[PSUBS-MAILIST] Depth Sounder Transducer Project

[Jon Wallace via Personal_Submersibles]

PSUBS will be investing $333 into R&D of depth sounding transducers for use with small personal submarines.  There are two primary uses for such equipment on our vessels, the first is to provide depth readings from the surface to locate suitable diving locations within the diving range of that particular vessel.  The second is to provide depth readings indicating when the vessel is approaching the bottom which is useful when visibility is poor.
Transducer functional requirements for this project are:    A) capable of reliable depth sounding to at least 1000 feet    B) capable of surviving submergence to 2000 feet.
Cliff Redus will be performing the testing for the organization.  The plan is to pressure test a stock off-the-shelf NMEA-0183 transducer unit starting at 80 psi, then increasing pressure at regular intervals until a maximum of 890 psi is reached.  The intent is to determine maximum depth survival of an off-the-shelf unit since there is no such data available from the manufacturer.
If the unit fails during testing a post-test analysis will be performed to determine where the failure occurred, and how it might be corrected.  If the unit survives the testing it will be sold and the investment returned to the organization.
Cliff will provide a test report to the group with his findings and recommendations.  
Jon
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