Rotork CMA process valve actuators

Designed for quarter-turn, rotary or linear operation, Rotork CMA actuators perform numerous process control valve, metering pump and damper applications demanding precise position control and continuous modulation. Explosion-proof certification to international standards is available for hazardous area applications.

Local controls now offer manual operation at the valve, combined with an LCD display of valve position which also incorporates critical and non-critical fault symbols. Control selection knobs enable selection of local, stop or remote operation and open or close input commands in the local control mode. Each mode can be locked in place to prevent unauthorised operation. The LCD display shows the valve position as a precise percentage of total valve travel.

For fail-to-position performance, a reserve power pack provides the actuator with the ability to perform a predetermined action on power failure, while the power pack also preserves position indication on the LCD display. On restoration of mains power, the power pack is recharged. Action on power loss is easily configured with the standard CMA HMI interface as part of the user-friendly actuator set-up menu, utilising a 6-segment LCD display and push-button configuration.

The maintenance-free CMA drive train can be mounted in any orientation. Accepting an industry-standard 4-20 mA control signal, the CMA provides accurate, repeatable and backlash-free positional control. Resolution is 0.2% on linear and quarter-turn applications, 2° on the multiturn models. Network compatibility encompasses Rotork Pakscan, HART, Profibus, Modbus, DeviceNet and Foundation Fieldbus.