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Foxboro SRD991 Intelligent Valve Positioner – Digital Accuracy with HART & Fieldbus Communication
Product Overview
The Foxboro SRD991 Intelligent Valve Positioner is a state-of-the-art digital positioner designed for high-precision control of both linear and rotary actuators. Engineered by Schneider Electric (formerly Invensys Foxboro), this positioner supports HART® 7 and Foundation Fieldbus™ protocols, delivering advanced valve diagnostics, automatic calibration, and reliable performance in harsh environments. With its explosion-proof design and IP66 protection rating, the SRD991 is ideal for critical process control applications in industries such as oil & gas, power, chemicals, and water treatment.
Key Features
Digital Communication: Supports HART 5/6/7 and Foundation Fieldbus for seamless integration
Precise Valve Control: Exceptional linearity (±0.2%) and repeatability (±0.1%)
Built-in Diagnostics: Monitors valve health, actuator friction, air pressure, and more
Auto Calibration: One-touch setup simplifies commissioning and tuning
Explosion-Proof Certified: ATEX, FM, CSA, and IECEx approvals for hazardous locations
LCD Display Interface: Multilingual user interface for local configuration
Rugged Construction: IP66-rated aluminum housing with corrosion-resistant coating
Universal Mounting: Compatible with a wide range of linear and rotary actuators
Product Attributes
Attribute
Value
Accessories
Solenoid Valve
Power
0.2-2.2KW
Body Design
Short Pattern
Control Range
0-100%
Temperature Of Media
Low Temperature
Air Supply
1.4 To 6.0 Bar
Signal Communication
HART 5 Or 7 Over 4-20mA
Operating Media
Air/Gas/Liquid
Technical Specifications
Parameter
Specification
Input Signal
4–20 mA with HART® communication
Communication Protocols
HART 5/6/7, Foundation Fieldbus
Supply Pressure
1.4 to 6.9 bar (20 to 100 psi)
Positioning Accuracy
≤ ±0.2% linearity
Repeatability
≤ ±0.1%
Response Time
≤ 100 ms
Mounting Type
Linear and rotary actuators (NAMUR interface)
Display
LCD screen with push-button control
Diagnostics
Valve friction, air leakage, deviation monitoring
Material
Anodized aluminum housing
Protection Rating
IP66 / NEMA 4X
Operating Temperature
–40 °C to +85 °C
Explosion-Proof Certifications
ATEX, IECEx, FM, CSA (Zone 1 / Div 1)
The Foxboro SRD991 Intelligent Valve Positioner combines digital precision with rugged reliability, making it an ideal solution for demanding industrial applications requiring accurate valve control and advanced diagnostics.
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...
Xiangjing (Shanghai) - Leading Distributor of Pneumatic and Electric Control Valves
Established in Shanghai, China, Xiangjing(Shanghai) Mechanical and Electrical Tech Co.,Ltd has been a trusted distributor of high-quality pneumatic and electric control valves for many years. With extensive industr...