Best practices for autonomous measurement of seawater pH with the Honeywell Durafet.
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Bresnahan Jr., Philip J.
Martz, Todd R.
Johnson, Kenneth S
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Performance of autonomous pH sensors is evaluated by comparing in situ data to independent bench-top measurements of pH and to co-located pH, O2, and pCO2 sensors. While the best practice is always to deploy a properly calibrated sensor, the lengthy time period required for sensor conditioning and calibration often results in sensor deployment without comprehensive calibration. Quality control (QC) procedures are examined to determine the errors associated with different in situ calibration approaches and lay a framework for best practices. Sensor packages employing the Honeywell Durafet remained stable across multiple deployments for over nine months. However, sensor performance was often limited by biofouling. Regional empirical relationships for estimating carbonate system parameters are shown to enable identification of otherwise indistinguishable sensor offset and drift when multiple sensor types are co-located. Uncertainty is determined by calibration approach and m.....
JournalMethods in Oceanography
Maturity LevelTRL 8 Actual system completed and "mission qualified" through test and demonstration in an operational environment (ground or space)
Best Practice TypeBest Practice
CitationBresnahan Jr., P.J.; Martza,T. R.; Takeshita, Y.; Johnson, K.S. and La Shomba, M. (2014) Best practices for autonomous measurement of seawater pH with the Honeywell Durafet. Methods in Oceanography, 9, pp.44-60. DOI: http://dx.doi.org/10.1016/j.mio.2014.08.003
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