click for a larger image
High resolution Thermochrons (DS1921Z) are used in the Mediterranean Sea, to monitor the environment of the Mediterranean’s most important endemic plant, the "Posidonia Oceanica", which produces flowers and fruits on very rare occasions. Recent widely spread flowering can, in fact, be related to a temperature increase (average or local) of the sea water.
We have chosen Thermochrons because of their unprecedented ability to read and store data without the need of any external wire. This feature is of basic importance in our application because the temperature must be monitored in the sea, at different depths, not necessarily near the coast. We selected 5-10-15-20-25 msw (meter sub water) as sensing depths. Sensors have been encapsulated inside thermally-conducting, robust metal chassis in order to overcome pressure problems which could damage the devices. Once encapsulated, the sensors are firmly affixed to heavy blocks and later positioned at the selected sites inside small holes. This is to prevent readings affected from sea currents rather than from the real thermal status. Sensors are programmed to sample data every 3 hours (i.e. 8 samples per day), which ensures tracking temperatures for several months. The project aims to correlate temperature variations with the natural behavior of growth of the "Posidonia Oceanica".
This solution has been developed by ElbaTech s.r.l. for Circolo Subacquei Teseo Tesei Coop a.r.l.
Circolo Subacquei Teseo Tesei