Patent ID: 7614410

Claim:
A control system for a cleaning system including a pump for supplying a cleaning chemical to a tank for holding a cleaning mixture of the cleaning chemical and a diluting fluid, the cleaning system further including a fluid supply conduit in fluid communication with a cleaning location and the tank, the cleaning system further including a fluid return conduit in fluid communication with the cleaning location and the tank, the cleaning system further including a source of rinsing fluid in fluid communication with the cleaning location, the cleaning system further including a drain in fluid communication with the cleaning location, the control system comprising: a sensor located in the fluid supply conduit, the sensor outputting concentration signals indicative of a concentration of a component of fluid passing the sensor; and a controller having a processor and a data storage means, the processor being in communication with the sensor and the data storage means, wherein the controller is configured to executed a program stored in the controller to: record in the data storage means a data table including (i) time intervals during a period of operation of the cleaning system, and (ii) concentration values associated with each of the time intervals, the concentration values being derived by the processor from concentration signals received from the sensor.