Wireless system and method for measuring an operative condition of a machine

A method comprising:

• receiving a measurement of a liquid in a reservoir of a machine having moving parts, the measurement representative of a quality of the liquid in the reservoir and obtained from a sensor disposed within the reservoir;
• wirelessly receiving an interrogation signal from a remote reader;
• generating, using electric energy of the interrogation signal, a data signal representative of the measurement of the liquid obtained by the sensor based on a response;
• and
• wirelessly communicating, using the electric energy of the interrogation signal, the data signal to the remote reader via a transponder.

A system comprising:

• a sensor sized to be within a reservoir of a machine having moving parts that are lubricated by a liquid in the reservoir, the sensor configured to obtain a measurement of the liquid that is representative of a quality of the liquid in the reservoir;
• and
• a device body operably coupled to the sensor, the device body including a processing unit and a transponder, the processing unit configured to communicate a query to the sensor requesting the sensor to obtain the measurement of the liquid responsive to receiving an interrogation signal from a remote reader, the remote reader located outside of the machine;
• the processing unit further configured to generate a data signal representative of the measurement of the liquid obtained by the sensor, the transponder configured to wirelessly communicate the data signal to the remote reader.