The Hydrothermal Vent Fluid Temperature and Resistivity sensor measures the temperature, resistivity, and Eh 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. Known as the “Res Probe,” this novel seafloor instrument is designed to go inside the “throats” of high temperature (up to 480°C) black smoker chimneys to measure the resistivity and temperature of the hydrothermal vent fluids. Resistivity is an analogue for chlorinity, measuring the “saltiness” of the vent fluids. Many of the structures at Axial Volcano emit boiling fluids, as reflected by their high temperature and low chlorinity. The white wrapping around the cable prevents overheating of the cable by surrounding hydrothermal fluids, should a change in venting sites occur during the duration of the installation.

(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
Vent Fluid Chloride Concentration TRHPHCC DPS
Vent Fluid Oxidation-Reduction Potential (ORP) TRHPHEH DPS
Resistivity R1 TRHPHR1
Resistivity R2 TRHPHR2
Resistivity R3 TRHPHR3
Vent Fluid Temperature from TRHPH TRHPHTE DPS
Thermocouple Temperature TRHPHVC
Thermistor Temperature TRHPHVS

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
TRHPHA Lilley, UW Vent Temperature & Resistivity

Primary Science Discipline


Research Themes

Access Data

TRHPH on the Data Portal

A temperature-resistivity instrument (analogue for chlorinity) being prepared for installation in the International Vent Field at Axial Seamount during Leg 1 of the VISIONS'14 expedition. Photo Credit: Don Setiawan, University of Washington, V14. Creative Commons License