Woodward 5501-365

Description

Input Signal: 4–20 mA DC (two-wire, loop-powered)
Output Signal: 3–15 psi (0.2–1.0 bar) pneumatic
Supply Voltage: 24 VDC nominal (operating range 18–32 VDC)
Supply Pressure: 80 psi (5.5 bar) regulated air supply required
Air Consumption: Low flow design, typically under 1 SCFM at full stroke

Accuracy: ±1% of full scale
Linearity: ±0.5% of full scale
Repeatability: ±0.25% of full scale
Deadband: Adjustable, typically less than 0.5%
Response Time: Less than 1 second to 90% of final position

Operating Temperature Range: -40°C to +85°C (-40°F to +185°F)
Storage Temperature Range: -50°C to +90°C (-58°F to +194°F)
Ambient Humidity: 5% to 95% non-condensing
Vibration Tolerance: Meets IEC 60068-2-6 standards
Ingress Protection: IP66 / IP67 rated enclosure (NEMA 4X compatible)

Housing Material: Cast aluminum alloy with epoxy-polyester powder coat finish
Internal Components: Stainless steel (316L) for wetted parts
Diaphragm Material: Nitrile rubber (NBR) / Fluoroelastomer (FKM) options available
Electrical Connectors: 1/2″ NPT conduit entries, DIN 43650 connector compatible

Structure: Compact modular housing with integrated I/P (current-to-pneumatic) converter and pneumatic relay
Mounting: Direct mount on actuator or wall/panel mount with bracket
Dimensions (approximate): 180 mm × 130 mm × 120 mm (L × W × H)
Weight: Approximately 2.5 kg (5.5 lbs)

Working Principle:
The 4–20 mA input current drives an internal torque motor that moves a flapper relative to a nozzle. This modulates backpressure in a pneumatic relay, which amplifies the signal to produce a proportional 3–15 psi output. The output pressure acts on a piston or diaphragm actuator to position the valve. Feedback from the valve stem position is compared to the input signal to achieve closed-loop proportional control.

Key Features:

• Two-wire loop-powered operation — no separate power supply required
• Fail-safe options available — air-to-open or air-to-close with spring return
• Adjustable zero and span — field calibration via potentiometers
• LED status indicators — power, signal, and fault diagnostics
• HART protocol compatible — digital communication for advanced diagnostics and configuration
• Intrinsically safe option available — for hazardous area classifications

Advantages:

• High precision and fast response for tight process control
• Robust construction suitable for harsh industrial environments
• Low air consumption reduces operating costs
• Simple installation with minimal wiring
• Proven reliability in continuous duty power generation service

Applicable Industries:

• Power Generation — gas turbine fuel control, steam turbine governing
• Oil & Gas — refinery process control, pipeline regulation
• Chemical / Petrochemical — flow and pressure regulation
• Pulp & Paper — steam and air damper control
• Water / Wastewater — valve position control in treatment plants

Compatible Actuator Types:

• Rotary actuators (quarter-turn valves, dampers)
• Linear actuators (globe valves, slide valves)
• Woodward EG, EH, EJ series actuators

Installation Requirements:

• Mount in a location protected from direct sunlight, rain, and excessive vibration
• Provide clean, dry, oil-free air supply at 80 psi (5.5 bar) with a filter-regulator
• Ensure proper electrical grounding per NEC / IEC standards
• Use shielded cable for signal wiring in high-EMI environments
• Verify supply voltage is within 18–32 VDC range before energizing

Usage Precautions:

• Do not exceed maximum supply pressure of 100 psi (6.9 bar)
• Do not operate without a filter on the air supply — contaminants will damage internal components
• Verify fail-safe direction (air-to-open vs air-to-close) matches process safety requirements before commissioning
• Perform zero and span calibration after installation and periodically during maintenance
• Replace diaphragm and seals according to scheduled maintenance intervals (typically every 2–3 years in harsh service)
• Do not disassemble in hazardous (classified) areas unless the unit is certified for that environment

Certifications:

• ATEX Zone 1 / Zone 2 (with intrinsic safety option)
• IECEx certified
• SIL 2 capable (with appropriate safety functions)
• UL / CSA listed
• CE marked

Documentation Reference:

• Woodward 5500 Series Installation & Operation Manual (Form 42607)
• Woodward 5501 Series Technical Data Sheet (Form 42512)