Foxboro SRD991 Intelligent Valve Positioner Schneider HART PROFIBUS FF Digital Positioner SIL3
Product Overview
The Foxboro SRD991 Intelligent Positioner delivers precise, reliable pneumatic valve control with built-in intelligence for modern process plants. Combining robust mechanical design, advanced diagnostics, and flexible communication, it reduces commissioning time, improves valve health visibility, and supports safety-critical applications up to SIL 3.
Key Features
- Graphical multilingual LCD + three local keys for full configuration without external tools
- Multiple Autostart modes optimized for standard, small, or large actuators
- Premium diagnostics: online friction, valve signatures, Partial Stroke Test (PST) for ESD valves
- Low-load HART (420 Ω), FISCO-compliant fieldbus protocols
- Rugged IP66/NEMA 4X housing; intrinsic-safety versions available
- Plug-in option boards for position feedback, binary I/O, and limit switches
- Direct mounting capability and original feedback levers for minimal backlash
Technical Specifications
| Parameter | Value |
|---|---|
| Input / Communication | 4–20 mA, HART, PROFIBUS-PA, FF H1 |
| Supply pressure | 1.4–6 bar (up to 7 bar with spool valve) |
| Travel | Linear 8–260 mm; Rotary ≤95° (opt. 300°) |
| Enclosure | IP66 / NEMA 4X, aluminium (stainless steel option) |
| Operating temperature | –40 to +80 °C |
| Display | Multilingual graphical LCD + mechanical indicator |
| Diagnostics | Self-diagnostics, NE107 status, PST, friction |
| Safety | SIL 3 capable |
| Connections | Pneumatic G¼ / ¼ NPT; Electrical M20 / ½ NPT |
Applications
Continuous process control, safety instrumented systems (SIS), emergency shutdown (ESD) valves, predictive maintenance programs, and plants requiring HART or fieldbus integration.
Frequently Asked Questions
- Q: Does the SRD991 support Partial Stroke Testing?
- A: Yes, PST is available for verifying ESD valve functionality without full stroke.
- Q: What air quality is required?
- A: Clean, dry, oil-free air per ISO 8573-1 (solids class 2, oil class 3).
- Q: Is local configuration possible without a handheld or PC?
- A: Yes – full configuration is available via the three push-buttons and LCD.
Contact Us
Phone/WeChat/WhatsApp: +8613916209596
Email: svetama@gbsxj.com
Related Products
SRD960 positioner, Foxboro control valves, DTM-based diagnostic software (VALcare / Valve Monitor), pressure gauges, volume boosters, stainless-steel housing variants.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.