Abstract: A resonant sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid and to generate an electric field between the free-standing electrodes. A controller measures an impedance response of the sensor to the fluid between the electrodes to determine an aging effect of the sensor.

Abstract: A cooling system includes a coolant tank, a coolant sensor assembly, and a controller. The coolant sensor assembly includes a sensor package having a first end and a second end, the sensor package including a partially transparent or semi-transparent sight glass housing a coolant level sensor and configured to receive a flow of coolant therethrough. The coolant sensor assembly also includes a first valve coupled between the first end of the sensor package and a coolant tank, a second valve coupled between the second end of the sensor package and the coolant tank, and a third valve coupled in flow communication with the second end of the sensor package. The controller is configured to execute one more diagnostic self-tests for the coolant sensor assembly and the cooling system.

Abstract: A resonant sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid and to generate an electric field between the free-standing electrodes. A controller measures an impedance response of the sensor to the fluid between the electrodes to determine an aging effect of the sensor.

Abstract: A resonant sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid and to generate an electric field between the free-standing electrodes. A controller measures an impedance response of the sensor to the fluid between the electrodes to determine an aging effect of the sensor.

Abstract: A resonant sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid and to generate an electric field between the free-standing electrodes. A controller measures an impedance response of the sensor to the fluid between the electrodes to determine an aging effect of the sensor.

Abstract: A method for repairing damage to a fuel pump assembly of a locomotive is provided that includes identifying a void within a fluid cavity of a fuel pump assembly. After identifying the void within the fluid cavity of the fuel pump assembly, the void is cleaned with a cleaning product, and a filler material is inserted within the void. Then the filler material is laser welded to repair the void. After being laser welded, the fluid cavity of the fuel pump assembly is honed.

Abstract: A locomotive system is provided that includes a platform, plural wheel-axle sets operably coupled to the platform, a reservoir attached to the platform and configured to hold a fluid, and a resonant sensor probe assembly coupled to the reservoir. The sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid, to generate an electric field between the free-standing electrodes, and to measure an impedance response of the sensor to the fluid between the electrodes.

Abstract: A method for repairing damage to a fuel pump assembly of a locomotive is provided that includes identifying a void within a fluid cavity of a fuel pump assembly. After identifying the void within the fluid cavity of the fuel pump assembly, the void is cleaned with a cleaning product, and a filler material is inserted within the void. Then the filler material is laser welded to repair the void. After being laser welded, the fluid cavity of the fuel pump assembly is honed.

Abstract: A locomotive system is provided that includes a platform, plural wheel-axle sets operably coupled to the platform, a reservoir attached to the platform and configured to hold a fluid, and a resonant sensor probe assembly coupled to the reservoir. The sensor probe assembly includes a substrate formed from one or more dielectric materials and free-standing electrodes coupled with the substrate. The free-standing electrodes are configured to be placed into the fluid, to generate an electric field between the free-standing electrodes, and to measure an impedance response of the sensor to the fluid between the electrodes.