Thermo Fisher Scientific C101 Colorimeter - Manual (Page 32)

Measurement: Chlorine Dioxide
C103 Colorimeter
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average the results. The result obtained should be approximately the
value of the standard used (please refer to instrument’s specifications for
data on meter precision and accuracy).
To re-calibrate the meter: All instruments are factory calibrated and user
calibration is not recommended. However, if a Chlorine standard can be
prepared, measured accurately and qualified by a different method
(titration, for example) or another instrument of higher precision and
accuracy, then a Chlorine standard in the 4.1-5.0 ppm Cl
2
range can be
used. Please refer to Section 3.2 Chlorine, Free & Total, Chlorine Dioxide,
Bromine and Ozone, for details.