Figure F9. Photographs of temperature logging systems. A. Comparison of three autonomous temperature logger designs. Top: conventional Antares logger, with thermistor in tip on left (time constant of 5–10 s), generally used for short-term deployment (not deployed with CORKs). Middle: “hardened” Antares logger, developed for long-term deployment in subseafloor observatories, with thicker pressure case, double O-ring seal, and additional battery power. Bottom: “hardened” Onset logger, with thermistor located on left side of photograph (time constant of 1–2 min). The latter two kinds of loggers were used on Expedition 327 CORKs. B. Perforated hydraulic hosing being spliced to Spectra cable. Temperature logger is placed inside hosing, which is wrapped in tape, to help protect the logger from damage or loss during deployment and recovery. C. Loggers being deployed on Spectra cable.
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