Aquaprobe
®
Lite Instruction Manual
10401-00976 Rev F
18.5. What is the Accuracy of the Optical Electrodes?
The accuracy figures quoted throughout this document represent the equipment’s capability
at the calibration points at 25
°
C. These figures do not take into account errors introduced
by variations in the accuracy of calibration solutions and errors beyond the control of the
manufacturer that may be introduced by environmental conditions in the field.
Accuracy in the field is also dependent upon
full calibration
and minimal time between
calibration and use.
All Optical Electrodes, with the exception of the Turbidity Electrode, employ fluorescent
measurement techniques. Interference from microbiological species and compounds which
fluoresce at similar wavelengths and differences in fluorescence caused by temperature,
ambient light and turbidity can all cause inaccuracies.
Fluorescence measurement is ideal for researchers who are interested in detecting the
presence or absence of a specific substance in reasonable concentrations and measuring
relative fluorescence changes that can be used as an indication of increasing or decreasing
concentrations. Fluorescence measurement techniques are not ideal for quantitative
measurement and it is therefore impossible to specify an absolute accuracy.
In order to obtain accurate results, data obtained with a fluorescent electrode in the
field must be post-calibrated with data from standard laboratory analysis of grab
samples acquired during the study.
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®
Ltd.
www.aquaread.com
Page 72 of 72
