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meter to sound. This point is usWly clearly visible on the fit is not visible it should <br /> locaW by dipping probe into a water container whem the contact cleady seen den � <br /> marked. The total l of the water level meter should corr=pond with the length of the <br /> me=ning tape. In addition, the individual on theca'ble should correspond with the <br /> correct footage. if the led € measuring+ diff <br /> sbould be calculaftd as a perce, (Le.; 100 foot cible measugvs 102, feet - 8°%). <br /> measurements v4th the le should-dm be multiplied "98 to corrict for the error. If the <br /> individual fbouge marks are not placed correctly and am not in their devi "oro the <br /> iustrumext should be teplaccA <br /> If the waftr level indicator is constructedof a cable then calibration wol be p=fo=cd cin <br /> ce per <br /> year. If there is a ' y, the conversion factor will be marked di y on the izsstrmmt <br /> ''Fater level' rs constructed of tape arc more subjOct to Metching and should be calibrated <br /> every mo " .cd with the appropriate conversion, <br /> Calibration instrument will:be-rem ' .a bi .at th o c e&r- c_ <br /> red ce. The most ion results will also be recorded in the 14chniciaw field notes. <br /> .is no specific form for grater level indicator calibradom <br /> letter <br /> pH is. ,sect to significant vwiations due to t _ c, bufferipg capacity of'the vratcr, and <br /> For this reason FH me must be-callIxaftd, .. <br /> day and at Icaa once more during the day. To calibrate,a pH mtter the R=um=t"reading is <br /> 4usted to read correctly for solutions with a standartfpFL <br /> Standard solutions am mixedaccordingto PackAgc ias 'ci �for each sampling-1vent. <br /> Standard solutions or powders for pH 4,7.and W am commerdaUY available. Mx=standards <br /> .are purchased finsh sn& ed after sbeff life has expir� Shelf lives vary dopending on ft <br /> of If e seal `on is used.the oTiration daw of 'ou will <br /> be noted tura the oelibrationt <br /> Although diff is ofpli m "son p similar for all of them <br /> 1. Tum on the instrument, ow to Wam up if _4 <br /> 93949401 IOM A--2 jWy 14,2000 <br />