Empire Magnetics’ PT Series Hazardous Area Step Motors are sealed and equipped with air fittings for pressurization. With an optional temperature sensor, PT Hazardous Area Step Motors can be easily designed into a system which meets NFPA requirements for Class I, Class II and Class III hazardous locations.
In a typical installation—such as spray painting, printing, flour mills, fuel processing, alcohol production, chemical processing or rocket fuel machining—the motor is remotely located in a hazardous area. Air lines, power and temperature sensor cables run to the control station in a non-hazardous area. Protective conduit shields cabling from mechanical damage. At the control station, a temperature indicator with a set-point alarm displays motor temperature. The set-point alarm output will cut power to the drive if temperature exceeds the set-point. A differential pressure switch on the return air line monitors motor pressure. If pressure fails, this switch also cuts power to the drive. When power is applied, the motor undergoes a purge delay period before being energized.