Product Overview
Self-calibrating smart positioner for precise valve control
Fast and Reliable Control for Rotary Single-Acting and Double-Acting Actuators
Electro-pneumatic positioner Bray Series 6A delivers proven reliability with precise digital control, easy installation, simple calibration, and cost-effectiveness. Rotary single-acting and double-acting actuator units are provided as standard. An intrinsically safe version is also available. The Bray BUS positioner offers all the features of the Series 6A, plus network communication and remote access to positioner parameters and diagnostics. Features Online adaptive control: During operation, the unit continuously optimizes control behavior and travel time in response to changes in pipeline media pressure. Diagnostics: Bray Series 6A positioners feature self-diagnostic checks for corrective and preventive maintenance. All diagnostics run continuously, with ongoing monitoring and recording capabilities. Air supply monitor: Another feature of the Series 6A is the internal monitor that triggers a fault signal alarm when the air supply fails. The alarm is displayed on the local LCD screen and can also be sent to a remote control panel. Local position adjustment: Valve position can be manually adjusted locally by removing the housing cover and using the buttons to override the remote command signal. Restrictor: Even the smallest pneumatic actuators can be precisely controlled via the internal restrictor. Position indicator: In addition to the LCD display, valve position is clearly visible from a distance via a yellow indicator light. Locking device: The Series 6A comes standard with a friction clutch locking device for high-vibration applications.
Technical Specifications
| Parameter | Value |
|---|---|
| Ports | 1/4” NPT or G1/4 |
| Communication Protocols | HART, Profibus PA, Foundation Fieldbus |
| Duty Cycle | Continuous |
| Supply Medium | Clean Dry Gas |
| Control Options | 4-20 mA, Communication Protocols |
| Protection Rating | Weatherproof: NEMA 4, 4X, IP66 Hazardous Location: ATEX/FM/CSA EEx ia/ib Explosion-proof ATEX/FM EEx d |
| Temperature Range | -22°F (-30°C) to +176°F (+80°C) |
| Mounting | VDI/VDE 3845 (NAMUR) |
| Supply Pressure | 20-102 psi (1.4-7 bar) |
| Enclosure | Glass fiber reinforced polymer with internal metal lining for EMC protection, aluminum, stainless steel |
| Certifications | ATEX, Bureau Veritas, CCC, CSA, FM, IECEx, InMetro, TR CU, UA.TR.089 |
| Application | Double-Acting and Single-Acting, Direct and Reverse |
Features and Benefits
Self-Calibration
Calibration is easily performed by entering just three parameters on the keypad and pressing a button. The calibration process is completed within 5 minutes, automatically determining travel limit stop positions, then measuring and recording parameters for the open and closed positions.
Explosion Protection
Designed for hazardous and harsh applications, the Series 6A explosion-proof positioner incorporates all the features of the explosion-proof enclosure with weatherproof sealing. The auto-calibration keypad buttons in the explosion-proof unit are mounted externally and easily accessible behind a flip plate. Local control is available without removing the housing cover, even during operation. The LCD display is visible through a sodium glass explosion-proof window. The weatherproof/explosion-proof enclosure meets NEMA 4, 4x, 7, and 9 specifications and is constructed of die-cast aluminum with an epoxy coating for chemical and corrosion protection. Weatherproof stainless steel construction is available upon request.