What is the probe accuracy?
The accuracy of the system is limited by resolution (random noise), deviations from the Stern-Volmer relationship, and the accuracy of the calibration experiments. The Stern-Volmer relationship is valid for low-pressure oxygen levels, such as found in water. Deviations from the Stern-Volmer relationship occur primarily at higher-pressure oxygen levels. These deviations can be quantified, and the calibration adjusted, by obtaining several calibration points instead of the normal high and low. The accuracy of the calibration is itself important. The figure below shows the magnitude of the error that results from a 1% error in recording either I0 (intensity of fluorescence at zero-pressure oxygen) or the intensity at the high calibration point.
