PRODUCT SHEET HIGHLY ACCURATE DRIFT AND CALIBRATION FREE PH ANALYZER Characterizing the marine carbonate system to the level of accuracy required by marine scientists The CONTROS HydroFIA™ pH is a flow-through system for the determination of the pH value in both saline solutions and brackish waters. It's an autonomous pH analyzer that can be used in the lab or easily integrated into existing automated measuring systems on e.g., voluntary observing ships (VOS). A unique and flexible system, CONTROS HydroFIA™ pH is a vital research instrument for measuring ocean acidity, which is a key indicator of man-made climate change. OPERATING PRINCIPLE For the determination of pH, the reagent m-Cresol Purple is added to the sample, and the absorption spectra are measured using VIS absorption spectrometry at 25°C, from which pH is calculated using the approach of Mueller and Rehder (2018). For each measurement, only a small volume of indicator dye is injected into the sample stream. BENEFITS Measuring the pH value using m-Cresol Purple is an absolute measurement method. Combined with the technical implementation, this analyzer is calibration-free and therefore suitable for long-term applications. Furthermore, the analyzer can be used for monitoring e.g., shortterm biogeochemical processes. Minimal maintenance requirements and low reagent consumption further contribute to extended deployment durations. Once the analyzer runs out of reagents, the cartridges can be easily exchanged due to a user-friendly design. In addition, the low sample consumption enables the pH determination from small sample volumes. Integration into automated measuring systems on VOS ross-flow filters C for high turbidity / sediment loaded waters dditional acid / A indicator

PRODUCT SHEET CONTROS HydroFIA™ pH APPLICATIONS The CONTROS HydroFIA™ pH is trusted to deliver precise results for diverse applications, including: ● eference data for unmanned / robotic R multi-sensor floats The Global ‘Ship-Of-Opportunity’ (SOOP) network Calibration free Drift free Measurement cycles of approx. 2 min Low sample and reagent consumption User-friendly reagent cartridges One device for single measurements to autonomous, long-term deployment Second inlet for regular standard measurements Integrated acid flush for regular cleaning during operation TECHNICAL SPECIFICATIONS Detector...