Product Details:

SIEMENS 771-3STF2 is a precision I/P transducer (current-to-pressure converter) from the classic 771 series, designed to convert electronic control current signals into proportional pneumatic pressure output for field valve actuation. It accepts 1-5 mA DC standard analog input signal and converts it linearly into 3-15 PSIG pneumatic output pressure, acting as the critical signal bridge between electronic DCS controllers and pneumatic valve actuators, positioners and diaphragm actuators. The unit adopts rugged die-cast housing with internal precision flapper-nozzle pneumatic structure, built with vibration-resistant assembly and dustproof sealing design, capable of resisting continuous mechanical vibration, humidity and temperature fluctuation in outdoor and skid-mounted industrial sites.

It features excellent linearity and low hysteresis performance to guarantee stable proportional output under long-cycle continuous regulation. The built-in pressure stabilizing and filtering structure can suppress air supply fluctuation and small debris interference from instrument air pipelines, avoiding output pressure drift that may cause valve hunting. It supports convenient zero and span calibration on site for matching different control loop requirements. The compact body is suitable for direct mounting near control valves or local instrument manifolds, saving installation space and shortening pneumatic signal transmission distance. Every unit will go through air tightness inspection, signal linearity test and pressure output verification before shipment to ensure stable matching with original control and pneumatic equipment. It is widely stocked as replacement spare parts for aging pneumatic control loops in process plants.

Industry Applications: Applied in petrochemical auxiliary skids, gas flow control systems, boiler closed-loop control rooms and water treatment facilities for conventional analog signal acquisition and valve regulating output.

Note: Confirm SAM combined I/O feature and hardware revision before ordering

This is from our current stock.