Abstract: An intelligent ball sensor assembly for use with a heat exchanger system, includes a mechanically compliant ball having a recess formed therein. At least one sensor positioned on the ball is configured to gather selected information regarding a heat exchanger system. Signal conditioning control/transmission circuitry is operatively connected to the at least one sensor. A power source is operatively connected to the at least one sensor and the signal conditioning control/transmission circuitry. The sensor and the signal conditioning control/transmission circuitry cooperate to gather information about the status, health and efficiency of the heat exchanger system.