The Foxboro SRD991 Smart Valve Positioner is a high-performance intelligent device designed for precise valve control in modern process automation systems. It combines advanced digital technology, reliable communication protocols, and diagnostic capabilities to ensure maximum efficiency, accuracy, and plant safety.
Engineered by Foxboro (Emerson), the SRD991 represents the next generation of intelligent valve positioners, offering superior stability and long-term reliability for pneumatic control valves used across industries such as oil & gas, petrochemical, power generation, water treatment, and pharmaceuticals.
High-Precision Digital Control
The SRD991 uses microprocessor-based digital signal processing (DSP) technology to provide accurate valve positioning, fast response, and minimal hysteresis.
Multi-Protocol Communication
Compatible with HART, FOUNDATION Fieldbus, and Profibus PA, the SRD991 enables real-time data exchange with DCS, PLC, or asset management systems.
Comprehensive Self-Diagnostics
Built-in diagnostic tools continuously monitor valve performance, air supply, and actuator behavior. Early fault detection reduces downtime and maintenance costs.
Automatic Calibration
The auto-calibration feature allows quick setup and configuration, ensuring precise zero and span adjustments without manual tuning.
Durable Industrial Design
The housing is made of corrosion-resistant aluminum alloy, rated for explosion-proof and harsh environments. It performs reliably under extreme temperature, vibration, and humidity.
| Parameter | Description |
|---|---|
| Input Signal | 4–20 mA DC (HART Communication) |
| Power Supply | 24 V DC nominal |
| Communication Protocols | HART, Fieldbus, Profibus PA |
| Valve Type Compatibility | Linear or Rotary Pneumatic Actuators |
| Operating Pressure | Up to 6 bar (87 psi) |
| Material | Aluminum alloy or stainless steel |
| Protection Class | IP66 / NEMA 4X |
| Mounting Standard | NAMUR |
| Explosion Proof Rating | ATEX, FM, IECEx Certified |
| Ambient Temperature Range | -40°C to +80°C |
Oil & Gas Process Control
Petrochemical Plants
Power Generation Units
Water Treatment and Environmental Systems
Pharmaceutical and Food Production Lines
The Foxboro SRD991 is widely used in critical control loops where accuracy, feedback reliability, and remote diagnostics are essential.
Enhances process accuracy and repeatability
Reduces manual maintenance with predictive diagnostics
Supports remote monitoring and configuration via HART
Extends actuator and valve life
Easy installation and configuration
| Feature | Conventional Pneumatic Positioner | Foxboro SRD991 Smart Positioner |
|---|---|---|
| Signal Type | Analog only | Digital (HART / Fieldbus) |
| Control Accuracy | Moderate | High Precision |
| Diagnostics | None | Full Self-Diagnostics |
| Calibration | Manual | Automatic |
| Maintenance | High frequency | Predictive & Remote |
Dr. Industry Group Co., Ltd., based in Shanghai, China, is a trusted supplier of Foxboro SRD991 Smart Valve Positioners with extensive experience in control valves, valve accessories, and industrial automation components. We provide:
Genuine Foxboro products with fast delivery
Professional valve matching and technical support
Global export service covering Asia, the Middle East, and Europe
Email: edwardzhao@gbsxj.com
Phone: +86-15000725058
Website: www.shgongboshi.com
