The ATEX directive consists of two European Union directives describing what equipment and work environment is allowed in an environment with an explosive atmosphere.

Ampere Turns

The absolute value of magnetic flux determined by the number of copper wire turns in the coil and the magnitude of the current. Permissible temperature rise of the coil limits the magnitude of the power input. Heat makes the coil less efficient because it reduces the ampere turns and hence the flux density and the


A mechanical, electrical, or hydraulic device, or their combination, used to effect some predetermined linear, rotary, or oscillating movement. An actuator essentially converts hydraulic or air pressure into mechanical force. Basically, there are two types of actuators: uni-directional and bi-directional. In the uni-directional actuator, the piston moves in a single direction as a result of


Alternating current (AC) is an electric current that repeatedly changes its direction or strength, usually at a certain frequency or range of frequencies (50 or 60 Hertz).