Level Switches are Sensors with an electrical contact output at a specific liquid, powder or bulk level. In addition, capacitive, conductive, diaphragm, displacer, float, inductive, optical, paddle, vibrating rod, tilt, and tuning fork models are the different types of level switches available.
The Tuning Fork Level Switch is an ideal choice for level control of powders. The Level Switch incorporates a piezoelectric crystal that vibrates the fork at its natural frequency. Also, when the fork comes in contact with a material, the vibration is dampened and the switch changes state. Finally, as the fork becomes free of material, the switch changes back to its normal state.
SRS float level controls use a simple float and magnetic coupling action. As the float rises or falls with liquid level, it moves a magnetic sleeve into or out of the field of a switch actuating magnet, causing switch operation. Furthermore, a non-magnetic barrier tube effectively isolates the switch mechanisms from the controlled liquid.
Measurement is based on change of capacitance. Also, Capacitive Sensors are an insulated electrode acts as one plate of capacitor and the tank wall (or reference electrode in a non-metallic vessel) acts as the other plate. The capacitive level sensor depends on the fluid level and the conductivity of the fluid.