Description
Schneider SRI986-BIDS7EBBNA
Technical Specifications
- Product type: Electro-pneumatic valve positioner
- Input signal: 4 to 20 mA
- Feedback: Valve position
- Communication: HART
- Supply air: 1.4 to 7 bar
- Accuracy: ±0.5 %
- Air connection: NPT 1/4
- Power: Two-wire loop
- Operating temperature: -40 °C to +85 °C
- Storage temperature: -50 °C to +90 °C
- Humidity: 5 % to 100 %
- Protection: IP66
- Explosion proof: ATEX / FM
- Mounting: Direct mount on valve
- Position feedback: 4 to 20 mA
Functional Features
- Precise 4 to 20 mA valve positioning
- HART remote configuration and diagnosis
- Auto calibration and self-tuning
- Selectable valve characteristic
- Valve stiction and wear diagnosis
- Supply air monitoring
- Limit alarm
- IP66 outdoor protection
- Explosion proof hazardous area
- Local mechanical position indicator
Application Scenarios
- Refinery control valve positioning
- Petrochemical flow control
- Chemical reactor pressure control
- Offshore platform valves
- Power plant feedwater control
Materials and Construction
- Housing: Aluminum alloy coated
- Gauge: Glass window
- Nozzle flapper: Stainless steel
- Seal: FKM
- Cable entry: M20 gland
- PCB: FR4
Structural Features
- Direct mount on actuator
- Rotatable position indicator window
- Side air supply and electrical entry
- Internal pneumatic amplifier and feedback
- Explosion proof sealed housing
- Spring feedback linkage
Working Principle 4 to 20 mA input is compared with actual valve travel from feedback linkage. Deviation drives nozzle flapper to change output air pressure on actuator. Positioner closes loop until travel matches setpoint. HART superimposes configuration and diagnostic data.
Installation Requirements
- Direct mount on valve bracket
- Connect feedback linkage to stem
- Clean dry instrument air
- 4 to 20 mA loop supply
- Explosion proof wiring rules
- Temperature -40 °C to +85 °C
- Run auto calibration after power-up
- Grounding
Precautions
- Instrument air must be filtered and dry
- Feedback linkage not over-tightened
- Follow explosion proof rules
- Periodically calibrate zero and span
- Store spares in dry packaging
- Clean position indicator window
- Verify supply air pressure
