METSO D201925 SPDT (Single Pole Double Throw) or Inductive Proximity
The Metso (now Neles/Valmet) D201925 is a specialized, high-performance Position Indicator / Limit Switch Box component, typically utilized within the Neles D-series or EasyLink modular platforms.
It is designed to provide precise mechanical-to-electrical feedback regarding the position of rotary valves in industrial process automation.
1. Product Description
The D201925 serves as a core internal component for valve monitoring systems. It acts as the interface between the pneumatic actuator’s mechanical rotation and the control system (PLC/DCS).
This specific part number often refers to a Switch/Sensor assembly or a Terminal Card used inside the Neles limit switch boxes (such as the DXP or DXR series).
It is engineered to withstand harsh vibration and corrosive environments common in chemical plants, refineries, and offshore platforms.
2. Technical Parameters
Note: As a specialized component, parameters may vary slightly based on the housing assembly it is installed in.
| Parameter | Specification |
| Component Type | Switch Module / Limit Switch Card |
| Contact Type | SPDT (Single Pole Double Throw) or Inductive Proximity |
| Voltage Rating | 24 V DC / 120 V AC (Dependent on switch configuration) |
| Housing Compatibility | Neles D-Series, DXP, DXR, and DKX Enclosures |
| Enclosure Rating | Typically IP66/IP67 (when installed in the correct housing) |
| Operating Temperature | -40°C to +80°C (-40°F to +176°F) |
| Connection Type | Screw terminals / Plug-in modular headers |
| Certification | Often ATEX/IECEx certified for hazardous zones |
3. Product Advantages & Features
Modular “EasyLink” Integration: Designed for rapid installation and replacement without needing to recalibrate the entire valve assembly.
High Vibration Resistance: Internal components are secured to prevent “contact bounce” or signal loss in heavy-duty industrial environments.
Gold-Plated Contacts: Often features high-quality contact surfaces to ensure reliable signal transmission even at very low currents (dry circuits).
Visual Feedback: Usually compatible with “Beacons” or “Pointers” on the exterior of the switch box for local operator inspection.
Corrosion Protection: Treated with specialized coatings to resist acidic or salty atmospheres.
D201925
D201925
4. Application Cases
Oil & Gas Refineries: Monitoring the “Open/Closed” status of emergency shutdown valves (ESV).
Pulp & Paper Mills: Used on rotary segment valves for controlling flow in corrosive liquor lines.
Chemical Processing: Feedback for automated batching systems where precise valve timing is critical for safety.
Water Treatment: Signal feedback for large-scale butterfly valves in filtration and distribution.
5. Related & Other Models in the Series
The D201925 is part of the extensive Neles / Metso Monitoring family. Related components and assemblies include:
DXP Series: The “Universal” metal switch box (Ex d / Flameproof).
DXR Series: Composite resin switch box for highly corrosive environments.
D201924 / D201926: Variations in the circuit card or sensor type (e.g., different proximity sensors like P+F or IFM).
Neles ND9000: The high-end intelligent valve controller (Positioner) which provides digital diagnostics beyond simple limit switches.
Switch Types: Often fitted with Crouzet microswitches or Pepperl+Fuchs proximity sensors.
