MR. C. E. BRADY (General Electric): I would like to hear some 

 comments on the acceptable compromises or definitions of the re- 

 quirements which appear to be conflicting, namely; durability, 

 reliability, low cost, and limited production. 



MR. G. JAFFE (HO): There is no real conflict between the terms 

 durability, reliability, low cost, and limited production. It is 

 generally recognized that compromises are necessary in order to 

 achieve all of these design goals. However, in the oceanographic 

 application, instruments will be at sea under relatively severe 

 environmental conditions for long periods of time. In addition, 

 the cost of operating instrument platforms (research and survey 

 ships) is very high, and, as a result, "downtime" is expensive. 



In the initial phases of the shipboard program, there will 

 probably not be the opportunity to obtain low cost instrumenta- 

 tion because the emphasis will be on reliability and durability. 

 It is hoped, however, that as more platforms become available, 

 production will increase to a point where the previously obtained 

 reliability and durability can be provided at lower cost. 



DR. RALPH L. ELY, JR. (Research Triangle Institute): Are 

 any in situ O^ analyzers in use? 



MR. J. M. SNODGRASS (SIO): There are none, to my knowledge, 

 in deep sea work. Some are used in shallow water, principally 

 at installations such as Texas Towers. The instruments used 

 are designed on the basis of the Kanwisher-Carritt electrode 

 systems. At present, the difficulties with the Kanwisher-Carritt 

 systems are as follows: (1) The relatively high temperature co- 

 efficient, (2) a substantial pressure coefficient which is sioffi- 

 cient to show the changes due to ocean waves when the instrunnent 

 is installed in shallow water, (3) a tendency to drift with time, and 

 (4) at present, no way has been devised to prevent fouling, when the 

 sensor is left unattended. 



There are, of course, industrial O2 analyzers which are used 

 in the process industry and may be used in open tanks. These may 

 be used in sea water to a limited extent, providing the line between 

 the sensor and the recording equipment is short enough. Com- 

 mercial analyzers of the latter type are available from the Hays 

 Corporation, Michigan City, Indiana. 



MR. VINCE GORDON (Philco Corporation): Regarding picture 



237 



