Recalibrating the Shallow SeapHOx data with a new method yielded significant gains in accuracy throughout the entire 1000 hour time-series. The new pH calibration method takes inspiration from Sea-Bird Scientific’s established history of calibrating CTDs, sweeping pH sensors across a wide range of temperatures for a more refined calibration in a highly stable calibration bath. After reprocessing the data with the improved coefficients, the sensor’s output outperformed its expected accuracy specification by a sizeable margin.

All ISFET pH sensors leaving Sea-Bird Scientific’s facility now benefit from the new calibration method. This includes the SeaFET V2, SeapHOx V2, Deep SeapHOx V2, and Float pH.