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_ _ _ _Envorental <br /> Insert the electrode into the BOD funnel, making sure that the electrode tip is <br /> not immersed in the water and does not have water droplets clinging to the <br /> outside of the membrane. <br /> Use this bottle for storing the electrode between measurements. <br /> 3. With the electrode mode switch in the OFF position, switch the meter to the pH <br /> mode. Set the meter's slope control to 25°C. Set the reading to 7.00 with the <br /> meter's calibration (standardization) control knob. <br /> 4. Turn the mode switch on the electrode to BT CK (battery check) position. Good <br /> battery operation is indicated by a reading of 13.40 or greater on the meter. <br /> • <br /> 5. Turn the mode switch on the electrode to the ZERO position. Use the 'ZERO <br /> calibration control knob to set the meter to read 0.00. <br /> 6. Turn the electrode mode switch to the AIR position. If measurements are being <br /> made at sea level, use the AIR calibration control knob to set the pH meter reading <br /> to the prevailing barometric pressure, in millimeters of mercury (Hg), divided by <br /> 100. If the barometric pressure, in millimeters of mercury, at sea level is unknown <br /> or if the elevation is above sea level, refer to Tables D.1 and D.2 to obtain the <br /> correct AIR setting. <br /> 7. Turn electrode mode switch to the H2O position for sample analysis. <br /> • <br /> CO2119 <br />