Ionics Instruments 2004 Page 6-19 DLM 30007-08 Rev. A
the ± 3% repeatability of the analyzer. It is best to set the number of
repetitions to 2 or more to ensure an accurate TOC value. Using four
repetitions allows rejection of the first value and calculation of a
standard deviation using the remaining three values.
5. Press CLEAR to return to the GRAB SAMPLE SETUP menu.
6. Use the arrows ( or ) to scroll to REJECTIONS and press
ENTER. The GRAB REJECTIONS screen is displayed:
ENTER
CLEAR
GRAB REJECTIONS
REJECTIONS: 0
CHANGE TO: 1
RROWS TO CHANGE
ENT = SET, CLR = EXIT
FIGURE 6-24: GRAB REJECTIONS Screen
The REJECTIONS option determines how many of the replicate
measurements will be used in calculating average values and
standard deviations. In most cases, reject the first measurement to
yield a more accurate average value.
7. Use the arrows ( or ) to set the number of measurements to be
rejected and press ENTER to save the value.
8. Press CLEAR to return to the GRAB SAMPLE SETUP menu.
9. Use the arrows ( or ) to scroll to STATISTICS and press ENTER.
The STATISTICS DISPLAY TYPE screen is displayed:
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