This ULT 22 series instruments are blind transmitters. An ultrasonicwave is pulsed 5 times a second. The reflection of this pulse is received by the sensor. 

The time taken for the wave to travel to the object and back to the sensor is proportional to the distance of the object from the sensor. The compact size, narrow beam angle and smalldead band ensures that these sensors will work.

Reliably for small tanks. These sensors are aggressively priced and are comparable to mechanical level switches for the same tank size.

These non-contact instruments find a variety of applications. Typical applications are measuring level of liquids in small storagetanks and diesel tanks. Other applications include conveyor line counting, web loop tension measurement, open channel flow measurement, collision detection, and more.

Its advantages include: non-contact level measurement; 2.2m measurement range; 4-20ma output (3 wire type);  10 deg beam angle; 11 deg beam angle; compact size; easy to mount; can be mounted in diesel tanks; field programmable output.