Construction of Fuel and Oil Quantity Sensors for High-Performance Aircraft

This paper describes the materials and methods of construction of fuel and oil quantity sensors designed to be used in the severe environments of todays high-performance aircraft. The sensors are based on the use of magnetically activated reed switches suitably compensated by resistors. In order to provide physical and electrical protection, the switches and resistors are encapsulated in a fuel and oil resistant electrical insulation formed of alternate layers of polyimide film and compatible fluorocarbon polymers.