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Standard Operating Procedure: Cleaning and Calibration of PH Probes Document number: Rev. Leve date: Author/Approver Page 4 "11/09/05 SOP 2003-0001 A Wayne Mannor-/- Bill Palmer PROCEDURE: CLEANING AND CALIBRATION OF CITY PH 20. Place the probe back in the pit PROBE: (continued) 21. Return all supplies to the supply cabinet. Note: This test will be performed daily at the A or B or C shift pickling operators scheduled start time. PROCEDURE: CLEANING AND CALIBRATION OF THE PH 1. Turn the Chemical Pumps to Off position and PROBES IN TANKS 1 & 2: turn off P-7 Pump switch. 2. Fill Tupperware container with pH Buffer 7. 3. Remove the pH probes from # 1 & 2 balance tanks. 4. Clean the probes with distilled water and an The Pickling /Waste Treatment Operator will acid brush to remove any impurities. Ensure perform the following: the bulb is clear and clean and does not have a film over it. 5. Rinse the probes again to flush them with (Note: There is one (1) probe in # 1 tank and distilled water. two (2) probes in # 2 tank that needs to be cleaned and calibrated during the same 6. Place the probe in the Tupperware container session weekly) with the pH Buffer 7. Allow sensor to attain temperature equilibrium in the buffer until the reading on the meter in the cabinet stabilizes. 7. Review the value on the meter in the cabinet. If the value displayed is within 6.9 to 7.1, place the probe back in the tank. If the value is outside of the upper or lower limit, make the proper adjustment and/or call the Maintenance Supervisor if necessary immediately. 8. After cleaning and calibration, Turn to On or Auto position, the Chemical Pumps and P-7 Pump. NOTE: This test will be performed weekly, on Mondays, by the assigned Shift Pickling Operator at the start of the Shift