Foxboro SRD991 Intelligent Valve Positioner Advanced Digital Positioning with HART & Fieldbus
The Foxboro SRD991 Intelligent Valve Positioner is a high-performance, microprocessor-based digital valve controller designed for demanding industrial process applications. Offering compatibility with HART ® 7 and Foundation Fieldbus ™, the SRD991 ensures accurate valve positioning, smart diagnostics, and predictive maintenance capabilities. Manufactured by Schneider Electric (formerly Invensys Foxboro), it supports both linear and rotary actuators and features auto-calibration, IP66 protection, and a wide operating temperature range, making it an ideal solution for industries such as oil & gas, power generation, chemicals, and water treatment.
- High Precision Positioning - Linearity better than ±0.2%, repeatability ±0.1%
- Dual Protocol Support - Communicates via HART 7 or Foundation Fieldbus
- Advanced Diagnostics - Continuous monitoring of valve stroke, friction, air supply, and actuator performance
- Auto Setup & Calibration - Simplified commissioning with push-button or remote configuration
- Explosion-Proof Design - Certified for hazardous area use: ATEX, CSA, FM, IECEx
- Flexible Mounting - Supports both linear and rotary actuators with NAMUR compliance
- Durable Housing - IP66-rated, corrosion-resistant aluminum alloy enclosure
- Integrated LCD Display - Intuitive user interface with multi-language support
| Parameter | Specification |
|---|---|
| Input Signal | 4-20 mA DC with HART 7 / Foundation Fieldbus |
| Supply Pressure | 20-100 psi (1.4-6.9 bar) |
| Positioning Accuracy | ≤ ±0.2% linearity |
| Repeatability | ≤ ±0.1% |
| Mounting Type | Linear and rotary actuators (standardized interfaces) |
| Auto Calibration | Yes (automatic stroke and pressure tuning) |
| Diagnostics Functions | Valve deviation, leakage detection, pressure trends |
| Ingress Protection | IP66 |
| Operating Temperature | -40 °C to +85 °C |
| Display Interface | LCD with keypad |
| Explosion-Proof Certifications | ATEX, FM, CSA, IECEx (optional models) |
| Communication Protocols | HART 5/6/7, Foundation Fieldbus |
| Body Material | Aluminum alloy with corrosion-resistant coating |
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