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APRIL 2018 I PCB007 MAGAZINE 91 Figure 13: A basic automatic solution controller; in this example, an electroless copper controller for copper, hydroxide and formaldehyde concentrations. Figure 14: Schematic of an advanced chemical analyzer/controller using the four basic sensors: 1) Specific gravity; 2) Colorimeter for metal concentration; 3) pH/ORP sensor; and 4) CVS sensor.