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0 0 <br /> 8 Maintaining your pH Control <br /> 1 Probe Test <br /> Your pH Control is equipped with a probe which reads the pH of the effluent in the reaction <br /> tank. To test the efficiency of the probe, you must occasionally perform a "PH Probe Test". <br /> • Press and hold the "#" key for 5 seconds to enter the Scripting Level. <br /> The message on the display will be: <br /> • Press the "#" key 8 times. <br /> The message on the display will be: <br /> • When selecting "Y" all other functions are off. This will provide a current pH reading of <br /> the solution in the cup the probe is submerged. The probe can be removed from the <br /> Neutralizer tank and put in buffer solution to verify the calibration of the pH probe. <br /> Once the reading has stabilized, press the "#" key to advance. <br /> • The message on the display will be: <br /> • If the pH is below 6.6 or above 7.4 press the "up arrow" key to calibrate the probe. <br /> 2 Cleaning the Spill Sensor <br /> To keep the spill sensors working effectively, you must keep the surface of the sensors clean <br /> at all times. <br /> •®Udry cloth to wipe away any dust or residue that has accumulated on the sur- <br /> face of the spill sensor connected to the containment tray and the puck near the drain. <br /> You should also take this opportunity to wipe away any other dust or residue that has <br /> accumulated on the pH Control. <br /> 3 Replace Inlet Filter <br /> All three inlet filters must be cleaned or replaced every 60 days. <br /> Press the I/O key to turn off the pH Control. <br /> • On the back of the pH Control, disconnect the tubing from the "Developer Inlet from <br /> Tank", Water Inlet from Tank" and "Neutralizer Inlet from Tank". Clean or replace the <br /> yellow inlet filter. <br /> • Turn the pH Control ON. <br /> Metaf`ix pH Control Manual Page 15 <br />