SRI986/SRI986-BIDS7ZZZNA FOXBORO

SRI986/SRI986-BIDS7ZZZNA Foxboro Processor module

Brand：Foxboro Model number：SRI986/SRI986-BIDS7ZZZNA

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

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Product Details：

Product Dimensions：

The SRI986 is an established, highly reliable electro-pneumatic positioner used throughout the process industries. The unit works on the force-balance principle, balancing the magnetic force generated by the input current against the mechanical force of a feedback spring connected to the valve stem. The variant code SRI986-BIDS7ZZZNA designates a specific combination of options, including its entry threads, housing material, explosion protection certification, and mounting kits. It features independent adjustment loops for both zero and span, allowing technicians to calibrate the valve stroke dynamically. The rugged aluminum or stainless steel housing is built to endure ambient vibrations and corrosive atmospheres typical of chemical and oil processing plants.

Product Parameters

Input Signal Range: Standard $4$ to $20 \text{ mA}$ DC analog signal.
Input Resistance: Typically around $200 \text{ Ohms}$ to $250 \text{ Ohms}$ at $20\text{°C}$ , minimizing the load loop voltage drop.
Supply Air Pressure: Minimum $1.4 \text{ bar}$ ( $20 \text{ psi}$ ) up to a maximum of $6 \text{ bar}$ ( $90 \text{ psi}$ ), depending on actuator requirements.
Output Pressure Range: $0$ to $100\%$ of the supply air pressure delivered directly to the actuator diaphragm or piston.
Stroke Range: Accommodates linear strokes from $8 \text{ mm}$ up to $100 \text{ mm}$ ( $0.3 \text{ inches}$ to $4 \text{ inches}$ ), or rotary angles up to $90\text{°}$ .
Air Consumption: Low steady-state air consumption, typically less than $200 \text{ l/h}$ at a supply pressure of $1.4 \text{ bar}$ .
Ambient Temperature Range: Standard operation from $-40\text{°C}$ to $80\text{°C}$ ( $-40\text{°F}$ to $176\text{°F}$ ).
Explosion Protection: Certified under ATEX, FM, or CSA standards for intrinsic safety or explosion-proof housings depending on the precise suffix configuration.

Product Advantages

A major advantage of the Foxboro SRI986 is its Proven Mechanical Reliability. Because it utilizes analog components rather than complex digital microprocessors, it is highly resilient against electrical surges and high ambient temperatures that might cause digital positioners to fault. The Fast Dynamic Response ensures that changes in the control loop signal are translated almost instantly into valve movement, which is critical for maintaining tight process parameters.

The Simple Calibration Procedure uses accessible mechanical adjustment screws for zero and span, meaning field technicians can commission or adjust the positioner quickly with basic hand tools. Additionally, its Low Air Consumption design significantly lowers the operational costs associated with compressing instrument air across a large-scale plant facility.

Important Considerations and Precautions

When installing and maintaining the SRI986-BIDS7ZZZNA, the Instrument Air Quality is of paramount importance. The supply air must be dry, clean, and oil-free, conforming to ISA standard S7.0.01; moisture or particulate contamination can plug the internal pneumatic amplifier or restrictions, leading to sluggish control or complete valve seizure.

During the Mechanical Linkage Alignment, ensure that the feedback lever is perpendicular to the valve stem at $50\%$ stroke to minimize linearity errors. Because the unit relies on physical balance springs, Severe Piping Vibrations can cause premature wear on the internal bearings and linkages; in high-vibration zones, a remote mounting configuration should be considered. Lastly, always ensure the Housing Cover is Securely Tightened and cable entries are sealed with proper glands to maintain the unit’s environmental IP rating and prevent moisture ingress from causing corrosion on the internal torque motor.

Product Applications

The Foxboro SRI986-BIDS7ZZZNA is widely used to automate control valves across major industrial process operations.

Oil and Gas Refining: Positioners installed on linear globe valves regulating crude oil flow, fuel gas lines, and distillation column feeds.
Chemical Processing: Controlling highly corrosive or toxic fluid flows where analog reliability and safety-rated explosion-proof housings are mandatory.
Power Generation: Regulating cooling water loops, low-pressure steam valves, and auxiliary boiler water feeds.
Pulp and Paper Mills: Managing stock flow lines and chemical additives where ambient humidity and vibration levels are high.
Water and Wastewater: Operating rotary butterfly or ball valves in filtration systems and chemical dosing loops.

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