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Although different brands of conductivity meters vary, calibration procedures are similar for all <br /> of them. A generalized calibrationp' ed follows: i <br /> 1: 'rum on the instrument,check the battery,and allow to warm up if necessary. <br /> I Rinse the coriductivity probe and temperature probe with deionized water then place in <br /> the standard solution. At Forward 1 conducti'vlties are usually within 500 to 1500 <br /> urnhosfL therefore the 1400 umhos/1 solution is appropriate to use, <br /> 3. Adjust the-meter for the appropriate conductivity scale and temperature then read the <br /> conductivity. <br /> 4. If required use,the "calibrate" adjustmezit on the meter to correct.the instrument to read <br /> the correct conductivity. <br /> The calibration process will be.recorded on a conductivity calibration-log:-Copies of calibration-. . <br /> logs for each individual-instrument arc-kept in-a:binder-atthe office: The logs-arc reviewed <br /> pcnodically to assess whether the instrument is becoming more difficult to calibrate and <br /> therefore needs adjustment by the manufactum,or if new probes are-required. <br /> Turbidity Metcr <br /> Turbidity measurement is subject to variations due to insmMent drift- For this reason turbidity <br /> meters must be caliibratod before and after sampling on ewh'day and at.least or=more during <br /> the day. * To calibrate a turbidity metcr-the instruiment reading is adjusted to read correctly for <br /> solutions with a standard turbidity. <br /> Standard turbidity solutions arc mixed fiesk according to package instructions, for each. <br /> sampling event. Standard solutions for turbidity commemialiy available. These standards - <br /> are purchased fresh and discarded after shelf life ired. Shelf lives vary depending on the <br /> d of standards used. If preVrepuvd solution is US4 the c 9fiation date of the solution will <br /> be noted on the calibration log. <br /> .Although different brands of turbidity meters vary, caEbration procedures are,similar for all of <br /> them. A generalized calibration procedure follows: <br /> 1. Turn on the instrL=erI4 check the battery,and allow to warm up if necessary: _- <br /> -'23-4838451-FOM3 IOR3Z A4 .kitty 14.2WO <br /> yQQQ ,jxiC- <br />