PpO2 spikes at depth

Pierre Farrugia · 20th August 2006, 18:23

Hello all,

Yesterday while diving a wreck @ 60m, set point 1.3 and using 13/37 dil (if you are asking about this strange mix.....that was the only helium available at my dive centre...not that bad

) Calib was ok, decent ok and for first 10min of dive ok, then while ascending from a hold I hear alarm, look at display and was 1.6 1.6 1.7......ohhh shi.....but then descended quickly, like a spike, this happened about 3 times and when I was considering bail out, then everything to normal! During deco I had a low battery , could this be the cause ? I also checked oxygen interstage pressure and was spot on! Anyone had same problem? Today dived unit again no problems!

jhaaja · 20th August 2006, 18:36

Never seen so big spikes. Did it spike almoust immediately after the solenoid fired?

JH

Pierre Farrugia · 20th August 2006, 18:38

Quote: (Originally Posted by jhaaja)

Never seen so big spikes. Did it spike almoust immediately after the solenoid fired?

JH

First time I am not sure but then yes

, then when you breath will start dropping again!

***EBT*** · 20th August 2006, 19:08

Have you checked the IP on your O2 first stage...

Dutchy · 20th August 2006, 20:28

Quote: (Originally Posted by EBT)

Have you checked the IP on your O2 first stage...

He did. He says it's spot on...

jhaaja · 21st August 2006, 09:50

Quote: (Originally Posted by Pierre Farrugia)

First time I am not sure but then yes

, then when you breath will start dropping again!

The beeb is most probably from one cell being slower in reaction. You will get a cell warning insted of high ppO2 warning. I would not be to concerned, because the o2 is injected allmoust straight to the censors. All I can say your censors seem to be working and reacting fast

JH

20th August 2006, 18:23	#1 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	PpO2 spikes at depth Hello all, Yesterday while diving a wreck @ 60m, set point 1.3 and using 13/37 dil (if you are asking about this strange mix.....that was the only helium available at my dive centre...not that bad ) Calib was ok, decent ok and for first 10min of dive ok, then while ascending from a hold I hear alarm, look at display and was 1.6 1.6 1.7......ohhh shi.....but then descended quickly, like a spike, this happened about 3 times and when I was considering bail out, then everything to normal! During deco I had a low battery , could this be the cause ? I also checked oxygen interstage pressure and was spot on! Anyone had same problem? Today dived unit again no problems! __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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20th August 2006, 18:36	#2 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 885	Re: PpO2 spikes at depth Never seen so big spikes. Did it spike almoust immediately after the solenoid fired? JH
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20th August 2006, 18:38	#3 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Re: PpO2 spikes at depth Quote: (Originally Posted by jhaaja) Never seen so big spikes. Did it spike almoust immediately after the solenoid fired? JH First time I am not sure but then yes , then when you breath will start dropping again! __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
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20th August 2006, 19:08	#4 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 2,057	Re: PpO2 spikes at depth Have you checked the IP on your O2 first stage... __________________ Eagles May Soar, but weasels don't get sucked into jet engines! RBW Terms of service
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20th August 2006, 20:28	#5 (permalink)
Dutchy Rene Warries Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2006 Location: Nieuwegein (The Netherlands) Posts: 837	Re: PpO2 spikes at depth Quote: (Originally Posted by EBT) Have you checked the IP on your O2 first stage... He did. He says it's spot on... __________________ = This post is environmentally friendly. It is composed of 100% recycled electrons only. =
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21st August 2006, 09:50	#6 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 885	Re: PpO2 spikes at depth Quote: (Originally Posted by Pierre Farrugia) First time I am not sure but then yes , then when you breath will start dropping again! The beeb is most probably from one cell being slower in reaction. You will get a cell warning insted of high ppO2 warning. I would not be to concerned, because the o2 is injected allmoust straight to the censors. All I can say your censors seem to be working and reacting fast JH
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