I/P Transducers - How They Work and What You Need to Know

I/P Transducer
ControlAir

Converting from one signal type to another is a common challenge in process control. When the application calls for conversion from an electrical signal, current or voltage, to a pneumatic signal (pressure), this calls for an I/P transducer.

The I/P transducer is an electro pneumatic device that converts current or voltage input signal to a linearly proportional output pressure. These transducers are available in a wide array of configurations to accommodate almost any industrial setting or application.

The  I/P transducer pictured is a force balance device. A coil is suspended in a magnetic field by a flexure. As the input signal current flows through the coil, the resulting magnetic force causes axial movement of the coil and flexure. The flexure movement toward a nozzle creates back pressure which acts as a pilot pressure to an integral booster relay. Input signal changes produce proportional output pressure changes. A diagram in the white paper provided below provides accompanying detail.

Applying the I/P transducer is a straight forward operation, involving matching the device input and output signal capabilities with those of the application. The white paper included below provides further detail on how these devices operate and how to properly apply them. Also, included are recommendations for mounting, calibrating, and a host of other useful information items.

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Ins and Outs of I/P Transducers from Hile Controls of Alabama, Inc.