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At 7:48 pm -0700 17/8/00, Paul Braunbehrens wrote: >Chris Elmore wrote: >~ >>Paul, >> As long as the area for exhausting the gas is larger than the >>area feeding the gas you should maintain an ambient pressure around >>the sensor. This would not be the case if the flow was great enough >>that resistance around the exhaust ports caused a back pressure. >>Certainly there may be micro-changes in pressure as you would get >>with any compressible fluid flow but these are not great enough to >>be significant. The sensors aren't designed for use above 1atm and >>by keeping the flow reasonable and using a vented adapter the area >>around the sensor stays at ambient pressure. Unless you're blasting >>gas through the line the error from pressure is negligible. >>C. > >Chris, I'd love to believe you, because it means I can use a cheaper >and smaller setup. However, I hope you don't feel offended by my >asking for more data. This could be serious issue if a mistake is >made. I don't have a variety of sensors and flow meters and >restrictors at my disposal to check this stuff out. I must admit to not having a technical background on O2 sensors, but a practical test I did.... Suunto Oxyspy, 50% stage. more or less full. this has no flow restrictor. Valve just open, reading stabilised at 51.2%, valve 1/2 to 3/4 turn open reading stabilised at 51.2%. So sample size at each was only one measurement, (but I'd like to use my gas for diving.....). I think as long as you are sensible in this sort of design the lack of flow restrictors is not that important. Mike PS I didn't do the fill, so don't blame me it missed..... -- Michael Maibaum 020-8244-4526(Home) 07803-070761 (Mobile) 020-8383-2390 (Work) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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