This type of ultrasonic sensor for measuring water level has great advantages in terms of user experience. First of all, it guarantees accuracy and repeatability, regardless materials properties or liquid properties that may affect measurement. Also, it has no moving parts which means reduced maintenance and less risk of mechanical malfunctions. Thirdly, the non-contact aspect of this measurement results in no contamination from neither it nor any compensatory effect by a liquid (either aggressive or i.e. ultra-pure) being measured Finally, installation is straightforward and can be accommodated within current systems leading to saved time and cost.