Proximity sensor
Vibro-Meter

The Vibro-Meter UK 0100KPX and 0200KPX were developed as replacements for microswitch-based position and proximity sensors to detect the door lock actuator position for the Hurel-Hispano thrust reverser on the A318/PW6000. Both sensors utilize an air-gapped transformer to produce an electrical output as a ratio of excitation voltage. The 0100KPX sensor produces an output dependent on axial or lateral position of a ferromagnetic target attached to the moving element of the system. The 0200KPX produces an output dependent on the position of a ferromagnetic core attached internally to the sensor plunger, which is in contact with the door lock actuator. Both sensors interface with the FADEC controller to provide multi-level sensing. By eliminating electrical switch contacts, reliability is greatly increased. This technology can be used on other applications, such as airframes and closures, where confirmation or position is required.

Vibro-Meter is developing other sensors using similar technology, which can be influenced by non-ferromagnetic targets such as stainless steel and aluminum.