Displacer actuated level controls for boiler feed systems is a displacer actuated level controls that provide output signals in direct proportion to changes in liquid level. As the buoyancy force on a displacer changes with liquid level movement, a range spring supporting the displacer extends or compresses, moving a magnetic ball. A magnet carriage within the controller head follows the ball producing a change in output. It is applicable in feed water and steam drum applications.