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Barrie, In reply to: On Thu, 30 May 1996, Barrie Kovish wrote: > On a slightly different note I believe that the Nemisis Nitrox has some sort > of breathing parameter that measures your air consumption rate. On a > semiclosed constant mass flow unit you might be able to use this to > determine if the flow rate is correct while diving. There are a few > gotcha's like preasure drop with tank cooling. The Uwatec Nitrox has a breathing parameter that is based on the transmitter measuring residual gas pressure in the tank after each breath (or at least after some short period of time 5-6 times a minute). This is of no use on a SCR with fixed flow, except if you are using the override a great deal. The SPG in bar directly translates into maximum minutes of gas available. You just divide the bar value by two for the 7.7 liter fixed flow rate orifice. In an SCR the gas available is not really the rate limiting factor (most of the time and assuming you are not frequently ascending and descending, so venting gas from the system). When the gas cylinder runs out, if you don't realize this you can merrily go on breathing until the pPO2 drops and you black out. No measurement of gas volume in the system alone will prevent this. -ph
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