What is a diaphragm level switch?

Basically a diaphragm level switch has a diaphragm inside the module that moves up and down depending on the applied media pressure. If the level rises, the diaphragm will move upward through the medium and lower the pressure below the face, changing the electrical output. If the level is falling, the diaphragm will move downward through the medium and change the electrical output, increasing the pressure below the face. This shows that pressure is the actuating force for this switch.