Laserfiche WebLink
SOP NUMBER 8.0 <br />Page 9 of 10 <br />Field Parameter Measurements <br />1.2 Specific Conductivity Meter <br />Calibration is done by determining the cell constant. The cell constant of the conductivity <br />measuring cell can be determined by calibrating in the control standard in the range of 0.45 to <br />0.5 cm-1. <br />1. Connect the conductivity cell TetraCon 325. <br />2. Set measuring mode to conductivity by pressing the button on the upper left hand corner <br />labeled as pWmV X. Using the up and down arrows select conductivity. <br />Press and hold down the CAL button until you see CAL and temperature on the screen of the <br />meter. <br />4. Immerse measuring cell into control standard solution 0.01 mol/I KCI. <br />5. Next press the RUN/ENTER button. You should get a value between 0.45 and 0.5 cm'. <br />6. The MultiLine P3 automatically considers the temperature dependence of the control <br />standard solution and stores the determined cell constant. You are now ready to do <br />conductivity measurements. <br />7. Note that the probe must be placed in the center of the solution container to prevent <br />disturbance of the electrical field. <br />1.3 Dissolved Oxygen Meter: <br />General procedures for using a D.O. meter will be as follows: <br />To calibrate the D.O. meter first connect the D.O. probe CellOx 325. <br />Press the button pH/mV OZ until you see O2 on the screen. Set measuring mode to dissolved <br />oxygen concentration using the up and down arrows on the meter. <br />Press the CAL button until you see CAL on the screen of the meter. <br />Place probe in the air calibration beaker. <br />The sponge in the beaker must be moist (not wet!). See also the section of the operation manual <br />entitled Oxical - SL in the appendix of the operating manual. <br />Press RUN/ENTER button. You will see the AR flashing on the screen of the meter wait until it <br />stops and you will see the relative slope of the probe on the screen. The admissible range is 0.6 <br />to 1.25. Your meter is now ready for use. <br />1.4 Oxidation Reduction Potential Meter <br />Calibration of the redox electrode is as follows: <br />Connect the redox electrode. <br />Set measuring mode to mV by pressing the pH/mV button. Using the up and down arrows on <br />the meter select mV. <br />Immerse electrode into Mettler redox buffer solution 220mV (pH 7) UAg/Agcl <br />Powertech <br />4/23/2007 <br />Rev SOP 8-1 JAB <br />8-9 <br />R Squared Inc <br />