The sensors from Holthausen are used in the Zeppelin NT as level switches in the three fuel tanks.
Installed in the upper area of the tanks, they report that the tank is full and thus also serve as an overfill protection.
Installed at the bottom of the tanks, they report that the tank is almost empty and also serve as dry-running protection of transfer pumps.
For the use in the Zeppelin, the standard level control sensors were modified by Holthausen and tested and approved by ZLT-Zeppelin Luftschifftechnik.
Since the beginning of 2014, the sensors have been used to the fullest satisfaction in several airships.