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s�me, avN ed�asl» „I <br /> (CuaMG �W,%' ouw.r qbt Vo/V/f <br /> Ta»M M,es/ Z"o <br /> 7**pH odJ usfm�»r <br /> /or lc onr <br /> s,,& w,d Yer1VK <br /> flay;l r0%Itr%.yulplcs/ <br /> SnMn��d lblr/J I li nWIrr <br /> t <br /> FIGURE 3-5 CAUSTIC FEED OPERATION <br /> 3 . 3 CAUSTIC FEED The 2-way solenoid valves are energized <br /> OPERATION by Kari float switch signals from <br /> equalization tank B. The supply air <br /> flows through the two way solenoid <br /> valves and filter/regulator/lubricator <br /> to operate the air diagram Wilden pump. <br /> If no caustic feeding demand, the air <br /> diagram Wilden pump must operate to <br /> circulate the caustics. _ <br /> -If 2 - 4 pH range in adjustment tank 1 , <br /> pH probe #1 will send a signal to pH <br /> monitor #1 ; the pH monitor will <br /> energize the 3-way solenoid valve #1 to <br /> close the air and open the pink valve <br /> (caustic valve) . <br /> -If 2 to 6 . 5 pH range in pH adjustment <br /> tank 2 , the pH probe #2 sends a signal <br /> to pH monitor #2 , the pH monitor <br /> energizes the 3-way solenoid valve #2 to <br /> close the air and open, the pink valve #2 <br /> which feeds caustic. <br />