From: Quarterdeck Volume 5, Number 1, Spring 1997

Conductivity-Temperature-Depth meter (CTD)

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1. As the CTD descends, water passes through electronic conductivity and temperature cells behind this protective plate. Also behind the plate, a small pressure sensor records the changing depth of the instrument.

2. A small pump pulls seawater through the conductivity and temperature cells then ejects it back into the water column.

3. Air bubbles trapped inside the tube are released through an escape valve.

4. A sturdy pressure case houses a battery to supply power to the instrument, as well as a small computer that collects the data and transmits them to the surface through a conducting cable connected at one end. This unit can also receive data from other instruments, integrate them with CTD data, and relay all the information to the surface or store it internally.

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