Meta Description & Product Overview
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.
Key Features & Benefits
✅ 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
Technical Specifications
| 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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