Technical Specifications 4‑20 mA control signal input, pneumatic output to actuator, valve position mechanical feedback, HART communication interface. Air supply pressure scope matches pneumatic actuator requirement. Operating temperature ‑40 ℃ to +85 ℃.
Functional Features Receives 4‑20 mA set‑point signal from host control system. Collects mechanical valve position feedback. Executes high‑precision closed‑loop pneumatic positioning algorithm. Supports automatic stroke calibration. Provides HART digital communication for parameter access and fault diagnosis. Detects valve stick‑slip, supply air abnormal and internal hardware fault.
Application Scenarios Field intelligent positioner for pneumatic regulating valves. Applied in petrochemical, chemical, power and paper‑making process control loops.
Performance Parameters High‑precision valve positioning accuracy. Fast positioning response speed. Comprehensive on‑board equipment diagnostic capability.
Material Composition High‑strength engineering plastic housing. Internal pneumatic pilot valve assembly, position sensing mechanism, electronic control circuit board. Field wiring terminals, air supply and output pneumatic ports.
Structural Characteristics Field‑mount compact housing structure. Mechanical feedback lever connects to valve actuator stem. Pneumatic ports for instrument air supply and actuator chamber driving air. External wiring terminals for control signal and HART communication.
Working Principle 4‑20 mA set‑point signal is input to positioner electronic unit. Position sensor detects actual valve stem position. Micro‑processor compares set‑point and actual position, adjusts pilot valve output air pressure to pneumatic actuator until actual valve position matches target value. HART interface realizes digital parameter upload and download.
Installation RequirementsMount positioner onto pneumatic actuator according to installation dimension requirement. Connect instrument air supply pipeline and actuator air pipeline. Terminate 4‑20 mA control signal wiring. Perform automatic stroke calibration after power‑on, verify full‑stroke valve positioning performance.
Usage Notes Instrument air shall keep clean and dry. Mechanical feedback lever installation clearance shall comply with specification. Complete stroke calibration after mechanical disassembly. Hot‑signal wiring under live condition is prohibited.
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