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t Although different brands of conductivity meters vary, calibration procedures are similar fo <br /> of them. A e r ' <br /> generalized calibration procedure follows: i <br /> L -'tuu on the' ent, check the battery, and allow to warm up if necessary, <br /> Z, Rinse the conductivity probe and temperature.probe with deionized water then place in <br /> the stabdard solution- At Forward L.andfilf conductivities are usually within 500 to 1500 <br /> umhosll,therefore the 1000 umhosll solution is appropriate to use. <br /> 3. Adjust the-meter for the appropriate conductivity scale and temperature then read the <br /> conductivity. <br /> 4- If rdquired use the "ca.libmte" adjustment on the meter to correct.the instn=,=t to read <br /> the correct conductivity. <br /> The calibration process will be.recorded on a conductivity calibration-log: Copies of calibratioar. . <br /> logs for each individual•itu rument<arc-kept in-a:binder-at-the- <br /> Office- The Ings-ate ravicwed <br /> geiodically to assess whether the. instrument is becoming more difficult to 'brate and <br /> therefore needs adjustment by the manufacturer,or ifnew probes axe-regerirecL <br /> • Turbidity Meter _ - } <br /> Turbidity measurement is subject to variations due to instrument drift. For this reason turbidity <br /> Met=must be calibrated before and after sampling on each'day and at 1 zst Duca more during <br /> the day. ' To calibrate a turbidity meter the instrument reading is adjusted to read coy for <br /> .solutions with a standard turbidity. - <br /> Standard turbidity solutions are mixed fresh, according to package instructions, for each. <br /> sampling event. Standard solutions for turbidity are commercially available. These standards <br /> are ssed and discartled.after°shelf life:has expired. Shelf lives vary depending on the <br /> brand of standards used. If pre solution is used, tha. Ccphatioa data of the solution will <br /> be noted on the cah"gration log. _ <br /> Although different brands'of turbidity metas vary, calibration procedures are,similar for all of <br /> them.. A generalized calibration procedure follows: <br /> l. Turn oa the instrumen4 check the battary, and allow to warm up if necessary- <br /> 1\23 IOR3Z <br /> ecessary.1\2310R3ZS A-42040 <br /> CWfr[IU 2M *14,e J <br />