Rotork's new CMA series of all electric modulating actuators is suitably sized for linear, quarter-turn and rotary control valve and pump applications requiring energy savings and continuous modulation. The CMA actuators are powered by single-phase or direct current supplies, eliminating the need for air hoses and compressors used with similar pneumatic control-valve actuators. Set-up and configuration is easy via push-buttons and an internal six-segment LCD display. Resolution is 0.25% on linear and quarter-turn applications and 2 degrees on the multi-turn configuration. Other features include a permanently lubricated and maintenance-free drive train; a 4-to-20 mA loop-powered, feedback signal; and digital communication options including HART®, Foundation Fieldbus, Profibus, PakscanTM, RIRO, and Modbus.
