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Standard Operating Procedure: <br /> Cleaning and Calibration of PH Probes <br /> Document number: Rev. Leve date: Author/Approver Page 2 <br /> "11/09/05 <br /> SOP 2003-0001 A Wayne Mannor-/- Bill Palmer <br /> PROCEDURE: <br /> CLEANING AND CALIBRATION OF CITY PH The Pickling/Waste Treatment Operator will: <br /> PROBE: <br /> 4. Fill one of the 3 Tupperware containers with <br /> PH Buffer 4, one with PH Buffer 7 and one <br /> with PH Buffer 10. <br /> 5. Clean the probe with distilled water and an <br /> acid brush to remove any impurities. Ensure <br /> the bulb is clear and does not have a film over <br /> F' it. <br /> 6. Rinse probe in distilled water (See Image 3) <br /> s 7. Place the probe in the Tupperware container <br /> MO <br /> with the PH Buffer 7. Allow sensor to attain <br /> L._ - _,,__ temperature equilibrium in the buffer until the <br /> Image 3 reading on the meter in the cabinet stabilizes. <br /> (See Image 4) <br /> t-. <br /> Image 4 <br /> (Continued on next page) <br />