Ionics Instruments 2004 Page 9-16 DLM 30007-08 Rev. A
1. Place the 1/16" Teflon inlet tubing in the flask containing the site-prepared IC
standard or in the Ionics Instruments-prepared standard labeled IC Calibration
Standard. Make sure the end of the tubing is several inches below the liquid
level.
2. From the GRAB SAMPLING menu, use the arrows
( or ) to scroll to
START and press ENTER. The analyzer will make 10 measurements. When
the measurements are finished, the average TC value and relative standard
deviation for the last three TC measurements for the IC standard will be
displayed. Record this average TC value on the Calibration Worksheet.
Additionally, the CV (relative standard deviation) for the last three TC
measurements of the IC standard should be less than 3%. If this value is
greater than 3%, repeat the measurements of the IC standard. The CV value
appears on the analyzer’s printout, or can be calculated as follows:
Record the values on the Calibration Worksheet.
3. Use the arrows ( or ) to scroll to EXIT and press ENTER to display the
Main menu.
4. Scroll to HISTORY and press ENTER.
5. From the TOC history display, press ENTER twice to display the IC values.
6. Calculate and record the average value from the last three IC measurements
on the Calibration Worksheet.
1
2
)(
Deviation Standard
−
∑
−
=
n
xx
se
ain tsMeasureme
ofNumber n
Average x
Result x
of Sum
=
=
=
∑
=
100 x
Average
Deviation Standard
(RSD)Deviation Standard Relative =
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