[PSUBS-MAILIST] scrubber performance

[hank pronk via Personal_Submersibles]

Hi All,Today I did some extensive scrubber testing.  Gamma has 3 axial scrubbers, one is Gamma'a original scrubber from 1971 with a smaller quiet fan.  The next one is a home made scrubber made the same as Gamma's original, the third is a re-breather scrubber with a computer fan.Interestingly after reading through some information Cliff sent me, I learned that the flow rate is critical.  The only way I can change that is to fill the scrubber canister more or less.  I started with 3\4 full canisters and a full re-breather canister and had a CO2 level of 950 PPM.  With all three canisters full I had a CO2 level of 1133 PPM.  So clearly the flow rate makes a big difference.  Now I understand why Gamma's original scrubber had such a big fan, in order for the canister to be full, the fan needs to be quite powerful.I also have a true appreciation of how well the altimeter indicates how well the O2 level and CO2 level are monitored.If the Altimeter was off zero even the tiniest bit, it correlated with the instruments perfectly.  Hank
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