Fluid level switches for pumps
Float level switch
The structure of floating ball liquid level switch is mainly designed and produced based on the principle of buoyancy and static magnetic field. The position of the floating ball with magnet in the measured medium is affected by buoyancy: the change of liquid level leads to the change of magnetic float position. The magnet in the floating ball and the sensor (magnetic spring switch) act to generate the switch signal.
Tuning fork level switch
The working principle of tuning fork level switch is to make the tuning fork vibrate at a certain resonance frequency through a pair of piezoelectric crystals installed on the base. When the tuning fork of the tuning fork liquid level switch contacts with the measured medium, the frequency and amplitude of the tuning fork will change. These changes of the tuning fork liquid level switch are detected by the intelligent circuit, processed and converted into a switch signal to achieve the purpose of liquid level alarm or control. In order to extend the tuning fork into the tank, the flange or threaded process connector is usually used to install the tuning fork switch to the side or top of the tank body.
Capacitive level switch
The measuring principle of capacitive liquid level switch is that the change of the level of solid material results in the change of the size of the covered area of the probe, which results in the change of the capacitance value. The probe and the tank wall (made of conductive material) form a capacitance. When the probe is in the air, the initial capacitance of a small value is measured. When there is material injected into the tank, the capacitance will increase with the increase of the area covered by the material, and the switch state will change.