The 585208 explosion proof actuator is used for on-off control of water, air, oil and other media compatible with the materials of construction. It complies with rigorous testing requirements for UL and CSA 4X enclosure ratings. Enclosure components and flame paths are manufactured from passivated 304 stainless steel. Two auxiliary dry contact limit switches are provided to confirm both open and closed valve position. An anti-condensation heater is included to protect against moisture and corrosion damage.
In North America, electrical equipment that is rated for use in hazardous locations is certified by UL (Underwriters Laboratories) or CSA (Canadian Standards Association). The hazard classification system is defined by classes and divisions. The class identifies the type of hazardous atmosphere, while the division indicates the level of risk associated with the atmosphere. For example, Class 1 indicates the presence of flammable gases or vapors in a location where an explosion could occur; while Class 2 refers to combustible dusts in a hazardous environment.
In order to be considered explosion proof, an electric motor must contain any internal explosion without rupturing and prevent ignition of the surrounding environment. This is accomplished by utilizing long, narrow passageways, known as flame paths, which cool gases from the internal pressure build-up during an explosion to below their ignition temperature. The motor also requires an enclosure that is able to withstand and contain any external explosions, without burning or igniting the surrounding environment. Explosion Proof Actuator UL Class 1 Div 1