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<br />1 <br />1 <br />1 <br />1 <br />Conductivity <br />1 <br />' Te~erature <br />1 <br />1 <br />1 <br />1 <br />~E s (oon't) <br />N C~ FIELD IlSI7 <br />Enter the make, <br />model, serial and/ <br />or ID nnnt~ber' for <br />each meter in a <br />log book. <br />Etnter the make, <br />model, serial <br />rnanber and tem- <br />perture range for <br />each thPrmcxmter, <br />All ~*a~a**3~zation <br />shall be against an <br />Nffi or Nffi cali- <br />brated thermometer. <br />Readings should <br />agree within 1°C. <br />All data shall be <br />read to the nearest <br />1°C. <br />Calibration <br />1) QiecJc the cell constantr periodically <br />per manufacturer's instuctions. If <br />the cell test irdicate5 low readings <br />the probable cause is dirty electrodes. <br />If cleaning does not rAstore probe <br />performance, re-platinilzing is <br />required. Cleaning and re-platinizing <br />mist be done according to manufao- <br />turer's instructions. <br />2) Rinse cell after each Sample to pre- <br />vent carryover. <br />3) Check the meter using a KCl stanlarr3 <br />before taking to the field. <br />1) Check general condition of thernio- <br />meter. <br />2) At least once per year each thermo-- <br />meter shall be checked at two <br />tea~eraturps against an NHS thermo- <br />meter. Te~erature readings shall <br />agree within 1 ° C or the thennareter <br />shall be replaced or reralibrated. <br />