Experiment:
8 glass pH probes were calibrated in a pH 7 buffer and then placed in a freshwater testing solution to monitor pH. Once a week they were removed from the testing solution and placed back into pH 7 buffer where any drift from pH 7 was noted. The probes were then recalibrated and redeployed into the freshwater testing solution.
Results:
The graph below shows the weekly drift for each of the 8 glass pH probes over the 13 week period.
Conclusion:
The results of this experiment demonstrate the significant drift observed in glass pH probes over time. The average total drift after 13 weeks was 0.4 pH units, with an average weekly drift of 0.04 pH unit.
ANBs Solution:
These findings highlight the need for frequent, weekly calibrations of glass pH probes to maintain accuracy. In contrast, ANB Sensors’ technology offers a clear advantage by eliminating the need for recalibration. With ANB Sensors’ calibration-free design, users can rely on continuous, accurate measurements without the inconvenience of recalibrating, ensuring more reliable and hassle-free water quality monitoring.