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w � <br /> pH #1 adjust. tank: When the pH ranges from 0 to 4 in the <br /> pH #1 adjustment tank,the pH probe #1 <br /> will send a signal to the pH monitor <br /> #1; The pH monitor #1 will energize a- <br /> way air solenoid valve #1 to close the <br /> air and open the caustic feeding valve <br /> to feed. <br /> pH #2 adjust. tank: When the pH ranges from 0 to 6 in the <br /> pH #2 adjustment tank, the pH probe #2 <br /> will send a signal to the pH monitor <br /> #2 ; The pH monitor #2 will energize 3- <br /> way air solenoid valve #2 to close the <br /> air and open the caustic feeding valve <br /> to feed. <br /> pH #3 adjust. tank: When the pH ranges from 0 to 6. 5 in the <br /> pH #3 adjustment tank, the pH probe #3 <br /> will send a signal to the pH monitor <br /> #3 ; The pH monitor #3 will energize 3- <br /> way air solenoid valve #3 to close the <br /> air and open the caustic feeding valve <br /> to feed. <br /> Low level alarm: When caustic in 500 gallon poly tank <br /> reaches a low level,the Kari float <br /> switch inside the tank energizes the <br /> alarm to warn the operator that the <br /> caustic tank needs to be refilled. <br />