Foxboro SRI986SRI986-BIDS7ZZZNA Smart Valve Positioner

Description

Foxboro SRI986SRI986-BIDS7ZZZNA Smart Valve Positioner

Product Dimensions：

The Foxboro (by Schneider Electric) SRI986-BIDS7ZZZNA is an industry-proven Electro-Pneumatic Positioner. It is designed to precisely control and operate pneumatic valve actuators from control systems and electrical controllers utilizing standard analog current signals.

Product Detailed Description

The SRI986-BIDS7ZZZNA operates on a force-balance principle to ensure that the physical position of a linear or rotary valve actuator corresponds exactly to the input signal received from a PLC or DCS.

By analyzing its exact part number string SRI986-BIDS7ZZZNA, we can break down its precise hardware configuration:

• -B: Single-Acting version (designed for spring-return actuators).
• I: 4 to 20 mA analog input signal range.
• D: Direct Version (Increasing input current signal increases the pneumatic output pressure).
• S: Without built-in limit switches or position transmitters.
• 7: Cable entry equipped with an M20 x 1.5 plastic cable gland (Color: Gray).
• ZZZ: Without explosion-proof / intrinsic safety electrical certification (Standard general-purpose device).
• N: Attachment kit ordered separately as an auxiliary.
• A: Manifold ordered separately as an auxiliary.

Technical Parameters

Product Advantages

• Enhanced Force-Balance Mechanics: Offers fast response times and precise modulation, significantly reducing the adverse effects of valve stem friction, packing tightness, and high fluid differential pressures.
• Independent Adjustments: Features user-friendly, non-interactive mechanical adjustments for zero point and span, simplifying local site commissioning.
• Rugged and Reliable: Built inside a heavy-duty, corrosion-resistant housing designed to withstand harsh industrial plant environments.
• Flexible Mounting: Highly adaptable design allows it to be mounted onto both linear diaphragm actuators (stroke ranges from 8mm to 100mm) and rotary actuators via standard VDI/VDE 3845 attachment kits.

Important Considerations & Precautions

• Air Supply Quality: It is critical that the pneumatic supply air is clean, dry, and oil-free (instrument-grade air in accordance with ISO 8573-1). Dust particles or ambient moisture can clog the fine internal nozzle-flapper assembly.
• Single-Acting Limitation: As a single-acting positioner (-B), it must only be paired with spring-return actuators. It cannot control double-acting cylinders without adding an external reversing relay.
• Non-Hazardous Area Use Only: The ZZZ option means this specific device does not hold ATEX, FM, or CSA hazardous area approvals. Do not install this unit in environments where explosive gases or flammable dust mixtures may be present.
• Vibration Mitigation: Ensure that all mounting brackets and linkages are tightened securely. High-frequency pipeline vibrations can cause premature wear on the internal measuring springs and feedback levers.

Product Applications

The Foxboro SRI986 series is widely used to regulate control loops in general manufacturing and process industries:

• Chemical Processing: Precise positioning of control valves managing raw material flows.
• Water & Wastewater Treatment: Operating large butterfly and ball valves for flow and pressure regulation.
• HVAC & Utilities: Controlling steam or chilled water line valves in power utilities and plant boilers.
• Pulp & Paper: Regulating fluid consistency and additive feeds along process lines.

Payment: Bank of Chicago, Bank of Singapore

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