Moisture in the loop.

**Steve** · 14th July 2005, 00:54

Basically I would like to know why the YBOD is so much wetter than other rebreathers. It is by far the wettest of any of the rebreathers I have used and I can’t really see why. Just about all the rebreathers out there use a mix of plastics and metals in varying ratios so why is the YBOD so much wetter that the rest? What makes it "special"?

***caveseeker7*** · 14th July 2005, 01:33

Drooling owners.

sensor330 · 14th July 2005, 02:24

All rebreathers will produce moisture there is no way around that. I never dove a Meg but I have dove several others and the amount other moisture depends on a variety of things i.e temp on water, amount of time breathing on the Rebreather, divers workload, how well the scrubber insulated, ect...

Scott

ROB DAVIE · 14th July 2005, 02:36

Caveseeker7 said the reason for the moisture in YBOD's is: "Drooling owners"!!!

Drmike · 14th July 2005, 07:39

Quote: (Originally Posted by sensor330)

All rebreathers will produce moisture there is no way around that. I never dove a Meg but I have dove several others and the amount other moisture depends on a variety of things i.e temp on water, amount of time breathing on the Rebreather, divers workload, how well the scrubber insulated, ect...

Scott

To me the key thing is not that they all generate condensation beacuse they all do - the key thing is where its generated.

On a YBOD its in the head and outlet hose so it gets all over the sensors and screws up the readings - in other designs (like the MK15 series) the sensors stay bone dry and much of the moisture is collected by pads. A big plus on long dives for sure.

dave t · 14th July 2005, 08:06

Also because of the hydrophobic membranes none of the moisture is absorbed back into the sofnolime. as the o2 is injected into the head you get a cold gas hitting what is probably the hottest part of the loop.

I hear a lot of people having problems with this moiture but in all honesty as long as you dry the lid after every days diving it should never cause a problem. scince they changed the cell faces from that horrible gold mesh to PTFE I have never had a cell warning (for about 3 years!!) nor have I have had any cell blocking due to moisture. On the other hand if you dont dry the lid after every days diving you will get problems.

its interesting to note on the vision electronics there is much less moisture!!

Dave

Drmike · 14th July 2005, 08:41

Quote: (Originally Posted by dave t)

Also because of the hydrophobic membranes none of the moisture is absorbed back into the sofnolime. as the o2 is injected into the head you get a cold gas hitting what is probably the hottest part of the loop.

I hear a lot of people having problems with this moiture but in all honesty as long as you dry the lid after every days diving it should never cause a problem. scince they changed the cell faces from that horrible gold mesh to PTFE I have never had a cell warning (for about 3 years!!) nor have I have had any cell blocking due to moisture. On the other hand if you dont dry the lid after every days diving you will get problems.

its interesting to note on the vision electronics there is much less moisture!!

Dave

For me I had to dry between dives otherwise it was 100% gauranteed that Id have problems.
Also even starting with a dry head, long dives were a problem with condensation getting on the sensors towards the end of the dives

Why do you think it is that the vision electronics produce less moisture?

dave t · 14th July 2005, 08:54

I think mainly because there is lees exposed metal to act as a heat sink, there is a cover over the sensors which acts like a very crude trap/dam

I insulate heavily the hose that goes from the lid to the inhale tee, this improves thing dramatically.

Drmike · 14th July 2005, 09:04

Quote: (Originally Posted by dave t)

I think mainly because there is lees exposed metal to act as a heat sink, there is a cover over the sensors which acts like a very crude trap/dam

I insulate heavily the hose that goes from the lid to the inhale tee, this improves thing dramatically.

I often wondered if the scrubber inlet tube should be made from metal so that moisture would condesate there instead of elsewhere in the loop.

Did you ever try anything like this? Creating a heatsink in a preffered position?

***Beanie*** · 14th July 2005, 09:15

Quote: (Originally Posted by Drmike)

I often wondered if the scrubber inlet tube should be made from metal so that moisture would condesate there instead of elsewhere in the loop.

Did you ever try anything like this? Creating a heatsink in a preffered position?

