Foxboro P0916FH Field-Hardened Pneumatic Valve Positioner

Technical Specifications:

• Input Signal: 4-20 mA DC
• Output Signal: 3-15 psi (0.2-1.0 bar)
• Supply Pressure: 20 psi (1.4 bar) nominal, range 14-40 psi (1.0-2.8 bar)
• Actuator Type: Double-acting
• Ambient Temperature Range: -58°F to 212°F (-50°C to 100°C) — extended range
• Vibration Rating: Up to 5g RMS (10-500 Hz)
• Housing Material: Cast aluminum with enhanced sealing
• Enclosure Rating: IP67 / NEMA 6P (upgraded from standard IP66)
• Response Time: ≤ 1.5 seconds (slightly extended due to damping)
• Accuracy: ±1.5% of span (slightly relaxed for extreme environment)
• Coating: Marine-grade epoxy with UV resistance
• Conformal Coating: Applied to all internal PCBs and terminals

Functional Features:

• Extended temperature range for arctic and tropical deployment
• Enhanced vibration damping with internal shock mounts
• Upgraded sealing — all gaskets are Viton® (FKM) rated
• Conformal-coated electronics for humidity and salt spray protection
• Stainless steel (316L) hardware throughout
• Drain fitting on housing bottom for condensate removal

Performance Parameters:

• Deadband: Less than 1% of travel
• Hysteresis: Less than 1% of span
• MTBF (Mean Time Between Failures): 100,000 hours (field-hardened rating)
• Salt Spray Resistance: 500 hours per ASTM B117 (no corrosion)
• UV Resistance: 1000 hours per ASTM G154 (no degradation)

Structural Features:

• Cast aluminum housing with reinforced ribbing for vibration resistance
• Internal potting compound on electronic assemblies
• Viton® O-ring seals on all housing joints
• 316L stainless steel mounting hardware
• Cable glands with IP68 rating (upgraded from standard)
• Internal desiccant pack for moisture control
• Drain valve at lowest point of housing

Working Principle:
The P0916FH operates on the same force-balance principle as the standard P0916AE. The field-hardened modifications do not alter the fundamental operating principle but add environmental protection layers: conformal coating prevents moisture-induced short circuits, Viton® seals maintain integrity across the extended temperature range, internal potting absorbs vibration energy, and the drain fitting prevents water accumulation. The positioner continues to convert 4-20 mA DC to 3-15 psi with the force-balance loop, but all components are selected and treated to survive conditions that would degrade a standard unit.

Advantages:

• Operates in extreme environments where standard units fail
• Extended MTBF reduces maintenance frequency
• Conformal coating and potting protect electronics permanently
• Viton® seals maintain integrity from -50°C to +100°C
• Reduced total cost of ownership in harsh applications

Applicable Industries:

• Arctic Oil and Gas (Alaska, North Sea, Siberia)
• Desert Refineries (Middle East, Southwest US)
• Offshore Platforms (tropical and arctic)
• Mining (vibration, dust, temperature extremes)
• Marine and Shipboard (salt spray, humidity)
• Outdoor Water Treatment (washdown, freeze/thaw)

Installation Requirements:

• Use 316L stainless steel fasteners only
• Apply anti-seize compound on all threaded connections
• Install drain fitting with tube to safe discharge point
• Route cable entries below the housing to prevent water ingress
• Torque all connections to Foxboro-specified values