Swivel blocking material steric float switch overview spin material level switch is the motor which drives blades to rotate. When the measured medium rise to leaf position, leaf by dielectric barrier to stop rotating, thus through the relevant control mechanism output open (pass) or off (off) the contact signal response measured the position of float switch medium high, and cut off electrical power to the motor to stop rotating; when the medium decreased away from the blade, under the action of the spring leaves in situ recovery continues to rotate to detect float switch changes in the location of the medium.