Ionics Instruments 2004 Page 9-1 DLM 30007-08 Rev. A
CALIBRATION
ATTENTION!
If the analyzer is part of a system containing an Autosampler, please refer to the
Autosampler Operation and Maintenance Manual for DataPro or
DataPro/DataGuard and follow the calibration procedure found there.
The calibration procedure found here for the 800 Series is slightly different
from the calibration procedure for the 800 Series using an autosampler. The
autosampler procedure contains one extra equation because all the calibration
standards are run at once and then adjustments are made to the calibration
constants. This procedure runs the TC standard, makes an adjustment and
then runs the IC standard, eliminating the need for the extra equation.
The analyzer was calibrated at the factory; calibration should be stable for at
least one year. If the UV lamp is changed per the six month schedule,
perform a verification of the calibration; re-calibration should not be necessary.
Calibration constants are used to account for the recovery of CO
2
in the
membrane module for the TC and IC channels. Another factor, the TC Zero
Offset, is used to match the response of the TC and IC CO
2
sensors for low-
TOC deionized water. The procedures described below allow for checking of
the calibration and, if necessary, changing of the calibration values.
Calibration involves:
Using low TOC, DI water to set the TC Zero Offset,
Using a 25 ppm TC standard to set the recovery of CO
2
in the
membrane module for the TC channel,
Using a 25 ppm Na
2
CO
3
standard to set the recovery of CO
2
for the
IC channel and,
Rechecking the TC and IC calibration by re-analyzing the standards.
A complete recalibration may be performed, or only recalibration of the TC
Zero Offset or the TC and IC calibration constants. If desired, turn off the
WARNING#42 option under SETUPOUTPUTS to disable the low TOC/IC
ratio warning during the calibration.
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