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The Masoneilan SVI2 and SVI3 series are high-performance digital valve positioners, delivering precise, repeatable control for pneumatic linear and rotary valves in both single-acting and double-acting actuator configurations.
The SVI3 series (including SVI3-21121212 and SVI3-21121112) builds on the proven SVI2 platform with enhanced real-time diagnostics, predictive maintenance alerts, and low air consumption to reduce operational costs.
Designed for flexible integration, these positioners support multiple communication protocols (HART, FOUNDATION Fieldbus) and feature intuitive local calibration, making them suitable for both general and complex process control applications.
Technical Specifications
Parameter
Specification (SVI2 / SVI3 Series)
Input Signal
4–20 mA DC + HART / FOUNDATION Fieldbus (SVI3 optional)
Supply Air Pressure
1.4–7 bar (20–100 psi) standard; up to 10 bar optional
Air Consumption
Low steady-state consumption: ≤0.08 Nm³/h (SVI3)
Linearity
< ±0.5% FS (typical)
Repeatability
≤0.1% FS (SVI3) / ≤0.2% FS (SVI2)
Operating Temperature
-40 °C to +85 °C (standard); extended ranges available
Enclosure Rating
IP66 / NEMA 4X
Safety Certification
ATEX/IECEx, FM/CSA, SIL 3 capable (SVI3)
Application Industry
Oil & Gas: Deployed across upstream production, midstream pipelines, and downstream refining, with robust construction to withstand high-pressure, corrosive, and hazardous operating conditions.
Chemical & Petrochemical: Ideal for continuous process control in petrochemical plants, pharmaceutical manufacturing, and specialty chemical facilities, ensuring stable performance for critical control loops.
Power & Energy: Used in thermal power plants, combined cycle facilities, and renewable energy processes, supporting precise control of steam, gas, and water valves to optimize efficiency.
Common Problems & Solutions
Calibration Failure / Position Feedback Error
Symptom: Auto-calibration sequence fails due to misaligned position sensors or incorrect actuator travel range settings.
Solution: Verify actuator travel limits, adjust the feedback linkage to ensure full range coverage, and reset the positioner to factory defaults before re-running calibration.
No Valve Movement / Actuator Not Responding
Symptom: Input signal is received, but the pneumatic actuator shows no movement, and control actions have no effect.
Solution: Check supply air pressure for blockages or leaks, confirm tubing connections are correct, and inspect the positioner’s I/P converter for contamination or damage.
HART Communication Interruption
Symptom: The host system cannot communicate with the positioner, preventing parameter adjustments or diagnostic data retrieval.
Solution: Inspect loop wiring for loose connections, confirm loop resistance (250–600 Ω) meets HART specifications, and resolve address conflicts with other devices on the network.
Replacement Models
Masoneilan SVI2-21111111: The classic SVI2 base model with HART communication, suitable for replacing older SVI2 units or upgrading analog positioners in standard applications.
Masoneilan SVI3-21121212: High-performance SVI3 variant with advanced diagnostics and full communication capabilities, ideal for replacing aging SVI2 units where predictive maintenance is required.
Masoneilan SVI3-21121112: Compact SVI3 model with simplified features, designed for cost-effective replacement in non-critical applications that require reliable control without advanced diagnostics.
Why Buy From Us
Genuine Masoneilan Product Guarantee: All units are factory-new, authentic Masoneilan positioners with complete OEM test reports, certification documents, and manufacturer-backed warranties.
Comprehensive Technical Support: We provide full lifecycle assistance, including product selection guidance, installation training, calibration support, and on-site troubleshooting services.
Flexible Order Solutions: We offer customized configurations, competitive pricing, and flexible delivery schedules to align with your project timelines and budget requirements.
Stock & Delivery Time
Standard Configurations: Common SVI2/SVI3 models (including SVI3-21121212 and SVI3-21121112) are in stock, with delivery available within 3–7 working days after order confirmation.
Custom/Certified Models: Special configurations (e.g., extended temperature ranges, hazardous area certifications, remote-mount options) are delivered within 10–15 working days.
Emergency Expedited Service: For urgent breakdown or project needs, we offer priority processing and expedited shipping, with dispatch as fast as 24 hours for eligible in-stock units.
RFQ Form
To receive an accurate quote, please provide the following information:
Product details: Model number (e.g., SVI2, SVI3-21121212, SVI3-21121112), communication protocol, explosion-proof rating, and mounting style (direct/remote).
Application parameters: Valve/actuator type (linear/rotary, single/double acting), media type, operating pressure/temperature range, and loop control requirements.
Order information: Quantity required, target delivery date, project name, and contact details for quotation follow-up.
