Vr3 4th cell

Mdemon · 27th June 2005, 20:03

Nice idea Mark! I may try that myself.

There is a 4th way - replace the central tube which holds 5 cells and take the cable from there.

I have the chest 4th cell (it's a DeltaP one, not a Bob IIRC). It's just killed a cell due to all the moisture/condensation build up in it.

Mark Chase · 27th June 2005, 21:07

Quote: (Originally Posted by Pierre Farrugia)

Hello all,

The 4th cell do you calibrate it each time you dive ? Can this be done at home before you leave for the dive? What do you do?

I just calibrate the YBOD and check the VR3 if its right its right if not I calibrate it.

Most of the time its right

ATB

Mark Chase

jhaaja · 28th June 2005, 04:43

I do the same as Mark. I just check the calibration at the same time I calibrate YBOD.

If it is not OK, I suck the loop empty and fill manually with oxygen three times. I calibrate the 4th cell when the CLs are full for the 3rd time. Just follow the instructions from VR3 manual.

I have gotten it quite close to the handset values allthough it react a bit slower. I guess that is because the YBODs own cells are so close to the solenoid. It takes at least one inhale to bring the fresh gas to the 4th cell.

JH
FInland

Phil · 28th June 2005, 11:48

Hi Pierre,

In my case I have shorten the corrugated hose from the Y to the T piece, not sure by how much but it must have been a good 5 to 7 rings. An important aspect of the Y piece is to remove the O'ring on the cell if it has one. If you buy your cells from APD they come without O'ring but from other suppliers they might. If you keep the O'ring, it will make a difference in the pressure between the front and back of the cell. This will make the tracking of PPO2 between the VR3 and INSP controller to go out of sync with time. Had a big debate a few years ago about this when the Y came out. I personnaly do not recalibrate the VR3 for every dive, once every 3-4 weeks works fine for me.

Cheers,

Pierre Farrugia · 1st July 2005, 13:15

While using a 4th cell do you noticed any change in deco obligations as oppopsed without it ?

Barrie Law · 1st July 2005, 15:07

Pierre
I dive with two Vr3's one with the Inspiration interface with the 4th cell controlling the deco the and the other Vr3 working on a set-point.
I find with run-times of around 100 mins they are within a minute or two of each other.
I have to admit I like the 4th cell pp02 reading for peace of mind in the event of the Inspiration electronics going down but it has not happened with my unit and if it did I could stay on the loop with the Vr3's pp02 reading.
With the Inspiration set-point set to say 1.3 I would expect the deco to work out fairly close as that is the set-point for the Vr3 unless you have forget to change to high set-point or have the Vr3's cell improperly calibrated and that should be apparent during your pre-breath.
I would calibrate the Vr3's cell about once a month or before I start a series of deeper dives or if I notice a slight diference in the Vr3's pp02 and the Inspirations a good time to check that is when calibrating the Inspiration electrics and the loop is being flushed with 100% 02 your Vr3 should read 1.0 (100%) then as you breath it down in the prebreath the values should move down together and then back up as the solonoid injects.

Cheers

Mark Chase · 1st July 2005, 15:41

What Barrie said

I dive almost exactly the same set up one VR3 on set point one on cell 1 via the Hud.

ATB

Mark Chase

Mikel-Deko · 1st July 2005, 16:27

[quote=Mark Chase]Hi M8

I mount my VR3 on the YBOD Master hand set. That way when you check the VR3 you check the hand set and vice versa. This also has the advantage that you dont try and de kit whilst still conected to the unit via the cable. Very embarising and posably expensive.

Cable is just wraped arround the cable for the hand set.

ATB

Hi Mark,
I've been reading about hansets getting broken. You don't thing that the extra weight in the hanset can break it?
Thank you
Mikel

Mark Chase · 1st July 2005, 17:17

[quote=Mikel-Deko]

Quote: (Originally Posted by Mark Chase)

Hi M8

I mount my VR3 on the YBOD Master hand set. That way when you check the VR3 you check the hand set and vice versa. This also has the advantage that you dont try and de kit whilst still conected to the unit via the cable. Very embarising and posably expensive.

Cable is just wraped arround the cable for the hand set.

ATB

Hi Mark,
I've been reading about hansets getting broken. You don't thing that the extra weight in the hanset can break it?
Thank you
Mikel

Only if i drop the hand set?? Apart from that I dont see how. I try not to drop my hand sets or my VR3's

Far more damage done trying to get out of the rig whilst still attached to the wrist unit

ATB

Mark Chase

Mark Chase · 1st July 2005, 17:20

Quote: (Originally Posted by Mdemon)

Nice idea Mark! I may try that myself.

I cant take any credit for it I got the idea from Paul R Marks.

