Laserfiche WebLink
• N <br /> meter to sound This point is usually clearly visible on the probe, If it is]hvisible it should k� <br /> .located by dipping the probe into a water container where the contact can be clearly seen, then' i <br /> marked. The total-length of the water level meter should coaespond with the length of the <br /> meastiring tape. In addition, the individual marks on the cable should correspond with the <br /> correct footage. If the cable does not match them ° <br /> 8 $ Hien the difference(if consistent) <br /> should be calculated. as a perowtage, (i.e., 100 foot cable measures 102. feet � 9$%), AD <br /> measurements nts with the-cable should-then be multiplied by 0,98 to correct for the error. If the <br /> individual footage mkb are riot placed correctly and are not consistent in their deviation, the <br /> iwtrment should be replaced. <br /> If the water level indicator is constructed of a cable then calibration will be performed once per <br /> year: If there is a discrepancy, the conversion factor will be mai•ked directly on the hntrutucat <br /> Water level indicators constructed of tape are more subject to stretching and should becaliibrated - <br /> every 6 months and marked with the appropriate conversion.. <br /> Calibratuin data for each instrument will.be.r=orded=d,kept:ira.binder at the of for-fuwre_•: - <br /> refer=ee. The most recent calibration results will also be recorded in the techni field nous. <br /> There is no specific form for water level indicator calibration. <br /> P—H M= <br /> pH is subject to significant variations due to tempeiatruc, buffering capacity of the water, and <br /> cat drift.•For this reason pH metas must be*calibraled before and after <br /> sampling on each.. <br /> day.and at least once more during the day. To cah-brate a pH meter the insU==t reading is - <br /> a4lusted to read correctly for solutions with a standardply. <br /> Standard solations are mixed fresh, according to packAge ° ns,-for each sampyng,evetut. <br /> Standard solutions or powders for pH 4,7, and 10 are y available. These standards <br /> are purchwed fresh and ed aecr shelf life has Shelf lives vary dqx=ding on the <br /> b of standards used. If prLprepared solution is used,the expiration date of the solution will <br /> be noted on the calibradon log. <br /> Although different brands of pH meters vary,calibrations are for all of them- <br /> A generalized calibration procedure follows: <br /> 1. Turn on the bstrument,check the ,and allow to w=up if nCces$M7.. _- <br /> 838494011231 OR32S A-2laly 14,2040 <br />