Fluke 721EX User Manual - Page 12
Ex-Hazardous Areas, Measuring Pressure, Explosive Atmospheres in Europe and as Explosive Gas
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721Ex Users Manual Ex-Hazardous Areas An Ex-hazardous area as used in this manual refers to an area made hazardous by the potential presence of flammable or explosive vapors. These areas are also referred to as hazardous locations. The Product has been designed for use in Ex-Hazardous Areas. These are areas where potentially flammable or explosive vapors may occur. These areas are referred to as hazardous (classified) locations in the United States, as Hazardous Locations in Canada, as Potentially Explosive Atmospheres in Europe and as Explosive Gas Atmospheres by most of the rest of the world. The Product is designed as intrinsically safe. This means that connecting the Product to equipment that is used within intrinsically-safe circuits will not cause an ignition-capable arc as long as the entity parameters are suitably matched. Warning To prevent possible personal injury, check entity parameters before making any connections to this device. Measuring Pressure Warning For safe operation and maintenance of the Product, Refer to the table of ranges and resolutions at the back of the manual for information about overpressure and burst pressure ratings. Pressure sensors can be damaged and personnel injury can occur due to improper application of pressure. Vacuum should not be applied to any gauge pressure sensor. The Product display shows "OL" when an inappropriate pressure is applied. If "OL" is seen on any pressure display, reduce or vent pressure immediately to prevent equipment damage or possible personnel injury. "OL" is shown when pressure >120 % of the nominal range of the sensor or when a vacuum >2 PSI is applied on gauge range sensors. 4