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_ K <br /> meter to sound. This point is usually cleady visible can the probe If It is at " sble it should t <br /> locateld bydipping into a water container whem the contact can beclea4ysee <br /> Make& 11tc. total'Itno of the water level meterthen <br /> s ctld rO aid with the length of the <br /> to `ng tape. In aMdon, individual marks on the cable should comspond with the <br /> tvct tae. If the cable does not match the mcasttring , _ t) <br /> should be calculated as a percentage, Le., 100 f t . le measures 10:2 f qS4/}. All <br /> Measureman withl dmultiplied by US to corria for the <br /> r. If the <br /> individual footage staft are not placed correctly and am not consistent in de . •on, the <br /> Inst 3 <br /> If the water level indicator is constructed of a cable then caAratian will be perf zned ortce:per <br /> year- If the Is a disanpaxxy, the conversion factor wiff be:marked directly on the inWit. <br /> Water level lead rs C-Onsumaed of tape are more subjectto stretching and should be cah- ted <br /> every 6:months. d marked with the appropriate conversion- <br /> Calibration <br /> ony i`b i_ t o - Wa b at th,-ojMoe f br-f c"•: <br /> rtftxmce. IIx most recent calibration results will also be recorded in the t . . field <br /> Them <br /> is no specific Ibim for water level indicator catibratkuL <br /> e <br /> PH <br /> is subject to sisufficant variations due to t qcity of the vfater, wd <br /> For this reason pH meters must be,calibrated,before and after sampling on each <br /> day and at tent once 0= dudng the ray. To calibrate a pH meW the insUvnx=readingis <br /> to y for solutions with a <br /> Standard solutions are mixed fi=k according to Pwkage in=ucaons.,for each sampring event., . <br /> Standard solutions or e H 4,7s and 10 are commercially available, rds <br /> ed riled after shelf Ufe has expired. Shelf lives vary depending on the <br /> of standards used. if lution is the:expiration daft of the <br /> solution will <br /> be noted can the ealibtation log. <br /> i of'pHcaMratioa procodt= an similar for&0 of them <br /> A d collo <br /> I. Tum can the instrument,check dx battery.and allow to wam up If necossary.. <br /> 93949-FO Ik23 IOR32S ,A-2 14,200 <br /> Kk*k <br />