Explosion Proof Actuator UL Class 1 Div 1.
For use in gaseous fire suppression systems, this explosion-proof actuator offers a solution to overcoming challenges in hazardous locations. It utilizes design features from supervised latching solenoid actuators to meet the force output requirements of these types of systems and also provides an integrated installation supervision system that meets UL and NFPA regulations. This new actuator also significantly reduces the number of leak points in the system, enhancing its overall reliability.
In North America, a hazardous location is described as having an atmosphere of explosive or flammable gases, vapors or liquids in continuous, long-term or frequent presence during normal operation. It is typically rated Class 1, Division 1 or Zone 0, with the former defined as having an explosive atmosphere for all or a large portion of operating conditions and the latter defined as having an explosive atmosphere only for some or a limited amount of time.
The hazardous location actuator is certified to operate safely in hazardous locations classified by UL (North America), ATEX (Europe/International) or CSA (Canada). These types of motors are not designed to survive an external explosion, but rather to prevent internal ignition of explosive atmospheres. This is accomplished through limiting energy and separating the ignition source from the environment through an enclosure with flame paths that are produced from passivated stainless steel.
Additional requirements for a hazardous location actuator include tight control of plating inside the flame paths and harsh testing to meet UL50E 4X rating. The actuator is also equipped with two auxiliary dry contact limit switches to confirm open and closed valve positions, as well as an anti-condensation heater to protect against damage from condensation. Explosion Proof Actuator UL Class 1 Div 1