Multi channel thermocouple temperature data logger and sensor are used for hydrothermal fluids monitoring (active volcanoes areas). This little video of installation and settings refer to Ricci, T., Finizola, A., Barde-Cabusson, S., Delcher, E., Alparone, S., Gambino, S., & Milluzzo, V. (2015). Hydrothermal fluid flow disruptions evidenced by subsurface changes in heat transfer modality: the La Fossa cone of Vulcano (Italy) case study. Geology, 43(11), 959-962. applied here at Santa Ana volcano in El Salvador, University of El Salvador collaboration with University of La Réunion. 4scienceprod 2023.