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Although different brands of conductivity meters vary, calibration procedures are similar for al, <br /> of them. A generalized calibration procedure follows: t <br /> l: urn on the instrument,check the battery, and allow to warm up if necessary <br /> 2. Rinse the conductivity probe and temperature probe with deioaized water then place in <br /> the standard solution. At For' 1 conductivities are usually within 500 to 1500 <br /> umhasll,therefore the 1000 umhosll solution is appropriate to ase.. - <br /> 3. Adjust die,meter for the appropriate conductivity scale and temperature then read the <br /> conductivity. <br /> 4. If required use.the "calibrate" adjustment on the meter to correct.the xu?sirutment to read <br /> the correct conductivity. <br /> The calibration process will be xecorded on a conductivity ca.libaation'log: Copies of calibration <br /> logs for each individual•instrument are-kept in-a: ' der.-at•thcof ce; ?hc logsamreviewed <br /> periodically to assess whether the-instrument is becoming more difficult to cah'brate and <br /> therefore needs adjustment by the manufacturer,or if new probes are-required. <br /> } <br /> Turbidity Meter <br /> Turbidity measurement is subject to variations due to instrument drift. For this reason turbidity <br /> meters must be calibrated before and atter sampling on eackday and atle=once more during <br /> the day. - To calibrate a turbidity metcr•the instrument reading is adjusted to read copy for <br /> solutiuons with a standard turbidity. <br /> Standard turbidity solutions are mixed fiesk a=rding to package instructions, for each- <br /> sampling event. Standard solutions for turbidity are coramorcially available. These standards <br /> we purchased fresh and discarded.af L=shelf life has expired. Shelf lives waxy depending on the <br /> brand of standards used. If pre-mc solution is used,the expiration date of the solution will <br /> be noted on the calibration log. <br /> Although different brands'of turbidity meters vary, calibration procedures are similar for all of <br /> them- A genic alized calibration procedure follows: <br /> 2. Turn on the instrument,check the battery,and allow to warm up ifneccssary: _- <br /> E49401123IOR323 A4 laty 14,ZfloO <br /> 2000 rJda&tcjV,lac <br />