VR3 TX question

sensor330 · 25th June 2007, 04:27

I'm planning a deep dive and I going to 17/46 as a dil down to 240'. Yeah I know the PO2 will be high but I plan on breathing down the mix to maintain a SP of 1.2. My question is if I have my VR3 set to 1.1 will the computer compute my deco using the 1.1 or 1.40 which is the actual PO2 of the dil at that depth.

Scott

Mixaddict · 25th June 2007, 04:32

Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR.

sensor330 · 25th June 2007, 04:48

Quote: (Originally Posted by Mixaddict)

Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR.

That's what I thought.
Thanks

colinicky · 25th June 2007, 06:40

Quote: (Originally Posted by Mixaddict)

Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR.

Would this still be true if you used a 4th cell for a real time reading ?

sensor330 · 25th June 2007, 15:08

Quote: (Originally Posted by colinicky)

Would this still be true if you used a 4th cell for a real time reading ?

No. At least I don't think so.

gbmay · 25th June 2007, 22:56

If you have it on CCR mode and using the "4th cell" the VR3 will read the actual P02 at a given depth. If you want to set the P02 you can turn off the 02 sensor and it will use whatever fixed P02 you select.

Juz · 26th June 2007, 12:39

Just out of interest, why not use a dil that gives you a lower PPO2 at the target depth - perhaps 12% O2 or even going for 10/52 (Heliair)?

Juz

sensor330 · 26th June 2007, 14:47

Quote: (Originally Posted by Juz)

Just out of interest, why not use a dil that gives you a lower PPO2 at the target depth - perhaps 12% O2 or even going for 10/52 (Heliair)?

Juz

That's what I normally do. Was going to try something a bit different.

Sutty · 26th June 2007, 19:13

Quote: (Originally Posted by Mixaddict)

Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR.

You can see this happen if you set up the VR3 for fixed setpoint eg 0.7 at the surface and descend - once you are below the depth where the PO2 of the dil exceeds 0.7 it will display the PO2 of the dil, and I presume calculates the deco for that too. Not much of a problem on MCCR, although if you forget to switch up the VR3's PO2 it will give you more deco than needed. Could be more of a problem if you forgot to change up an ECCR's setpoint at the same time - the VR3 would calculate deco at the PO2 of the dil, but the ECCR would hold low setpoint, and the VR3 would indicate less deco than required!

I can't see how I could forget to raise my actual PO2 on a Kiss so I'm not terribly worried about the effect for me!

Neil

College Diver · 26th July 2007, 04:20

Is yours a color model, and if so was it worth the added cost?

I am in the market to buy a VR3 in the next few weeks - currently I am only using OC - but CCR is on the agenda. I chose the VR3 because of it's reputation and ability to upgrade - a computer that I won't outgrow.

Are the monochrome displays really that hard to read (ie necessitating the color upgrade)

thanks

25th June 2007, 04:27	#1 (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: 585	VR3 TX question I'm planning a deep dive and I going to 17/46 as a dil down to 240'. Yeah I know the PO2 will be high but I plan on breathing down the mix to maintain a SP of 1.2. My question is if I have my VR3 set to 1.1 will the computer compute my deco using the 1.1 or 1.40 which is the actual PO2 of the dil at that depth. Scott Last edited by sensor330 : 25th June 2007 at 04:30.
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25th June 2007, 04:32	#2 (permalink)
Mixaddict Always Learning! Current Rebreather/s: Inspiration Vision Evolution Other CCR Dolphin Other Rebreather/s: Inspiration Classic Other CCR Dolphin Join Date: Jan 2006 Location: Draper, Utah USA Posts: 476	Re: VR3 TX question Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR. __________________ Randy Thornton (MixAddict) Inspiration, Evolution,Hammerhead & Sentinel CCR Instructor
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25th June 2007, 04:48	#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: 585	Re: VR3 TX question Quote: (Originally Posted by Mixaddict) Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR. That's what I thought. Thanks
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25th June 2007, 06:40	#4 (permalink)
colinicky Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 667	Re: VR3 TX question Quote: (Originally Posted by Mixaddict) Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR. Would this still be true if you used a 4th cell for a real time reading ? __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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25th June 2007, 15:08	#5 (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: 585	Re: VR3 TX question Quote: (Originally Posted by colinicky) Would this still be true if you used a 4th cell for a real time reading ? No. At least I don't think so.
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25th June 2007, 22:56	#6 (permalink)
gbmay New Member Current Rebreather/s: Inspiration Classic Pelagian Dolphin Azimuth Other Rebreather/s: Pelagian Dolphin Azimuth Join Date: Jun 2005 Location: Philippines Posts: 18	Re: VR3 TX question If you have it on CCR mode and using the "4th cell" the VR3 will read the actual P02 at a given depth. If you want to set the P02 you can turn off the 02 sensor and it will use whatever fixed P02 you select.
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26th June 2007, 12:39	#7 (permalink)
Juz Team Kinky Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: London UK Posts: 147	Re: VR3 TX question Just out of interest, why not use a dil that gives you a lower PPO2 at the target depth - perhaps 12% O2 or even going for 10/52 (Heliair)? Juz __________________ ~KINKY DIVERS~ Because going down is fun We are all prompted by the same motives, all deceived by the same fallacies, all animated by hope, obstructed by danger, entangled by desire and seduced by pleasure. Welcome to Kinky Divers!
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26th June 2007, 14:47	#8 (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: 585	Re: VR3 TX question Quote: (Originally Posted by Juz) Just out of interest, why not use a dil that gives you a lower PPO2 at the target depth - perhaps 12% O2 or even going for 10/52 (Heliair)? Juz That's what I normally do. Was going to try something a bit different.
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26th June 2007, 19:13	#9 (permalink)
Sutty Classic Kiss diver Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Jun 2005 Location: Glossop, Derbyshire, UK Posts: 801	Re: VR3 TX question Quote: (Originally Posted by Mixaddict) Once you have selected the appropriate gas on your VR3, it will calculate your deco on whatever the actual PO2 of that selected gas is. It will not understand that you have manually overridden the set point on your CCR. You can see this happen if you set up the VR3 for fixed setpoint eg 0.7 at the surface and descend - once you are below the depth where the PO2 of the dil exceeds 0.7 it will display the PO2 of the dil, and I presume calculates the deco for that too. Not much of a problem on MCCR, although if you forget to switch up the VR3's PO2 it will give you more deco than needed. Could be more of a problem if you forgot to change up an ECCR's setpoint at the same time - the VR3 would calculate deco at the PO2 of the dil, but the ECCR would hold low setpoint, and the VR3 would indicate less deco than required! I can't see how I could forget to raise my actual PO2 on a Kiss so I'm not terribly worried about the effect for me! Neil __________________ Never forget that life is a finite resource.
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26th July 2007, 04:20	#10 (permalink)
College Diver New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jun 2007 Location: Bakersfield, CA; for now Posts: 8	Q for VR3 owners Is yours a color model, and if so was it worth the added cost? I am in the market to buy a VR3 in the next few weeks - currently I am only using OC - but CCR is on the agenda. I chose the VR3 because of it's reputation and ability to upgrade - a computer that I won't outgrow. Are the monochrome displays really that hard to read (ie necessitating the color upgrade) thanks __________________ Alan C PADI DMC
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