SRI990-BIMS7EAA-R FOXBORO

SRI990-BIMS7EAA-R Foxboro Processor module

Brand：Foxboro Model number：SRI990-BIMS7EAA-R

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

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Product Details：

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The SRI990-BIMS7EAA-R is an electro-pneumatic positioner that converts a $4-20 \text{ mA}$ DC input signal into a proportional pneumatic output pressure. This pressure moves the valve actuator to a precise position. The unit is designed for universal application, meaning it can be mounted on both linear actuators (for globe valves) and rotary actuators (for butterfly or ball valves). The mechanical construction is highly durable, featuring a heavy-duty housing that protects internal pneumatic components from corrosive industrial atmospheres. The "R" suffix typically denotes a specific orientation or a revision for right-hand mounting or increased vibration resistance.

Product Parameters

Input Signal: $4-20 \text{ mA}$ DC (Standard two-wire loop).
Pneumatic Output: $0$ to $100\%$ of supply pressure, typically up to $6 \text{ bar}$ ( $90 \text{ psi}$ ).
Supply Air Pressure: $1.4$ to $6 \text{ bar}$ ( $20$ to $90 \text{ psig}$ ); air must be dry, oil-free, and filtered.
Characteristic: Linear or equal percentage (adjustable via internal cam or linkage setup).
Ambient Temperature: Standard range from $-40\text{°C}$ to $80\text{°C}$ ( $-40\text{°F}$ to $176\text{°F}$ ).
Protection Class: IP65 or NEMA 4X, providing excellent resistance to water and dust ingress.
Air Consumption: Low steady-state air consumption to minimize energy costs in large plants.
Inlet/Outlet Connections: $1/4$ NPT for air and $1/2$ NPT or M20 for electrical conduit.

Product Advantages

A major advantage of the SRI990-BIMS7EAA-R is its Simplified Analog Operation. Because it does not rely on complex digital software for basic positioning, it is much easier to commission and maintain for technicians who prefer traditional calibration methods. The Fast Dynamic Response ensures that the valve reacts almost instantaneously to changes in the control loop, which is vital for maintaining process stability.

The Universal Mounting Kit allows this single model to be standardized across a plant, reducing the need to stock multiple different positioner types for different valves. Furthermore, the Rugged Modular Design allows for easy replacement of the pneumatic relay or the electronic module without removing the entire unit from the valve, significantly lowering long-term maintenance costs.

Important Considerations and Precautions

When installing the SRI990-BIMS7EAA-R, the Quality of Instrument Air is the most critical factor. The air supply must be filtered to at least $5 \text{ microns}$ and be free of moisture; contaminated air will quickly clog the internal nozzles and restrictors, leading to sluggish performance or total failure. Linkage Alignment is also essential; if the feedback lever is not perfectly centered and aligned with the valve stem, the positioner will experience "hunting" or excessive wear on the internal bearings.

Technicians must ensure that the Supply Pressure does not exceed the maximum rating of the actuator, even if the positioner can handle it. Over-pressurizing can rupture actuator diaphragms. Finally, when used in Hazardous Areas, ensure that the electrical conduit is sealed with an approved pour-seal or gland to maintain the explosion-proof or intrinsically safe integrity of the housing.

Product Applications

The Foxboro SRI990-BIMS7EAA-R is utilized in various process industries where reliable valve control is mandatory.

Oil and Gas Production: Controlling the flow of crude oil and gas in separators and wellhead manifolds.
Chemical Processing: Managing the precise injection of reagents into reactors where consistent flow rates are required for product quality.
Pulp and Paper: Controlling steam valves and liquid additives in the bleaching and drying sections of the paper machine.
Power Generation: Regulating feed water valves and cooling water flow in thermal power plants.
Water Treatment: Managing large-scale butterfly valves for filtration and chemical dosing in municipal water facilities.

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