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Standard Operating Procedure: <br /> Cleaning and Calibration of PH Probes <br /> Document number: Rev. Leve date: Author/Approver Page 3 <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: (continued) <br /> Flne Offset On the circular chart, record the value as <br /> displayed on the meter. <br /> (See Image 5) <br /> 9. Adjust the FINE OFFSET control until the <br /> display indicates the value of 7.0 <br /> 10. Record the value you adjusted to (7.0) on the <br /> T" circular chart <br /> -�a7 11 <br /> Rinse probe in distilled water <br /> a <br /> 12. Place the probe in the Tupperware container <br /> with the PH Buffer 4. Allow sensor to attain <br /> temperature equilibrium in the buffer until the <br /> L. reading on the meter in the cabinet stabilizes. <br /> Image 5 <br /> 13. On the circular chart, record the value as <br /> displayed on the meter. <br /> 14. Adjust the FINE OFFSET control until the <br /> display indicates the value of 4.0 <br /> 15. Record the value you adjusted to (4.0) <br /> ri I ri pH 16. Rinse probe in distilled water <br /> U I U 17. Place the probe in the Tupperware container <br /> with the PH Buffer 10. Allow sensor to attain <br /> :. _. ��� temperature equilibrium in the buffer until the <br /> reading on the meter in the cabinet stabilizes. <br /> _ 18. On the circular chart, record the value as <br /> displayed on the meter. Do not make any <br /> adjustments to the meter while using the <br /> PH Buffer 10. This operational step serves <br /> a only as a double check and is not intended <br /> Image 6 for adjustments. <br /> 19. Dump the contents of all 3 Tupperware <br /> containers into the P7 pit. Do not reuse the <br /> buffer as contamination may occur. <br /> (Continued on next page) <br />