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| control charting - control charting should be done with the 440 ppm EG/DEG standard, prepare above.If the standard falls out of control,prepare a new standard at this level and reanalyze.If the new standard is still out of control,replace the liner and rerun the standard .If this also out of control, recalibrate over the entire range.If the new standard with the new liner is in control,reanalyze the 220 ppm standard and the 700ppm standard.If their values are within 15% of the original calibration values,recalibration is not necessary.Otherwise ,recalibrate over the entire range. |
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