Sensor for determining a liquid level for an aircraft tank, assembly of a tank and a sensor, method of using such a sensor

An assembly of an aircraft tank and a sensor for determining a liquid level for an aircraft tank, the sensor comprising:

• a closure device, mounted in a port of the tank allowing liquid to circulate, and a measuring device, removably mounted on the closure device,
• the closure device comprising a liquid line configured to conduct liquid from the port of the tank and a member for automatically sealing the liquid line if the measuring device is not mounted on the closure device,
• the measuring device comprising at least one pressure measuring member configured to measure a pressure difference between, on the one hand, a liquid pressure in the liquid line and, on the other hand, a reference pressure so as to deduce therefrom the liquid level in the tank, and
• the tank comprising a mouthpiece formed around the port, the mouthpiece comprising at least one opening, in fluidic communication with a gas phase of the tank via a first internal gas line portion formed in a thickness of a wall of the tank, the closure device comprising a second internal gas line portion configured to supply the measuring member with the gas pressure as reference pressure.