Neil Brown Instrument Systems Mark III Conductivity, Temperature, Depth (CTD)
Date1980s
Object number00055791
NameInstrument
MediumMetal
DimensionsOverall: 620 × 360 × 165 mm
Copyright© CSIRO
ClassificationsTools and equipment
Credit LineAustralian National Maritime Museum Collection Gift of CSIRO
DescriptionThe Conductivity, Temperature and Depth instrument (CTD) instrument is used to gather a range of ocean data including salinity, density and sound velocity. The CTD is further used to collect samples for gas analysis and phytoplankton samples. If oceans are seen as the world lungs, and the currents veins moving nutrients around, the CTD is the instrument used in order to monitor blood pressure.HistoryThe Conductivity, Temperature and Depth instrument (CTD) instrument is used to gather a range of ocean data including salinity, density and sound velocity. Extra sensors can also be added to the CTD to measure other variables such as phytoplankton, oxygen fluorescence and turbidity.
A conventional CTD setup includes a frame/carousel, CTD instrument, various auxiliary sensors and water sample bottles (Niskin Bottles) that allow water to be collected for later analysis. The CTD can be deployed over the side of a vessel to depths of up to 10,000 m. During its ascent to the water surface, the bottles on the CTD can be closed at predetermined depths, allowing scientists to collect water samples at regular intervals throughout the water column.
SignificanceThe Conductivity, Temperature and Depth instrument (CTD) is deployed to great effect in monitoring the health of the world’s oceans. The CTD has the ability to gather a range of ocean data including salinity, density and sound velocity. It is further capable of collecting samples for gas analysis and phytoplankton samples. A conventional CTD setup allows for the incorporation of other equipment, such as a 24-36 carousel bottle frame, Niskin Bottles, and various auxiliary sensors, resulting in a highly advanced water sampling device.
1950s
from 1950s
1960s
