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Hi John, My understanding of the Bio Marine unit is that it is superior to most closed circuit systems, but still does not have the reliability of the Cis Lunar. It has been out so long that expectations about its performance can be far more realistic than most. >-- The reason for the three sensors is the ability to average the reading, so that if one sensor fails, the unit can discard its reading and average the two with similar readings---hopefully two do not fail, this would discard the one remaining functional sensor and average the two that have failed....A frequent cause of sensor failure is that the sensors get bent from gas not passing quickly enough through the membrane outside from the electrolyte chamber. Water on the face of the sensors will degrade the ability of O2 to pass through the membrane, thus creating false readings. And also, as many people on this list have discussed constantly,( the linearity of sensors on the miniox and equivalents), as they (sensors) degrade they lose the ability to display the top end (this will happen even without any failure). A triple sensor array with an averaging system makes sense because of the high failure rate of sensors. The cis lunar approach of doubling even this is much safer. Given the price range and training parameters of the Bio Marine unit, there is little danger of "techno-weenies" being hurt on it, like other closed circuit systems now coming on the market. Regards, Dan >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > Dan Volker SOUTH FLORIDA DIVE JOURNAL "The Internet magazine for Underwater Photography and mpeg Video" http://www.florida.net/scuba/dive 407-683-3592
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