7. Liquid level sensors and detectors

The most commonly used detection principles are as follows:

• float or plunger sensors (figure 21 );

• conductivity sensors (figure 22 ); for this measurement method, the liquid must be conductive;

• measurement by weighing (figure 23 );

• ultrasonic sensors (figure 24 ): an ultrasonic wave coming from an ultrasonic transmitter – receiver is reflected...