METSO D201832

Working Principle (D201832 Positioner):

The positioner receives a 4–20 mA DC setpoint from the DCS/PLC and continuously compares it with real-time valve stem position sensed by a non-contact Hall-effect or potentiometric feedback linkage. A digital piezo pilot stage modulates supply air to the actuator in closed-loop control, driving the valve to the commanded position. Auto-calibration establishes the zero, span, and deadband; adaptive gain tuning compensates for actuator friction and seat load variation. HART 7 protocol is superimposed on the 4–20 mA loop for configuration, diagnostics, and partial-stroke testing.

Category: Metso

Description

Working Principle (D201832L Expansion Module):

When fitted inside an NDX smart positioner, this module provides two independently isolated 4–20 mA analog outputs — Channel 1 defaults to valve position feedback (0–100%), Channel 2 is user-configurable to output diagnostic variables such as actuator air supply pressure, control deviation, stem friction index, or temperature.

Technical Specifications — D201832 (Smart Positioner):

Input Signal: 4–20 mA DC, loop-powered (8–30 V DC, nominal 24 V DC); HART 7.0
Supply / Output Pressure: 1.4–7.0 bar (20–100 psi) instrument air; output to actuator 0.2–1.0 MPa (3–15 psi typical)
Actuator Compatibility: Single-acting (spring-return) and double-acting pneumatic actuators
Travel / Rotation Range: Linear 10–100 mm; Rotary 0–90° (adjustable cams / direct coupling)
Accuracy (Linearity): ±0.5 % of Full Scale
Repeatability: ±0.1 % of Full Scale
Hysteresis: < 0.3 % of Full Scale
Response Time: < 2 s (full stroke, typical); < 1 s (small step change)
Steady-State Air Consumption: < 0.1 Nl/min
Enclosure Protection: IP66 / IP67, NEMA 4X
Housing Material: Die-cast aluminium with polyester powder coat; stainless steel fasteners & internal parts
Electrical Connection: M20×1.5 or ½″ NPT (cable gland)
Pneumatic Connection: ¼″ NPT or G¼″
Operating Temperature: –40 °C to +85 °C (–40 °F to +185 °F)
Humidity: 0–100 % RH (non-condensing treated)
Certifications / Safety: ATEX / IECEx Ex ia / Ex d, FM / CSA, SIL 2 capable per IEC 61508(SIL 3 in 1oo2 architecture), CE
Mounting: Direct mount per VDI/VDE 3845 (NAMUR); Neles / Jamesbury yoke bracket kits available
Diagnostics (HART): NAMUR NE 107 status, valve stiction detection, packing friction trend, air supply loss alarm, travel limit violation, cycle counter

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