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p <br /> meter to sound. This point is usually cleakly visible on the probe. If it is not visible it should <br /> .located by dipping the probe into a water container where the contact can be cleaKlY seen, den <br /> marked. The total-1togth of the water level meter should correspond with the length of the <br /> measuring tape. In addition, the individual on the cable should correspond with the <br /> correct footage. If the cable does not thatch e t <br /> g g then the difference(if consistent) <br /> should be calculated as a percentage, (i.e.; 100 foot cable measures 102. feet zm 98V). All <br /> measurements with the-cable should-then be multipliedby 0.98 to correct for the error. If the <br /> individual footage marks are riot placed correctly and arc not consistent in their deviation, the <br /> instrument should be replaced. <br /> If the water level indicator is constructed of a cable hien CaIibration will be performed once per <br /> year. If there is a discrepancy, the conversion factor will be marked dfi=tly on the instrument. <br /> Water level indicators constructed of tape are more subject to=etching and should be calibrated <br /> every 6 months and marked with the appropriate conversion,. <br /> Calibration data for each- ent will.be.secorded.and keptain a.binder at the:office forfeiture.-_ -- <br /> reference.. The most t calibration results will also be recorded in the to 'c" field notes. <br /> There is no specific form for water level indicator calibration. <br /> PH Inde cr <br /> PH is subject to si ' cant variations due to temperatym, buffering capacityof the water, and <br /> eni drifL-For this reascm pH meters m tbrated b-cforcand a€tw sampling on each. <br /> day and at least once more during the day- To calibrate a pH meter the instrument reading is <br /> adjusted to read correctly for solutions with a standard pH.. <br /> Stan solutions arc mixed fiesh, ac-cording to packAge instrucdo for each sampling-event. <br /> Standard solutions or powders for pH 4,7, and 10 are commtrciaffy aTailable. standards <br /> ed finsh and ed after shelf e Shelf lives d on the <br /> bund of standards usvi If pre-prepared pre-preparedsolution is the expiration daeof die solution will <br /> be noted on the calibration log. <br /> Although differtnt bunds of pH m calibration procedures are similar for all of them. <br /> A generalized calibration procedure follows: <br /> 1, <br /> Tuin on the instrument,check the battery,and dlow to warm up if nocessary,. =- <br /> 83849- M I OR3z A-2 My 14,200 <br /> C4PYr4*2M K1 ,bac„ <br />