Technical Specifications:

• Actuator Type: Single-Acting (Spring-Return)
• Input Signal: 4–20 mA DC (analog) or HART digital signal
• Output Signal: 20–100 kPa (3–15 psi) pneumatic output to actuator
• Stroke Range (S33): 33 mm (1.3 inches) — configurable via software
• Communication Protocols: HART 7, FOUNDATION Fieldbus H1, PROFIBUS PA
• Accuracy: ±0.5% of rated stroke
• Response Time: Less than 1 second (from 10% to 90% of stroke)
• Air Supply Pressure: 140 kPa to 700 kPa (20 to 100 psi)
• Ambient Temperature: -40°C to +80°C (-40°F to +176°F)
• Protection Rating: IP67 / NEMA 4X (weatherproof enclosure)
• Hazardous Area Approvals: ATEX Zone 1/2, Division 1/2, Class I, II, III
• SIL Rating: SIL 2 (IEC 61508), SIL 3 (IEC 61511) — option dependent
• Dimensions (W × H × D): Approximately 160 mm × 200 mm × 250 mm
• Weight: Approximately 4.5 kg

Functional Features:

• Auto-calibration — automatically learns valve stroke characteristics (initialization in 30 seconds)
• HART 7 / FOUNDATION Fieldbus / PROFIBUS PA communication for remote diagnostics
• Fail-safe position configurable (air-to-open or air-to-close on signal loss)
• Stroke limitation — adjustable upper and lower limits
• Diagnostic data: friction detection, seal leakage detection, response time monitoring
• Linearization function — corrects for non-linear valve characteristics
• Position feedback — continuous valve position monitoring (0–100%)

Structural Characteristics:

• Aluminum die-cast housing with epoxy coating
• IP67/NEMA 4X rated enclosure
• DIN rail or direct pipe mounting
• Large LCD display with navigation buttons for local configuration
• M20 × 1.5 air supply connection
• PG21 cable gland for electrical connections

Working Principle:
The positioner receives a 4–20 mA DC control signal (or digital signal via HART/Fieldbus) from the DCS/PLC. An internal microprocessor compares the commanded position with the actual valve position (measured by a built-in LVDT or potentiometer). The positioner adjusts the pneumatic output pressure (20–100 kPa) to the actuator until the actual position matches the commanded position. The closed-loop control achieves ±0.5% stroke accuracy. Digital communication enables remote configuration, diagnostics, and position monitoring.

Advantages:

• ±0.5% stroke accuracy — superior positioning performance
• Auto-calibration in 30 seconds — eliminates manual setup
• Multi-protocol communication (HART, FF, PROFIBUS PA)
• SIL 3 capable for safety-critical shutdown valves
• Single-acting design with configurable fail-safe position

Applicable Industries:

• Oil and Gas (Refining, Pipeline, Offshore)
• Chemical and Petrochemical
• Power Generation (Steam control, feedwater)
• Pulp and Paper
• Water and Wastewater

Installation Requirements:

• Mount directly on the valve actuator using the provided mounting bracket
• Connect air supply (140–700 kPa) to the positioner air inlet
• Connect 4–20 mA signal wires to the electrical terminals (shielded, twisted pair)
• For Fieldbus: connect the Fieldbus coupler to the positioner communication port
• Ensure the positioner orientation allows condensation drainage (vent hole at bottom)

Precautions:

• Verify the actuator is single-acting (spring-return) before installation
• Set the fail-safe position (air-to-open or air-to-close) correctly for the safety requirement
• Ensure air supply is clean and dry — use a filter/regulator upstream
• Do not exceed the maximum supply pressure of 700 kPa (100 psi)
• Perform auto-calibration after every mechanical adjustment to the valve