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Althatagh different brands of conductivity meters vary, calibration procedures are si ' <br />of them. A generalized calibration procedure follows: gym' for ai, <br />l: Turnon the instrument, 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 standard solution. At Forward Landfilfconducfivities are usually within 500 to 1504 <br />umhoA therefore the 1000 umhosA 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 required use. the "calibrate" adjustment on the metes to con -ca. the insirumeni to lead <br />the correct conductivity. <br />The calibration- process will be. recorded on a conductivity calibration -log_ - Copies of calibration - <br />logs for~ each individual -instrument are -kept in -a: binder:-at•thc- office: The logs -ale reviewed <br />periodically to assess whether the instrument is becoming more difficult to calibrate and <br />therefore needs adjustment by the manufacturer, or if new probes are -required.. <br />Twbifjnty Meter _ <br />Turbidity measurement is subject to variations due to instrument drift_ For this reason turbidity <br />meters must be calibrated before and after sampling on each day and at-' least once more during <br />the day. ' To calibrate a turbidity meter the instrument reading is adjusted, to read coniectly for <br />solutions with a standard turbidity. <br />Standard turbiditymixed t .saccordingto 1 . instructions, for each.r <br />SaMpling evemt Standard solumms for utrbidity arc commercially available. TheC standards <br />are Mch.ased fresh i . • • disc. • a:after shelfhas .i'; ! wt Shelflives , dq=ding on t1 <br />bmnd,of standards used. If pre-prVared solution is used, dit CVhtioa date of the solution will <br />be • • e! on the cah-bration f <br />g. <br />Although different brands 'of turbidity meters vary, calibration procedures are similar for all of <br />them. A generalized calibration procedure follows: <br />l . Turn on the instrument, check the battery, and allow to warm up if necessary: <br />® `23-M$494oatx3iax3zs A4 M,i4,,2WO <br />C"rf& =0 Kkkffdr. L <br />