FOXBORO SRI986-BIDS7ZZZNA Intelligent Electro-Pneumatic Valve Positioner

Description

FOXBORO SRI986-BIDS7ZZZNA Intelligent Electro-Pneumatic Valve Positioner

Product Dimensions：

The Foxboro (by Schneider Electric) SRI986-BIDS7ZZZNA is an Electro-Pneumatic Positioner designed for the operation of pneumatic valve actuators. It is a high-performance analog device that ensures the valve stem position is directly proportional to the electrical input signal.

Product Detailed Description

The SRI986 series is known for its ruggedness and simplicity in the field of process automation. The SRI986-BIDS7ZZZNA model specifically converts a 4 to 20 mA current signal into a proportional pneumatic output pressure to position a control valve. Unlike digital positioners, this analog unit is valued for its rapid response time and ease of manual calibration without the need for complex software.

Technical Parameters

Product Advantages

• Independent Adjustment: Features independent “Zero” and “Span” adjustments, making site commissioning straightforward and fast.
• Modular Versatility: The SRI986 design allows for the easy addition of integrated limit switches or position transmitters (4-20mA feedback) as plug-in options.
• Fast Response: The analog force-balance mechanism provides near-instantaneous response to signal changes, which is critical for high-speed control loops.
• Environmental Durability: The epoxy-coated aluminum housing and internal stainless steel components allow the unit to withstand harsh industrial atmospheres and salt spray.

Important Considerations & Precautions

• Air Supply Quality: To prevent the internal nozzle-flapper from clogging, the supply air must be filtered, dry, and oil-free according to ISO 8573-1 standards.
• Vibration: While designed for industrial use, extreme mechanical vibration can cause wear on the internal linkage. In high-vibration areas, ensure the mounting bracket is rigid and properly dampened.
• Split-Range: This model can be configured for split-range operation (e.g., 4-12 mA or 12-20 mA), but this requires mechanical adjustment of the internal spring and cam.
• Mounting Orientation: The unit can be mounted on linear or rotary actuators, but ensure the feedback lever is correctly aligned to avoid “dead zones” in the valve stroke.

Product Applications

The SRI986-BIDS7ZZZNA is a “workhorse” in heavy industries:

• Oil & Gas: Controlling flow and pressure valves in refineries and upstream production sites.
• Chemical Processing: Managing precise dosing valves in reactors and mixing tanks.
• Power Generation: Regulating feedwater and steam valves in boiler control systems.
• Pulp & Paper: Controlling the flow of various chemicals and steam used in the pulping process.

Payment: Bank of Chicago, Bank of Singapore

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