor, or dust. The area may contain a flammable substance all of the time, most of the time, or only in specific situations, such as shutdowns or incidents. In such a hazardous area, an explosion or fire is possible if all the three conditions of the "explosion triangle" are met. These three conditions are fuel (a flammable substance), a source of ignition (or heat), and oxygen (air). The explosion triangle is often presented as a triangle, therefore the name.