Mobrey Squitch
Ultrasonic Point Level Switch
This switch has no moving parts, and operated by transmitting an ultrasonic beam from one side of the switch to the other. When the switch is immersed, the ultrasonc beam is carried through the fluid, and is detected by the other side., however when the level drops and the switch becomes dry, the ultrasonic beam can no longer travel from one fork to the other, and the switch is activated.
These switches are good for fluids that have entrained solids that could jam up a mechanical switch, they are also good for sanitary applications as they can be supplied with a 3A finish.