A fluid sensor/plant machinery monitoring system and method wherein a plurality of on-line fluid property sensors output on-line sensor data and are connected to an interface configured with a server outputting the on-line sensor data via a network. A remote information management system requests and receives the on-line sensor data via the network, stores machine fluid property laboratory data, and calculates an estimate of one or more fluid properties based on both the received on-line sensor data and the stored laboratory data. A manifold unit receives fluid from a machine and includes ports for the on-line fluid property sensors. The remote information management system calculates one or more fluid properties based on both the received on-line sensor data and the stored laboratory data based on models where a machine fluid property is a function of both the on-line sensor data and the stored laboratory data for the machine.
