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Although different brands of conductivity meters vary, calibration procedures are similar for al,- -of them. A generalized calibration procedure follows: i 1: Tum on the instrument,check the battery,and allow to warm up if necessary. �- Rinse the conductivity probe and temperature probe with deionized water then place in the standard solution. At Forward conductivities are usually within 500 to 1500 umhos/l,therefore the 1000 umhos/l solution is appropriate to use, 3_ Adjust the meter for the appropriate conductivity scale and temperature then read the conductivity. 4_ If required use.the "calibrate" adjustment on the meter to correct-the innstrumeni to read the correct conductivity. The calibration process will be,recorded on a conductivity calt'bration log_-Copies of calibration• logs for each individual-instrument arc-kept in-a.bind=-at-(hC`office; The logs-am reviewed periodic:atIy to assess whether the instrum=t is becoming more difficult to cats ,e and therefore needs adjustment by the mauufacturrx,or if new prones am-required, Twfiidity Meter _ Turbidity measurement is subject to variations due to instrument drift. For this reason turbidity meters must be calibrated before and after sampling on each day and at least once more during the day. To calibrate a turbidity.ureter-the instrument reading is adjusted to read correctly for - .solutions with a standard turbidity. Standard turbidity solutions are mixed fresh, according to paeicage instructions, for each. - sampling event. Standard solutions for aniAdity am commer=affy available, These standards are purchased fresh and discarded after shelf life has expired., Sheaf lives vary depcuding on the bread of standards used. If prcVrepared solution is used,the expiration date of the solution will be noted on the calibration log. Although different brands of turbidity meters vary, calibration procedures are similar for all of theta. A generalized caUbradon procedure follows: 1. Turn on the instrument,check the battery,and allow to warm up if necessary: _- 23-433 E49-FOI%23 t OR3Z A4 fitly 14,?,000 C.orld&2M KkInfeAer.lac,