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Gilles · 20th September 2006, 05:19

Quote: (Originally Posted by lbihler)

Hello,

I observe the same symptoms than Gilles.
I observed it on 2hours + dives on multiple days of diving
I do the first calibration on the boat, with air out of a scuba tank and O2 out of my onboard O2 using a "flow reducer type" calibration kit like most MEG divers I ve seen.
My sensors face definitely got wet after the first dive and I couldn t get a decent pO2 reading (doubting my flushes at the beginning but no, nothing did, I got only a 1.4-1.5 max).
I do not doubt my calibration at all either as I got proper readings with dil flushes at the beginning of 1st dive.
I recalibrate with wet sensors and then no pb.
I noticed that my Mv readings dropped quite a bit over the trip (down to 40-45Mv instead of 45-50), probably because of this oisture on the sensors
I still recalibrated every day of the trip as sensors remained wet and only CCR diver so I was not sure about my cells getting "used" a bit too fast or if it was coming from this moisture or both together.

Laurent

I think I binned a couple sensors too quickly

as a result of the apparent non-linearity when using a dry air mV reading to calculate a wet O2 mVoltage. I now have sensors with about 50 hrs diving time, all of which have a dry to wet mV attentuation, and all have remained perfectly linear when calculating from a wet air mV reading.

. Gotta love

those smileys

.

20th September 2006, 05:19	#36 (permalink)
Gilles Worship the feminine Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Den Haag (Netherlands) Posts: 762	Re: Rudimentry sensor mV monitoring Quote: (Originally Posted by lbihler) Hello, I observe the same symptoms than Gilles. I observed it on 2hours + dives on multiple days of diving I do the first calibration on the boat, with air out of a scuba tank and O2 out of my onboard O2 using a "flow reducer type" calibration kit like most MEG divers I ve seen. My sensors face definitely got wet after the first dive and I couldn t get a decent pO2 reading (doubting my flushes at the beginning but no, nothing did, I got only a 1.4-1.5 max). I do not doubt my calibration at all either as I got proper readings with dil flushes at the beginning of 1st dive. I recalibrate with wet sensors and then no pb. I noticed that my Mv readings dropped quite a bit over the trip (down to 40-45Mv instead of 45-50), probably because of this oisture on the sensors I still recalibrated every day of the trip as sensors remained wet and only CCR diver so I was not sure about my cells getting "used" a bit too fast or if it was coming from this moisture or both together. Laurent I think I binned a couple sensors too quickly as a result of the apparent non-linearity when using a dry air mV reading to calculate a wet O2 mVoltage. I now have sensors with about 50 hrs diving time, all of which have a dry to wet mV attentuation, and all have remained perfectly linear when calculating from a wet air mV reading.. Gotta love those smileys. __________________ Gilles http://www.dirrebreather.com
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