Foxboro AD202MR Pneumatic Proportional Controller

Overview

The Foxboro AD202MR is a pneumatic control module designed for proportional regulation within Foxboro I/A Series distributed control systems. It is ideal for environments where pneumatic operation is preferred over electrical signals, including hazardous locations, explosion-risk areas, or remote sites without reliable power.

Operating Principle

The AD202MR employs a force-balance mechanism to provide precise and stable control. It receives a standard pneumatic input signal and generates a proportional output to drive valves or other pneumatic actuators. The design ensures consistent loop performance while eliminating the need for electrical power.

Technical Specifications

Key Characteristics

Fully pneumatic operation removes the need for electrical wiring
Force-balance mechanism ensures stable and accurate control
Wide proportional band allows flexible loop tuning
Seamless integration with Foxboro I/A Series systems
Durable housing withstands harsh industrial environments
Reliable operation in extreme temperature and humidity conditions

Application Scope

The AD202MR is commonly used in:

Hydrocarbon production and refining
Chemical processing and pharmaceutical plants
Thermal and conventional power plants
Water and wastewater treatment facilities
Remote field stations and offshore platforms

FAQ

Q: Does the AD202MR require electrical wiring?
A: No. It operates entirely on pneumatic input and compressed air supply.

Q: Can it integrate with modern DCS systems?
A: Yes. It interfaces directly with Foxboro I/A Series racks and hybrid control loops.

Q: What control action does it support?
A: Proportional control is standard, with optional integral action for enhanced loop stability.