Bellofram 221-961-070 Pressure Transducer 4-20mA Output

The Bellofram 221-961-070 Type 1000 I/P transducer converts a 4-20 mA control signal into a proportional pneumatic output of 3-15 psi, powered by a clean instrument-air supply in the 18-100 psi range. This 1/2 in NPT ported device uses Bellofram’s Type 1000 current-to-pressure architecture and is designed for industrial control applications that require a precise, repeatable 3-15 psi output in response to PLC or instrumentation signals. Input is 4-20 mA and the pneumatic output is 3-15 psi, with a supply pressure maximum of 100 psi. The unit is designed for use with instrument-quality air, and the model 221-961-070 is the 4-20 mA input variant of the Type 1000 series; it has been discontinued by the manufacturer and superseded by the 961-070-000 variant. Typical uses include automation control loops, pneumatic actuator actuation, and process control where a current loop must be converted to a stable, low-pressure pneumatic signal. Port size is 1/2" NPT for straightforward plumbing, and the 18-100 psi air supply range supports integration with standard shop air systems. This transducer is compatible with standard 4-20 mA signaling in industrial instrumentation, providing a direct path from electrical control to pneumatic actuation.