CHEMICAL MIX AND DELIVERY SYSTEMS AND METHODS THEREOF

摘要

Chemical delivery systems and methods for delivery of liquid chemicals are disclosed. In on embodiment, systems having multi-reservoir load cell assemblies (Figs. 2, 4, 5, 7, 9, 11) for delivering chemicals used in the semiconductor industry are disclosed. In another embodiment (Fig. 12), the present invention provides a multi reservoir load cell assembly (69, 92, 71), including a controller (PLC), a buffer reservoir (92, 71), a main reservoir (69), one or more load cells (12, 13, 67, 68, 91, 96) coupled to the assembly and to the controller, operable to weigh the liquid in the reservoirs, a plurality of supply lines (A-D), each supply reservoir, and a gas and vacuum sources for withdrawing the liquid from the assembly when demanded by the controller and for refilling the assembly from the supply containers. A proportional valve block including a buffer control Intel (80) and outlet (81) valves adjust the pressure to the buffer reservoirs.