Foxboro P0916AE Pneumatic Valve Positioner

Technical Specifications:

• Input Signal: 4-20 mA DC (2-wire or 4-wire transmitter powered)
• Output Signal: 3-15 psi (0.2-1.0 bar) gauge
• Supply Pressure: 20 psi (1.4 bar) nominal, range 14-40 psi (1.0-2.8 bar)
• Actuator Type: Double-acting
• Response Time: ≤ 1 second (typical)
• Accuracy: ±1% of span
• Linearity: ±1% of span
• Ambient Temperature: -40°F to 185°F (-40°C to 85°C)
• Process Temperature: -40°F to 300°F (-40°C to 150°C)
• Housing Material: Aluminum die-cast
• Mounting Type: Direct mount (top-mounted on actuator)
• Enclosure Rating: IP66 / NEMA 4X (standard)
• Weight: Approximately 8 lbs (3.6 kg)

Functional Features:

• Force-balance principle operation for high accuracy
• Zero and span adjustments accessible from the front
• Feedback lever with adjustable range
• Internal relay for open/close limit switching (optional)
• Fail-safe action configurable (air-to-open or air-to-close)

Performance Parameters:

• Deadband: Less than 0.5% of travel
• Hysteresis: Less than 0.5% of span
• Supply Effect: Less than 0.25% per 1 psi supply change
• Bench Set Range: 20-100% of valve travel

Structural Features:

• Compact aluminum die-cast housing with corrosion-resistant coating
• Pneumatic relay with flapper-nozzle mechanism
• Electromagnetic force motor for input signal reception
• Adjustable feedback cam for valve stroke calibration
• Terminal block for electrical connections

Working Principle:
The positioner receives a 4-20 mA DC control signal from the controller. The current drives an electromagnetic force motor that generates a force proportional to the signal. This force is balanced against a feedback force from the valve stem position via a mechanical linkage. Any imbalance moves the flapper relative to the nozzle, changing the backpressure, which is amplified by the pneumatic relay to drive the actuator until the valve reaches the commanded position. This closed-loop force-balance ensures the valve position matches the control signal precisely.

Advantages:

• High accuracy with ±1% of span performance
• Fast response time under 1 second
• Robust construction suitable for harsh industrial environments
• Simple calibration with front-panel zero and span adjustments
• Wide supply pressure tolerance from 14 to 40 psi
• Compatible with I/A Series DCS systems

Applicable Industries:

• Oil and Gas
• Petrochemical
• Chemical Processing
• Power Generation
• Pulp and Paper
• Water and Wastewater Treatment
• Mining and Minerals

Installation Requirements:

• Mount directly on the valve actuator using standard mounting brackets
• Ensure air supply is clean, dry, and oil-free
• Position wiring conduit entry at the bottom or side of the housing
• Maintain minimum 6 inches (150 mm) clearance around the positioner for heat dissipation

Usage Notes:

• Verify input signal range matches positioner calibration (4-20 mA)
• Perform zero and span calibration after installation
• Inspect air supply filter/regulator regularly
• Do not exceed maximum supply pressure of 40 psi (2.8 bar)