Laserfiche WebLink
. k <br /> meter to sound This point is usually cleakly visible on the probe. If it is notvisible it should t� <br /> located by dipping the probe into a water container when the contact can be clea <br /> dY 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 oa the cable. should correspond with the <br /> correct footage. If the le does not match the measuring g then the diff cc(*if consistca0 <br /> should be calculated. as a percentage, C.e, 100 foot cible measures hozfeet 8°/®).. All <br /> measurements with the cable should-then be multiplied by 0.98 to correct for the error. If the <br /> individual footage marks am not placed correctly and are not consistent in their deviation, the <br /> i=rument should be replaced. <br /> If the water level indicator is constructed of a cable then calibration will be peiforme d once per <br /> year. If there is a discrepancy, the conversion factor will be marked directly on the: <br /> instruznent. <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 conversion.. <br /> Calibration data for each insizurnent will.be-recorded and kept:ia a.binder•at the:office for-fcrture_-: <br /> reference. The most receatcalibration results will also be recorded in the ttclunciaris field notes. <br /> There is no specific form for water level indicator calibration. _ <br /> �H e#cr • <br /> PH is.subject to significant variations due to tempmabge. buffering capacity of thewater, and <br /> instrument For this reason pH metasr must be-cafflore and after samplingon each.. <br /> dayand at least once more -during the day. To calibrate a pH meter the . cnt r=jing is - <br /> 4usted to read coately for solutions with a star pl-l- <br /> Stanclard solutions are mixed fiesk according to package instructions,for each samplingevent. <br /> Standard solutions or powders for pH 4,?, and 10 are Ounruercially available. These standards <br /> p ed fresh and'discarded after shelf life has cTfitd. Shelf lives very dcp=ding on the <br /> brand of standards used. if solution is used,the c9tiration date of die solution will <br /> be noted on the:calibration log. <br /> Although diffdif ferent brands of pH meters vary, calibration Pr0Cak1rq3 are similar for all of them. <br /> A gwa ion procedure follows: <br /> I. Tvxn on the kstrumcnt,check the bafteay,and allow to wa=up if n ary.. ` <br /> P <br /> 83949-FO 1%23 l OR32S My 14,x000 <br /> CVqrW 2M X14«Iftc- <br />