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Although different brands of conductivity meters vary, calibration procedures arc sirnilar for al, <br /> ol'them. A generalized calibration procedure follows: i <br /> 1: Tum on the <br /> instrument, check the battery,and allow to warn up if necessary <br /> 2. Rinse the cociductivity probe and temperature.probe with deionized water then place in <br /> the standard solution. At Forward Landfill conductivities are usually within 500 to 1500 <br /> uznhoA 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 meter to correct.the instnEmeni to read <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-•kcpt in-a:binder.•at•the office: The 109S-am reviewed- <br /> Periodically <br /> eviewedperiodically to assess whether the. instrument is becoming more difficult to calibrate .and <br /> therefore needs adjustment by the manufacturer,or if new probes a=-required. <br /> TUrb' <br /> idEty Meter _ <br /> Turbidity measurement is subject to variations due to instnunent drift. For this reason turbidity <br /> metas must be calibrated before and after sampling on each day and at_least once more duiing <br /> the day. To calif ate a turbidity meter-the instrument reading is adjusted to read correctly for <br /> solutions with a standard turbidity. <br /> Standard turbidity solutions arc mixed fresh, according to pacscage instructions, for each <br /> sampling event. Standard solutions for turbidity arc commercially available. These standards <br /> are p • ed fresh and discarded after shelf life has ectpired. Shelf lives vary depending on the <br /> brand of standards used. If preTrepared solution is used, thz expiration date of the solution will <br /> be noted on the calibration log. <br /> Although different brands*of turbidity meters vary, calibration procedures are similar for all of <br /> them. A generalized calibration procedure follows: <br /> 1. Torn on the instrument,check the battery,and allow to warm up if necessary; <br /> 849-Fo11231oR32S A-4 hilt' 14,2040 <br /> 20M xkk&1d.:r,I*- <br />