High precision, drift free, and calibration free seawater pH measuring instrument

CONTROS HydroFIA ® The pH measuring instrument is a pH navigation measuring instrument designed specifically for measuring seawater and brackish water environments. It is an autonomous pH measurement system, and its optimized design enables high-precision pH measurement without calibration. The instrument can be used independently in the laboratory or integrated into existing measurement systems such as the Volunteer Observation Ship (VOS).

working principle

CONTROS HydroFIA ® The pH meter uses the principle of indicator color change to determine the pH value of water, based on the color change of m-cresol purple indicator with the pH value of the water sample. During each measurement, a small amount of m-cresol purple indicator is injected into the sample, and then the visible absorption spectrum of the indicator is measured using the built-in spectrophotometer of the instrument. The pH value of the sample is determined by the quantitative relationship between the absorption spectrum and the pH value of seawater.

Technical advantages

The use of cresol violet to determine the pH value of seawater is an absolute value measurement method, therefore, CONTROS HydroFIA ® The pH measuring instrument does not require calibration and is suitable for long-term use. In addition, the measuring instrument can also be used to monitor short-term biogeochemical processes.

CONTROS HydroFIA ® The pH measuring instrument has low reagent consumption and only requires minimal maintenance, making it very suitable for unmanned long-term automatic monitoring processes. The instrument adopts a user-friendly design, and once the indicator reagent of the measuring instrument is exhausted, the reagent kit can be easily and quickly replaced. In addition, due to the low sample consumption, CONTROS HydroFIA ® A pH meter can be used to measure the pH value of small volume samples.

Product Features

• No calibration required

• No drift

• The measurement cycle is about 2 minutes

• Low sample consumption, low reagent consumption

• User friendly reagent kit design for easy replacement

• One deployment can work for a long time

• Second injection port for routine standard measurement

• Integrated acid flushing circulation system, which can be regularly cleaned during operation