Product Details
The Foxboro SRD991 Intelligent Valve Positioner is a microprocessor-based digital positioner engineered to provide accurate, repeatable valve control for both linear and rotary pneumatic actuators. Designed for demanding industrial environments, the SRD991 combines high control precision, flexible communication options, and comprehensive valve diagnostics to reduce downtime and improve process stability.
The SRD991 supports HART communication for remote configuration and monitoring, offers automatic calibration routines, and delivers fast response times and stable control over a wide range of valve and actuator combinations. It is available in general purpose and explosion rated housings and can be paired with most pneumatic actuators and industry standard mounting kits.
Key Features
- Microprocessor based digital control algorithm for precise valve positioning
- HART communication for remote configuration, monitoring and diagnostics
- Automatic setup and auto calibration routines to simplify commissioning
- Supports linear and rotary actuator mounting (NAMUR and ISO patterns)
- Fast response and high repeatability for tight process control
- Integrated valve and actuator diagnostics including travel, friction and air consumption trends
- Robust field housings with optional explosion proof and weatherproof variants
- Compatible with a wide range of actuators and supply pressures
- Local user interface and pushbutton configuration plus software tools for advanced setup
Technical Specifications
| Parameter |
Specification |
| Model |
Foxboro SRD991 |
| Type |
Intelligent digital valve positioner / valve controller |
| Input Signal |
4–20 mA (primary), HART protocol |
| Communication |
HART; options for FOUNDATION Fieldbus or PROFIBUS PA depending on variant |
| Air Supply Pressure |
1.4 to 6.0 bar (20 to 87 psi) typical |
| Air Consumption |
Low (model and duty dependent) |
| Operating Temperature |
-40°C to +85°C (-40°F to +185°F) typical |
| Enclosure Rating |
IP66 / NEMA 4X standard; explosion proof options available |
| Materials |
Aluminum housing standard; stainless steel options available |
| Mounting |
Linear and rotary actuators (NAMUR / ISO 5211 adaptors) |
| Feedback |
Optional position transmitter feedback input (potentiometric or digital) |
| Accuracy / Repeatability |
High control accuracy; typical repeatability within 0.5% of span (model and setup dependent) |
| Power |
Loop powered for HART; separate power options for fieldbus versions |
| Certifications |
ATEX, IECEx, FM, CSA available on selected models |
| Accessories |
I to P converters, solenoid valves, mounting kits, position feedback modules |
Notes: Exact specifications depend on the SRD991 variant and selected options. Contact supplier for datasheet and model code details.
Applications
- Control of pneumatic control valves in oil and gas production and refining
- Chemical and petrochemical process control loops
- Power plant steam control and feedwater regulation
- Water and wastewater treatment plant valve control
- Pharmaceutical and food processing valve automation
- Pipeline pigging and flow control systems
- Any application requiring digital valve diagnostics, HART integration, and precise actuator control
FAQ
Q1: What communication protocols does the SRD991 support?
A1: The SRD991 supports HART for the standard version. There are variants and options that support FOUNDATION Fieldbus or PROFIBUS PA — check model selection.
Q2: Can SRD991 be mounted on both linear and rotary actuators?
A2: Yes. It is designed for easy mounting on both linear and rotary actuators using standard NAMUR or ISO mounting kits and couplers.
Q3: How is the SRD991 commissioned?
A3: Commissioning can be done locally using the built-in interface and pushbuttons, or remotely via HART handheld or host software. The unit offers automatic calibration routines to speed setup.
Q4: Does the SRD991 provide valve diagnostics?
A4: Yes. Built-in diagnostics include position feedback, travel monitoring, friction detection, air consumption trends and health indicators to support predictive maintenance.
Q5: Is there an explosion proof option?
A5: Yes. Explosion proof and hazardous area certified versions are available; certifications vary by region and model so please request the appropriate variant.
Q6: What air supply pressure is required?
A6: Typical operating air supply is 1.4 to 6.0 bar (20 to 87 psi). Exact requirements depend on actuator size and system configuration.
Q7: How do I select the correct model for my valve?
A7: Selection depends on actuator type, control signal, environmental rating, and desired communication protocol. Provide actuator torque, travel, and environmental conditions to the supplier for a recommended configuration.
Contact Us
For quotations, technical datasheet, configuration support, and after-sales service please contact:
Dr. Industry Group Co., Ltd
Phone: +86-15000725058
Email: edward.zhao@gongboshi.com
Website: https://www.shgongboshi.com/contactus.html
We provide original Foxboro products, configuration assistance, global shipping, and commissioning support.
Related Products
- Fisher DVC6200 Digital Valve Controller
- Masoneilan SVI3 SVI2 Digital Valve Positioners
- Samson 3730 Series Electropneumatic Valve Positioner
- Foxboro SRD960 / SRD998 positioner family (other Foxboro models)
- Flowserve Logix series digital positioners
Tags
Foxboro SRD991, intelligent valve positioner, digital valve controller, HART positioner, pneumatic positioner, valve diagnostics, control valve automation, Foxboro valve controller
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