The input current flows through the coil thereby magnetizing the soft-iron yoke. The flux lines of this system being exposed at the gap apply a force proportional to the input signal on the permanent magnet which is made from a highly coercive metal .

The small magnet together with the flapper forms the moving parts, controlling the air pressure at the nozzle, which is proportional to the magnetic force. The air flowing from the nozzle forms a restoring force balanced by the force applied to the magnet.

The nozzle is supplied with air through a throttle. And back pressure through power amplifier gives proportional output. The described units are properly matched, Hance, a linear correspondence of electric input and pneumatic output signals is achieved.

The direction of action of the converter is determined by the coil polarization.

Zero adjustment is made by twisting the tensioning band, on which the flapper is mounted.

Range adjustment is performed using the potentiometer connected with a resistor in parallel to the coil.

Mounting
The Flucon 600 FC series transducers can be pipe, panel or bracket mounted in any position. Position other than vertical will require recalibration of the zero