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meter17_� <br />to sound. This point is usually clearly visible on the probe. not visible <br />-located by dipping die probe into a water container where the <br />contact can be clearly Seen, then <br />marked. The total -length of the water level meter sho <br />uld correspond with the <br />lengthof the <br />measuring tape. In addition, a individual op the cable should convvond with the <br />correct footage. If the cable does not match the measuring "ape then the diftermce Of <br />consistent) <br />should be calculated.p=ent:`:., is foot cablemeasures R , <br />tf _ . , <br />measurements r, cable should be multiplied T 1' to r i error. <br />the <br />individual •• marics ire not 1 -aced • and am Ifconsist cut1their •. r• <br />r <br />iaitament should be replace& <br />If the r lr •constructed ofa cable!"1c�librationwill be •. • if e• oncef <br />year. <br />% discrepancy, the conver:monfactor <br />■: • be marked r : o' on theinstrument. <br />Water level indicators constructed of • more subject <br />to stretching r should! calibrated r <br />Calibration data for each went will.be o _nd keptaai -a .binder at the: <br />off cr for -future_ _ reference. The most recent calibration results will also be recorded in the tecbni d ns field notes - <br />There is no specific form for water level indicator calibration. <br />pH Met <br />PH is.subjectto significant v.t . ! • r due to temperature,buffering capacity <br />o the water,• t <br />cr a r•ye + For this reason pH meters -must • cah1mated before •. r after sampling on ✓.. `r. <br />day and, <br />atleastonce moreduring the;: t■calibrate PH metertheInstrument reaiding is <br />i A ( to readcorrectly rsolutions aIa standardpFL <br />'.•f..i'. solutions are •I•ce erraccording • •a■:.tr«:f•f r. <br />each a•f r t• er' <br />Standardsolutions■, for • ta': iare COMmetki4yavailable.rte,... standards <br />.we purchased t.... i. ► • discarded .t ). lifhas rThnt Shelf... vary depending / t It <br />brand of standards used. If pre-prepaxt-d solution is used� the cq&ation date of the solution will <br />be noted on the calibration log. <br />Although diffof pH meters vary, oalibration procedures We Similar for all of them <br />A genciaLized calibration p follows: <br />L Turn on the instrurcent, check the battery, and allow to warm up if necessary.. -j <br />83849 -FO R23 l OR32S A-2 Jn1y 14, x044 <br />2M xkwewa.lac. <br />