Why test the cells? The oxygen electrogalvanic cells employed in rebreathes were not developed for this purpose, it is certainly the weak link of the rebreather. According to experts, the rebreathers use the sensors abusively because it is exposed to high pressures, very high humidity, wide temperature range, corrosive agents (salt water / absorbents). It resemble a battery having an intrinsic current ranging between 8 and 13 mV when exposed to ambient air at sea level. By exposing the sensor to high PO2, this milivoltage increases proportionally and linear. Near the end of the useful life (1 year) despite spending the calibration tests made on the surface, it may not be responding more linearly in high milivoltage. The consequence of this, can be sensors that have passed on rebreather standard calibration, but when exposed to elevated PO2, show the display a false low PO2. That is, a diver reads on his handset 1.3 when in reality may be 1.4. The linearity test exposes the sensors to a PO2 of 2.0 ATA. Each pressure (eg 1.0, 1.1, 1.2, 1.3, 1.4 ... to 2.0) is measured milivoltage cell is plotted on a spreadsheet that gives the diagnosis. The linearity test cells is very important and has been recommended by the Rebreather Forum 3, 2012 in Orlando-FL.
Posted on: Wed, 03 Jul 2013 11:33:35 +0000
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