The Watson Smith Type 425 I/P Converter is a high-accuracy electro-pneumatic interface designed to translate standard 4–20 mA analog control signals into regulated pneumatic pressure. Engineered for control loops in process industries, the device provides smooth, linear output performance, enabling precise actuation of control valves, positioners, dampers, and pneumatic instrument circuits.

With a 0.2–1 bar output range and 60 PSI inlet supply, the Type 425 maintains excellent stability under varying load and supply conditions. Its rugged design ensures long operational life in chemically aggressive environments, high vibration zones, and outdoor plant installations.

Used extensively in oil & gas, chemical processing, utilities, and manufacturing sectors, this I/P converter delivers dependable feedback control performance to support consistent product quality and process efficiency.

✅ Technical Specifications

• Manufacturer: Watson Smith

• Model Type: 425

• Part Number: 53AF2132

• Input Signal: 4–20 mA DC

• Pneumatic Output: 0.2–1 bar (3–15 psi equivalent)

• Air Supply: 60 PSI (typical)

• Function: Current-to-pressure (I/P) conversion

• Mounting: Field or panel installation

• Typical Connection: Standard pneumatic fittings

🧪 Typical Applications

• Pneumatic control valve positioning

• Flow, level, and pressure control systems

• Damper and actuator control

• Analyzer sample panel regulation

• Distributed control system interfaces

• Process automation loops

💡 Benefits

• Converts electrical control signals to regulated pneumatic output

• High stability and low hysteresis

• Excellent linearity for accurate process modulation

• Durable construction for industrial duty

• Easy integration into existing DCS/PLC architectures