ATB

Mark Chase

27th June 2005, 20:03	#11 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,927	Nice idea Mark! I may try that myself. There is a 4th way - replace the central tube which holds 5 cells and take the cable from there. I have the chest 4th cell (it's a DeltaP one, not a Bob IIRC). It's just killed a cell due to all the moisture/condensation build up in it. __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
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27th June 2005, 21:07	#12 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	Quote: (Originally Posted by Pierre Farrugia) Hello all, The 4th cell do you calibrate it each time you dive ? Can this be done at home before you leave for the dive? What do you do? I just calibrate the YBOD and check the VR3 if its right its right if not I calibrate it. Most of the time its right ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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28th June 2005, 04:43	#13 (permalink)
jhaaja Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2005 Location: Finland Posts: 884	I do the same as Mark. I just check the calibration at the same time I calibrate YBOD. If it is not OK, I suck the loop empty and fill manually with oxygen three times. I calibrate the 4th cell when the CLs are full for the 3rd time. Just follow the instructions from VR3 manual. I have gotten it quite close to the handset values allthough it react a bit slower. I guess that is because the YBODs own cells are so close to the solenoid. It takes at least one inhale to bring the fresh gas to the 4th cell. JH FInland
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28th June 2005, 11:48	#14 (permalink)
Phil Custom Title Allowed! Current Rebreather/s: Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon rEvo Other CCR Join Date: May 2005 Location: Geneva-Switzerland Posts: 172	Hi Pierre, In my case I have shorten the corrugated hose from the Y to the T piece, not sure by how much but it must have been a good 5 to 7 rings. An important aspect of the Y piece is to remove the O'ring on the cell if it has one. If you buy your cells from APD they come without O'ring but from other suppliers they might. If you keep the O'ring, it will make a difference in the pressure between the front and back of the cell. This will make the tracking of PPO2 between the VR3 and INSP controller to go out of sync with time. Had a big debate a few years ago about this when the Y came out. I personnaly do not recalibrate the VR3 for every dive, once every 3-4 weeks works fine for me. Cheers, __________________ Phil __________________ CCR/OC Instructor CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com
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1st July 2005, 13:15	#15 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	While using a 4th cell do you noticed any change in deco obligations as oppopsed without it ? __________________ 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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1st July 2005, 15:07	#16 (permalink)
Barrie Law RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 459	vr3 4th cell Pierre I dive with two Vr3's one with the Inspiration interface with the 4th cell controlling the deco the and the other Vr3 working on a set-point. I find with run-times of around 100 mins they are within a minute or two of each other. I have to admit I like the 4th cell pp02 reading for peace of mind in the event of the Inspiration electronics going down but it has not happened with my unit and if it did I could stay on the loop with the Vr3's pp02 reading. With the Inspiration set-point set to say 1.3 I would expect the deco to work out fairly close as that is the set-point for the Vr3 unless you have forget to change to high set-point or have the Vr3's cell improperly calibrated and that should be apparent during your pre-breath. I would calibrate the Vr3's cell about once a month or before I start a series of deeper dives or if I notice a slight diference in the Vr3's pp02 and the Inspirations a good time to check that is when calibrating the Inspiration electrics and the loop is being flushed with 100% 02 your Vr3 should read 1.0 (100%) then as you breath it down in the prebreath the values should move down together and then back up as the solonoid injects. Cheers __________________ Barrie Law Rebreather World Store Supplying the Rebreather World Tel:US +19548403892 Fax:US+19543333792 Tel:EU+442071930496 Fax:EU+442077606344 Mobile+353876880628 Skype:barrielaw Email: barrie@rebreatherworldstore.com
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1st July 2005, 15:41	#17 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	What Barrie said I dive almost exactly the same set up one VR3 on set point one on cell 1 via the Hud. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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1st July 2005, 16:27	#18 (permalink)
Mikel-Deko Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: Basque Country -Sp- Posts: 452	[quote=Mark Chase]Hi M8 I mount my VR3 on the YBOD Master hand set. That way when you check the VR3 you check the hand set and vice versa. This also has the advantage that you dont try and de kit whilst still conected to the unit via the cable. Very embarising and posably expensive. Cable is just wraped arround the cable for the hand set. ATB Hi Mark, I've been reading about hansets getting broken. You don't thing that the extra weight in the hanset can break it? Thank you Mikel
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1st July 2005, 17:17	#19 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	[quote=Mikel-Deko] Quote: (Originally Posted by Mark Chase) Hi M8 I mount my VR3 on the YBOD Master hand set. That way when you check the VR3 you check the hand set and vice versa. This also has the advantage that you dont try and de kit whilst still conected to the unit via the cable. Very embarising and posably expensive. Cable is just wraped arround the cable for the hand set. ATB Hi Mark, I've been reading about hansets getting broken. You don't thing that the extra weight in the hanset can break it? Thank you Mikel Only if i drop the hand set?? Apart from that I dont see how. I try not to drop my hand sets or my VR3's Far more damage done trying to get out of the rig whilst still attached to the wrist unit ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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1st July 2005, 17:20	#20 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,700	Quote: (Originally Posted by Mdemon) Nice idea Mark! I may try that myself. I cant take any credit for it I got the idea from Paul R Marks. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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