DEEP SEA PLANKTON SAMPLER 
Sketches 
(To be provided) 
Primary Uses 
This is an instrument designed for "underway" operations from an 
oceanographic survey ship at moderate speeds. Its purpose is to 
permit quantitative sampling of a variety of sizes of plankton, at 
selected depths. 
Requirements and Specifications: 
ae To be designed for "underway" operation and to perform reliably 
at ship speeds of 0-15 knots and at operating depths of 0 to 6,000 feet. 
b. Net opening to be adjusted prior to lowering in water. 
c. Net to be designed so as to be opened and/or closed on signal 
from the ship. 
d. Net screen (mesh) size must be capable of being adjusted re- 
motely from the ship, with an end view of achieving a minimum of 
six (6) screen changes per cast. 
e. Water volume flow through net to be measured to an accuracy 
of +1 percent. 
f. This instrument should provide for attaching standard modular 
temperature and depth sensors to the net frame to measure and continu- 
ously transmit this data to a recorder topside. The characteristics of 
such standard sensors should be: 
(1) Depth Sensors 
0-6,000 feet; +4% of full range 
Time response: 95% response to a step function of 6 feet 
in 1 second. 
(2) Temperature: 
=29 to +35; +0.1° 
9) ee 
Time response: 95% response to a step function of 1°Guin 
1 second. 
2S) 
