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silent running · 12th September 2006, 21:45

Quote: (Originally Posted by sabgia)

Since then, I've been calibrating end of dive day, rather than before the beginning! At start of day, Air is .24-.25 and O2 is ~1.1, but I do get a very comforting 1.6 at end of dive

(@6m O2 reverse flush).

Hello sabagia, in my experince with the Prism reading in air higher than .21 means you don't have 100% O2, maybe more like 97%. 100% O2 is sometimes hard to get and fill whips which have not been purged of air, can bring the % down further. Which of course makes me wonder what's in that other 3%...

And another thing, aren't O2 sensors for use in the high humidity, high PO2 environment of a CCR supposed to be able to cope with this? I have not found any difference in my sensor readings before a dive-dry-, during or after, with high humidity in the loop. -Andy

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12th September 2006, 21:45	#25 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,814	Re: Rudimentry sensor mV monitoring Quote: (Originally Posted by sabgia) Since then, I've been calibrating end of dive day, rather than before the beginning! At start of day, Air is .24-.25 and O2 is ~1.1, but I do get a very comforting 1.6 at end of dive (@6m O2 reverse flush). Hello sabagia, in my experince with the Prism reading in air higher than .21 means you don't have 100% O2, maybe more like 97%. 100% O2 is sometimes hard to get and fill whips which have not been purged of air, can bring the % down further. Which of course makes me wonder what's in that other 3%... And another thing, aren't O2 sensors for use in the high humidity, high PO2 environment of a CCR supposed to be able to cope with this? I have not found any difference in my sensor readings before a dive-dry-, during or after, with high humidity in the loop. -Andy .
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