Electro-Pneumatic Positioners Offer Reliable Control

Aug. 4, 2009

Bray Controls recently announced the Series 6A line of Intelligent Electro-Pneumatic Positioners. These microprocessor controlled positioners offer precise flow control and advanced digital communication. Utilizing proven technology, the Series 6A features reliability in the field plus the lowest air consumption on the market. For use with either double or single acting pneumatic actuators, the positioners can accept an analog 4-20 mA input or BUS intelligent HART, FOUNDATION Fieldbus or PROFIBUS PA input. Both waterproof (NEMA 4, 4X/IP66) and explosion proof (NEMA 4, 4X, 7 and 9) enclosures are offered. A waterproof stainless steel enclosure is available upon request.

Piezo valve technology controls the air supply within the Series 6A, producing zero bleed during steady state and minimal consumption during operation. The energy savings alone can pay for the cost of the unit within a year. In addition, the power conservation and reduced noise are beneficial to the environment.

An LCD display provides visual confirmation of valve position in precise one-degree increments. The positioner’s operating status and alarm messages are also shown. With the enclosure cover removed, keypad push buttons can easily perform a variety of functions, including automatic calibration, confirmation of the setpoint, progress to the setpoint, potentiometer alignment, diagnostic checks and error messages. The LCD display shows the information entered in the keypad.