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� i i i �� • <br /> Environmental <br /> pH CALIBRATION AND MEASUREMENT <br /> For maximum accuracy, a two-buffer calibration shall be completed at the beginning of each day <br /> and after each power-up of the meter. The two-buffer calibration provides the correct setting for <br /> degrees Celsius (°C)/slope control. As long as the meter has not been turned off, a single-buffer <br /> calibration (instead of a two-buffer calibration) can be used before making subsequent <br /> measurements. It is suggested that the two-buffer calibration be completed at least three times a <br /> day. <br /> The following instructions apply specifically to the Orion Model 91-06 pH meter. If another <br /> model is used, refer to manufacturer's directions. <br /> Two-buffer calibration <br /> 1. Connect pH electrode (ORION Model 91-06) to the meter and rinse the electrode <br /> with distilled/deionized (DS/DI) water. <br /> 2. Set °C/slope control to buffer solution temperature (°C). <br /> 3. Place electrode in pH 7 buffer solution and stir moderately. <br /> 4. Slide mode switch to pH. Allow reading to stabilize, then adjust CALIB knob so that <br /> correct buffer value at that temperature is displayed. <br /> 5. Remove electrode from the buffer solution and rinse with DS/DI water. <br /> CO2116 <br />