Liquid level sensor

A liquid level sensor comprising a rod of insulating material, a float of insulating material surrounding said rod and being displaceable along the rod first and second resistance wires, a contact element arranged on the float and electrically connected to said first and second resistance wires to provide a current circuit whose resistivity varies depending on the position of the float along the rod, said contact element comprising a first contact plate for the first resistance wire and a second contact plate for the second resistance wire, the float including stabilizing means for preventing said float from turning about the rod the resistance wires being wound helically and parallel about the rod with the first wire being recessed in the rod in the area in which the second resistance wire bears against the contact plate and the second wire being recessed in the rod in the area in which the first resistance wire bears against the contact plate.