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-.— .Environmental <br /> MEASUREMENT OF pH AND DISSOLVED OXYGEN USING THE <br /> ORION SA-210 PORTABLE FIELD METER <br /> The ORION SA-210 (Figure D-1) is a portable battery-powered digital instrument designed to <br /> accurately measure pH, Eh, and dissolved oxygen. If another model is used, refer to <br /> manufacturer's directions. <br /> METER CHECKOUT PROCEDURES <br /> 1. Slide power switch to ON position. <br /> 2. Slide mode switch to pH. If LO BATT indicator on liquid crystal display (I.CD) <br /> remains on, the battery must be replaced. <br /> • <br /> 3. When using an AC power convertor, disregard Step 2. Connect the convertor to the <br /> meter and to the appropriate power source. <br /> 4. Attach shorting plug to connector on top of meter. Slide mode switch to pH. Adjust <br /> CALIB knob to read a steady 7.00 on LCD. If this cannot be done, refer to operating <br /> manual. <br /> 5. Remove the shorting plug. The meter is ready for use with an electrode. <br /> • <br /> CO2115 <br />