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Metso PDP401
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Metso PDP401

Product Introduction:​
The Metso PDP401 is a microprocessor-based industrial automation device used either as a smart valve positioner for pneumatic control valves in process plants, or as a compact Distributed Processing Unit (DPU) in Metso DNA / Valmet DNA distributed control systems. It converts a 4–20 mA analog control signal into a precise pneumatic output to position the valve, or performs real-time I/O scanning, logic, and communication in a DCS node.
Category:
Description
Key Technical Specifications:
  • Input Signal:​ 4–20 mA DC (HART 5/6/7 optional for positioner variant)
  • Supply / Air Pressure:​ 1.4–7 bar (20–100 psi), optionally up to 10 bar
  • Output Action:​ Single- or double-acting, reversible
  • Positioning Accuracy:​ ±0.5% of span (IEC 60534)
  • Communication:​ HART protocol; DPU variant supports Modbus TCP, Profibus-DP, EtherNet/IP, Profinet
  • Power Supply (DPU):​ 24 V DC (18–36 V DC)
  • Operating Temperature:​ -40 °C to +80 °C (positioner); -40 °C to +70 °C (DPU)
  • Protection / Enclosure:​ IP66 / NEMA 4X (positioner); IP65 (DPU)
  • Explosion Protection:​ ATEX, IECEx, FM, CSA (positioner version)
  • Mounting:​ Direct mount per ISO 5211/ VDI/VDE 3845(positioner); DIN rail (DPU)
Functional Features:
  • Auto-calibration and self-diagnostic functions
  • Configurable output characteristic (linear, equal %, quick opening)
  • High resistance to vibration and harsh environment
  • DPU variant: 1 ms cycle time, IEC 61131-3programming, redundant Ethernet ring
Application Scenarios:​
Pulp & paper, mining/mineral processing, power plant secondary air/gas control, chemical process loops, water treatment.
Installation Notes:
  • Ensure clean, dry instrument air; install air filter-regulator upstream
  • Use shielded twisted-pair cable for 4–20 mA + HART
  • For DPU: allow adequate cabinet ventilation; ground shield at one end only
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