GE Analytical Instruments ©2009 140 of 236 DLM 90488-01 Rev. A
Press the USB I/O button. Make sure that the USB flash memory drive is attached to the
USB port, and then press the Save System button.
Perform Annual Maintenance Tasks
Before calibrating the Analyzer, perform annual maintenance tasks as appropriate, such as
replacing the sample pump tubing, UV lamp, chemical reagents, and resin bed. In particular, if the
calibration coincides with the Analyzer’s annual maintenance, first replace the resin bed before
proceeding; for more information, see “Replacing the Ion Exchange Resin (Resin Bed)” on page 182.
Perform a TOC Autozero
The optional TOC Autozero corrects for minor differences in the response of the two CO
2
sensors.
This adjustment is critical only for the determination of low-level TOC concentrations. Only perform
this procedure before calibrating the Analyzer if you regularly analyze samples with
TOC <50 ppb.
The TOC Autozero requires that the on-line water supply be available to the Analyzer. Make sure the
sample inlet is configured properly before continuing.
The TOC Autozero can require between 1-12 hours to complete, but it typically requires less than 2
hours when the Analyzer has been measuring water containing 50 ppb TOC or less.
1. If the Analyzer is taking measurements, press the Stop Analysis button.
2. If you have an ICR unit, make sure the lever is in the Inline position.
3. Press the Menu button, select the Maintenance tab and press the Calibrate button.
4. Press Run TOC Autozero.
5. Make sure that a water source is connected and press Start.
Note: If you want to manually calculate the calibration formulas for your records, you must print
the Calibration History from the Analyzer before and after performing the new calibration,
in order to have access the values of the TC Slope and IC Slope.
Note: The TOC Autozero is part of the calibration procedure only if the Analyzer is being used
with water that is less than 50 ppb TOC. If the Analyzer is being used off-line or to
analyze water that is greater than 50 ppb, you do not need to perform a TOC
autozero.
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