SEA FLOOR GEOTHERMAL PROBE 
Sketches 
(To be provided) 
Primary Use: 
To be utilized on oceanographic survey ships, with the ship stopped 
("lying-to"), to measure the heat-flow characteristics and values 
across and within the sea floor sediments. 
Requirements and Specifications: 
a. To be utilized during stopped ("lying-to") operations. 
b. To perform reliably and accurately in water depths of O to 6,500 
fathoms. 
c. Instrument should be simple in design and construction, rugged, 
and easy to transfer from one ship to another for re-installation. 
Modular sensors could be attached to the long and short sediment corers 
of the Sea Floor Sampling System. 
d. Data to be measureds 
Data Range Accuracy 
Heat Flow 0 to 10 micro cal/em*/sec +0.05 micro cal/ 
cm2/sec 
Temperature gradi- 0 to 0.6°C/meter +0.001°C/meter 
ent 
Temperature Oto 5°C (Ontom0nreet) +0.001°C 
0 to 10°C (0 to 100 feet) +0.001°C 
Depth of probe O to 20 feet +0.1 foot (or measured 
(corer)in sea O to 100 feet mechanically or visual- 
floor ly on core barrel) 
e. Data Recording and Readouts 
Data to be displayed and recorded on Master Shipboard Data Logging 
and Processing System; or, if more practicable, recorded internally at the 
probe. 
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