The Hydrothermal Vent Fluid In-situ Chemistry sensor measures the chemical composition of the mineral-rich fluid plumes that emanate from cracks on the seafloor, providing insight into the sub-surface structure and dynamics of these unique habitats. Specifically, it measures hydrothermal vent fluid temperature, hydrogen, hydrogen sulfide, and pH. The sensor wand design is a ceramic membrane electrode in conjunction with several reference electrodes, constructed with a titanium tube for long-term deployment applications. The instrument utilizes the power supply and bandwidth of the Cabled Array electro-optical cable to conduct continuous monitoring of the hot vent fluids.

(text and images courtesy of Interactive Oceans)

Data Products

This instrument measures the following data products. Select a data product's name to learn more.

Data Product Code DPS
Hydrogen Concentration THSPHHC
Hydrogen Sulfide Concentration THSPHHS
Vent Fluid Temperature from THSPH THSPHTE DPS

The algorithm code used to generate data products for this instrument is also available in the ion-functions GitHub repository.

Instrument Models & Deployed Locations

The OOI includes the following instrument makes and models for this instrument type. Follow the links below to find out where in the OOI this instrument has been deployed. You'll also find quick links for each instrument to Data portal, where you can plot and access data.

Class-Series Make Model
THSPHA Kang/Seyfried, U Minnesota Vent Chemistry Instrument (H2, H2S, pH)

Primary Science Discipline


Research Themes

Access Data

THSPH on the Data Portal