Compact Designed Air Gap Sensors are used as capacitive probes that are used for monitoring air gap between rotor poles and stator of hydro generators to identify any change in rotor poles during the operation of the machine. These Air Gap Sensors are offered in a sturdy construction that ensures optimum performance for longer period of time. These Air Gap Sensors have an integral tri axial cable of 2 meters that is terminated by a small diameter tri axial connector. Compact Designed Air Gap Sensors can be designed as per the number of poles and the size of the generators.