Level measurement is one of the most common parameters measured in process industries. Level sensors use one of several principles to detect the level of liquid in a container and convert the measurement to electrical signals or a mechanical movement for local indication. Some of the types covered in this article include visual detection, capacitance, conductivity and ultrasonic type level sensors.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/level-sensor