nice idea whole metal scrubber can could be good

or metal exhale t peice get the water out and into the exhale lung

nice bit of anodised ali anyone

14th July 2005, 00:54	#1 (permalink)
Steve Ladies bring a plate Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Classic Kiss MK 15.X Home Build Join Date: Feb 2005 Location: Perth - Australia Posts: 1,117	Moisture in the loop. Basically I would like to know why the YBOD is so much wetter than other rebreathers. It is by far the wettest of any of the rebreathers I have used and I can’t really see why. Just about all the rebreathers out there use a mix of plastics and metals in varying ratios so why is the YBOD so much wetter that the rest? What makes it "special"? __________________ WARNING: I contain occasional coarse language, extreme sexual references, nudity, and adult themes, which may offend some people - Usually churchy types.
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14th July 2005, 01:33	#2 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,451	Drooling owners. __________________ Cheers Stefan "Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.!"
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14th July 2005, 02:24	#3 (permalink)
sensor330 Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Join Date: Feb 2005 Location: Victoria, British Columbia, Canada Posts: 583	All rebreathers will produce moisture there is no way around that. I never dove a Meg but I have dove several others and the amount other moisture depends on a variety of things i.e temp on water, amount of time breathing on the Rebreather, divers workload, how well the scrubber insulated, ect... Scott
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14th July 2005, 02:36	#4 (permalink)
ROB DAVIE Administrator Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: HOUSTON, REPUBLIC OF TEJAS Posts: 1,120	Caveseeker7 said the reason for the moisture in YBOD's is: "Drooling owners"!!! __________________ [SIZE=2]"CC Rebreathers will become a viable part of tech diving [U]WHEN PIGS FLY[/U]!!"--GI3[/SIZE]
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14th July 2005, 07:39	#5 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,322	Quote: (Originally Posted by sensor330) All rebreathers will produce moisture there is no way around that. I never dove a Meg but I have dove several others and the amount other moisture depends on a variety of things i.e temp on water, amount of time breathing on the Rebreather, divers workload, how well the scrubber insulated, ect... Scott To me the key thing is not that they all generate condensation beacuse they all do - the key thing is where its generated. On a YBOD its in the head and outlet hose so it gets all over the sensors and screws up the readings - in other designs (like the MK15 series) the sensors stay bone dry and much of the moisture is collected by pads. A big plus on long dives for sure.
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14th July 2005, 08:06	#6 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 654	Also because of the hydrophobic membranes none of the moisture is absorbed back into the sofnolime. as the o2 is injected into the head you get a cold gas hitting what is probably the hottest part of the loop. I hear a lot of people having problems with this moiture but in all honesty as long as you dry the lid after every days diving it should never cause a problem. scince they changed the cell faces from that horrible gold mesh to PTFE I have never had a cell warning (for about 3 years!!) nor have I have had any cell blocking due to moisture. On the other hand if you dont dry the lid after every days diving you will get problems. its interesting to note on the vision electronics there is much less moisture!! Dave
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14th July 2005, 08:41	#7 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,322	Quote: (Originally Posted by dave t) Also because of the hydrophobic membranes none of the moisture is absorbed back into the sofnolime. as the o2 is injected into the head you get a cold gas hitting what is probably the hottest part of the loop. I hear a lot of people having problems with this moiture but in all honesty as long as you dry the lid after every days diving it should never cause a problem. scince they changed the cell faces from that horrible gold mesh to PTFE I have never had a cell warning (for about 3 years!!) nor have I have had any cell blocking due to moisture. On the other hand if you dont dry the lid after every days diving you will get problems. its interesting to note on the vision electronics there is much less moisture!! Dave For me I had to dry between dives otherwise it was 100% gauranteed that Id have problems. Also even starting with a dry head, long dives were a problem with condensation getting on the sensors towards the end of the dives Why do you think it is that the vision electronics produce less moisture?
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14th July 2005, 08:54	#8 (permalink)
dave t Custom Title Allowed! Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss Dolphin Ray Azimuth Home Build Other Rebreather/s: Dolphin Ray Azimuth Home Build Join Date: May 2005 Location: UK Posts: 654	I think mainly because there is lees exposed metal to act as a heat sink, there is a cover over the sensors which acts like a very crude trap/dam I insulate heavily the hose that goes from the lid to the inhale tee, this improves thing dramatically.
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14th July 2005, 09:04	#9 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,322	Quote: (Originally Posted by dave t) I think mainly because there is lees exposed metal to act as a heat sink, there is a cover over the sensors which acts like a very crude trap/dam I insulate heavily the hose that goes from the lid to the inhale tee, this improves thing dramatically. I often wondered if the scrubber inlet tube should be made from metal so that moisture would condesate there instead of elsewhere in the loop. Did you ever try anything like this? Creating a heatsink in a preffered position?
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14th July 2005, 09:15	#10 (permalink)
*Beanie* give a man an inch....... Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Vision Join Date: Jan 2005 Location: In da house! yeah baby! Posts: 3,172	Quote: (Originally Posted by Drmike) I often wondered if the scrubber inlet tube should be made from metal so that moisture would condesate there instead of elsewhere in the loop. Did you ever try anything like this? Creating a heatsink in a preffered position? nice idea whole metal scrubber can could be good or metal exhale t peice get the water out and into the exhale lung nice bit of anodised ali anyone __________________ Beanie Gallery Admin & Library Assistant. www.outlawdivers.org.uk www.beandiving.co.uk www.beanengineering.co.uk
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