Capacitive Air Gap Sensors measure the distance between the rotor and stator in hydroelectric generators to avoid reduced efficiency or damage caused by off-center or out-of-round conditions.

 Online monitoring of the air gap with Iris Power Capacitive Gap Sensors (CGS) can provide important information about the generator condition by measuring the distance between the rotor and the stator winding.  Monitoring allows air gap issues to be identified and corrected before an in service failure can occur.