Product Brief
L-suffix extended low-temperature variant of base D201138 valve positioner control module, optimized for permanent installation in arctic cold climate industrial facilities, retaining full SIL 2 safety certification and identical HART communication functionality of standard D201138 hardware.
Technical Specifications
- Loop Supply Power: 8–30 V DC loop-powered, 12 mA nominal static current draw
- Position Control Accuracy: ≤ ±0.4% full valve stroke
- Repeatability: ≤ ±0.18% full stroke
- HART Protocol Support: HART 5 / 6 / 7 multi-drop communication capable
- SIL Safety Rating: IEC 61508 SIL 2, SFF >90% safe failure fraction
- Operating Temperature Range: -50 °C to +85 °C (L-grade extended cold range)
- Shock Resistance: 20 g mechanical impact, 6 ms pulse duration
- Enclosure Protection: IP66 / NEMA 4X fully sealed die-cast housing
- Physical Dimensions: Identical footprint to D201138 (82 × 64 × 36 mm)
- Net Weight: 0.40 kg
- Hazardous Certifications: ATEX IIC T4, IECEx, FM Class I Div 1
Functional Features
- Low-temperature optimized internal lithium buffer battery for cold-start diagnostic logging
- Enhanced piezo drive circuit thermal compensation for sub-zero temperature stability
- All standard D201138 native functions: auto-calibration, PST partial stroke testing, fault logging
- Low-temperature rated conformal PCB coating preventing moisture ice crystal formation
- Cold-temperature compatible EPDM gaskets with -50 °C continuous flexibility rating
Material Composition
- Enclosure: Low-temperature impact-resistant die-cast aluminum with modified epoxy coating
- PCB Coating: Low-temperature flexible acrylic conformal coating
- Sealing Gaskets: Specialized cold-resistant EPDM rubber compound
- Internal Wiring: Teflon insulated stranded copper wire rated for -60 °C continuous operation
Structural Characteristics
- Interchangeable mechanical mounting footprint fully compatible with standard D201138 NDX actuators
- Reinforced cable gland assembly with dual-layer cold-temperature sealing rings
- Low-temperature lubricated internal position feedback gear assembly
- Identical dual piezo pilot valve manifold interface as base D201138
Working Principle
Signal processing, stroke feedback regulation, and HART communication operating logic identical to Metso D201138 base model. All internal electronic circuits integrate dedicated temperature compensation algorithms and cold-rated passive components to eliminate performance degradation at temperatures down to -50 °C. The integrated backup lithium buffer battery maintains fault log memory retention during extended sub-zero power interruption events.
Core Advantages
- -50 °C minimum operating temperature enables arctic mine, LNG, and northern pipeline valve installations
- Zero performance deviation in stroke control accuracy across full cold temperature operating band
- Direct mechanical interchangeability with standard D201138 for field retrofit upgrades
- Low-temperature resistant sealing components eliminate ingress failure risk in freeze-thaw cycles
- Retains full SIL 2 safety compliance without temperature-based functional derating
Applicable Industries
Arctic mineral mining, northern natural gas transmission pipelines, LNG storage terminals, cryogenic chemical processing, cold-climate pulp & paper mills, northern offshore oil platforms
Installation Mandatory Requirements
- Mount exclusively to Neles NDX series linear/rotary valve actuator assemblies
- All field wiring insulation must carry minimum -60 °C cold temperature rating
- Cable gland dual sealing rings must be fully seated and compressed during assembly
- Pneumatic supply air must be fully dehydrated dew point ≤ -60 °C to prevent internal ice formation
- Mechanical feedback linkage lubrication must utilize low-temperature synthetic grease
Operational Maintenance & Usage Restrictions
- Quarterly cold-temperature functional diagnostic scan required for arctic site deployments
- Replace internal lithium buffer battery every 5 calendar years for continuous cold-site operation
- Avoid rapid temperature cycling exceeding 30 °C per hour thermal swing rate
- Do not expose to direct contact with liquid cryogenic process media
- HART handheld calibrator operation below -40 °C requires insulated protective housing for tool hardware
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