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meter to sound. This point is usually clearly visible on the probe. If it is not visible it should t� <br /> located by dipping the probe into a water container where the contact'can be clean <br /> Y seen, then- <br /> marked. The total length 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 match the measuring tape then the diff, <br /> renec(if consistent) <br /> should be calculated as a percentage, (Le, 100 foot cable measures 102 feet a. 9$a/a), All <br /> measurements with the cable should-then be multiplied by 0.98 to correct for the emir. if the <br /> individual footage marks are not placed correctly and are not consistent in their deviation, the <br /> instrument should be replaced. <br /> If the water level indicator is constructed of a cable then oitibration will be performed once per <br /> Year. If there is a discrepancy, the conversion factor will be marked directly on theinstrument- <br /> Water level indicators constructed of tape are more subject to stretching and should be calibrated <br /> every 6 months and marked with the appropriate conversions.. <br /> Calibration data for each instrument will.be-reco ..and kept:ia a-binder at the:office for-ftm_ : - <br /> reference. The most recentcalibration results will also be recorded in the t=1micians field notes. <br /> There is no specific form for water level indicator calMration. <br /> off Metres <br /> pH is subject to significant variations due to temperature, buffering capacity of the water, and <br /> instrument drift Tor this reason pH metemmuist be-calibrated.before and agar sampling on each.. <br /> day and at least once more during the day. To `brate.a pH meter the incl,-merit reading is <br /> adjusted to read correctly for solutions with a standard pH. <br /> Standard solutions are mixed ficesh, according to packAge iamu+aiQris,-for each sampygg-event. <br /> Standard solutions or powder;for pH 4,7, and 10 are comznct tally available. These standards <br /> .are purchased fresh and-discarded after shelf life has equred. Shelf lives vary depending on the <br /> brand of standards used. If prc-prepared solution is the expiration date of dw solution will <br /> be noted on the cah''bration log. <br /> Although differcut brands of pH meters vary,calsib 'on proc aftuN s are similar for all of them. <br /> A generalized calibration procedure follows: <br /> l. Turn on the instrument,check the battery,and allow to warm up if necessary.. _- <br /> 23.483849-FO 1123 OR325 A-Z kitty I4,2040 <br /> Capmdx 2000 Ktct�e3Qa.� <br />