from factory integrated ultrasonic level meter ultrasonic instrument ultrasonic water level gauge level transducer

there are two main installation methods for ultrasonic level gauges. one is mounting and the other is bottom mounting. the ultrasonic level gauge is also used for liquid guiding. the ultrasonic probe is installed outside the bottom of the tank, and the ultrasonic wave is introduced from the bottom. the liquid is measured to propagate to the liquid surface and reflected back to the probe. the propagation time is proportional to the level of the liquid level.