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Jim, Most manufacturers built in a temp compensation circuit in their analysers. This makes most analysers unaffected by temp fluctuations. However, most calibrations are done at amient temp and the gas coming from the cylinder is usually lower due to gas expansion. In the NS Research Gas Blender Manual it talks about "typical sensor output at 0degC is 98% the signal at 20degC" so if "the oxygen pp is 0.4 and the analyser is reading 40% at 20degC, at 0degC it would be reading 39.2%" So that might be a point. Regards, THOMAS At 08:54 PM 4/9/99 -0500, you wrote: >At 07:55 PM 4/8/99 -0400, Jim Cobb wrote: >>I don't know about you guys but I think the problem we are dealing with >>here is the temperature of the mix rather than stratification. As the mix >>cools off the reading becomes more accurate. > >God Jim I hope not! > If that were true Jim, then we should wait until tanks (Gas and all) >reached room temp before we analyzed. What does this do to my mix when its >in 50 degree water or colder? Does this mean I have to throw the >temperature into the calculations of my deco tables to allow for >thermoclines and such? >I always thought a "hot mix" was more O2 than the desired percentage. >Let me ask you again, Do different gases in a mix (while still a bit warm) >show false analysis because of heat or Stratifacation? >I'm going to try an experiment...I just put a burner under one of my O2 >bottles to see how much the O2% drops. >Uh its up to about 120 degrees now. Let me check it...be back soon > > >"SILT HAPPENS"JD JEFF DISLER > SAFE CAVING NSS 26000 > > <bold><italic><fontfamily><param>Eurostile</param><color><p aram>8080,0000,0000</param>SILENT IMMERSION, Inc. Caracasbaaiweg 276 Curacao, Netherlands Antilles Tel/Fax: 599-9-767.70.14 Cell.: 599-9-562.13.23 www.silentimmersion.com </color></fontfamily></italic></bold> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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