Patent ID: 7515994
Filing Date: 2009-04-07
Classification: G05D

Abstract:
1. An accurate blending module for blending a supply of feed solution and a supply of adjusting solution comprising: a) a feed inlet adapted to communicate with the supply of feed solution; b) an adjusting solution inlet adapted to communicate with the supply of adjusting solution; c) a feed pump in communication with the feed inlet; d) an adjusting pump in communication with the adjusting solution inlet; e) a continuous recirculation loop featuring a recirculation pump and a sensor, said recirculation loop in communication with said feed pump and said adjusting pump so that feed solution and adjusting solution are received by the recirculation loop and mixed therein by the recirculation pump; and f) a controller in communication with the sensor so that a characteristic of the feed solution in the recirculation loop can be detected, said controller also in communication with the adjusting pump so that delivery of adjusting solution to the solution in the recirculation loop can be controlled based upon the detected characteristic.