GE Analytical Instruments ©2009 148 of 236 DLM 90488-01 Rev. A
•The R
2
is ≥0.990.
• The % Diff for each IC standard is ±10% or less.
If these conditions are satisfied, press Apply to accept the calibration and continue.
If these conditions are not satisfied, press the Cancel button to reject the calibration. You
may need to perform the calibration procedure again. However, first consult the chapter
called “Troubleshooting” on page 195 to determine if there is a problem with the Analyzer.
The % Difference value is calculated as follows:
The Expected TC Concentration equals the Certified TOC Concentration of the standard,
plus the measured TOC Concentration in the Calibration Blank, plus the Measured IC
Concentration of the standard.
The IC standards are measured with the UV lamp off. Under those conditions, the readings
of the TC channel are expected to match the readings of the IC channel. Therefore, the
Expected IC concentration equals the measurement made by the TC channel, while the
Measured IC concentration equals the measurement made by the IC channel.
19. Remove the 50 ppm IC Calibration Standard from the IOS System.
20. You should now verify the calibration. Proceed to “Performing a Calibration Verification” on
page 149 for instructions.
% Diff =
Measured Concentration - Expected Standard Concentration
Ex
ected Standard Concentration
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
100%×
TCexp = TOCstd + TOCblank + ICstd
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