Setpoint auto switch ?

colinicky · 8th March 2006, 12:10

On the new Vision electronics does the set point switch automatically on the way down or up or both ? I've only had mine to 1.9 metres so far !

***Louby Lou*** · 8th March 2006, 12:23

Colin

The automatic setpoin switch is set on the way down at a default depth of 10m, but you can change this.

On ascent, it automatically switches back to low setpoint at 3m, IIRC

HTH

Lou

James · 8th March 2006, 13:12

Quote: (Originally Posted by Louby Lou)

Colin

The automatic setpoin switch is set on the way down at a default depth of 10m, but you can change this.

On ascent, it automatically switches back to low setpoint at 3m, IIRC

HTH

Lou

I think it says in the manual when the O2% reaches 100%. So a setpoint of 1.3 will switch over at 3m, a setpoint of 1.4 will switch over at 4m on ascent. Anyway, you don't get any problems of the solnoid attempting to overcomponsate, making life easier for you!

I wouldn't go back to manual switch point now (although you can force the unit between high and low setpoints).

James.

CCR900 · 13th March 2006, 09:46

When setpoint is set to MANUAL then it will neither switch on the way down or the way up.

When on AUTO it will switch on the way down at the depth you set and at 100% (1.3 at 3m) O2 on the way up. A word of warning if you run high PO2 for deco say 1.50 and the deco is bouncy then don't just trust your HUD. If you go through 5m then it will switch and the HUD green will tell you nothing (rememebr it only flashes when you are below setpoint not above it). It won't kill you (if you have on line deco) but you will end up doing more deco as the PO2 drops over time to 0.70.

Other thing is to set your auto switch at the right depth, too shallow and you will spike.

Rgds

Fil

PS Phi, I am now using the back lungs, sweet, I still havent sorted the OTS manual O2 inject yet.

Jason Blackwell · 13th March 2006, 21:10

Quote: (Originally Posted by CCR900)

A word of warning if you run high PO2 for deco say 1.50 and the deco is bouncy then don't just trust your HUD. If you go through 5m then it will switch and the HUD green will tell you nothing (rememebr it only flashes when you are below setpoint not above it). It won't kill you (if you have on line deco) but you will end up doing more deco as the PO2 drops over time to 0.70.

but shouldn't you be checking your handpiece?

wouldn't you notice the 1.5 then go to 1.4...1.3...1.2...1.1...1.0...0.9....0.8...0.7.... and not hearing the solonoid fire for that length of time?

CCR900 · 13th March 2006, 21:46

Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30.

F

Jason Blackwell · 13th March 2006, 21:59

Quote: (Originally Posted by CCR900)

Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30.

F

I hear what you are saying, but green lights on most rebreathers mean PO2 is OK....deco info is still on another part of the equipment. (I hope)

Bazza · 14th March 2006, 00:13

Fil .... sounds like your still in Classic mode.

The green LED just confirms that the set point is being maintained. The fact someone got bent to snot is simply a problem with not following the computers deco profile. The new units will compensate for the lower PPO2 in the deco profile being presented.

Also the chances of not picking up the fact that the unit has switched to 0.7 because you have broken the 3m sealing causing the switch to initiate is very slim. You will be fighting the unit to stay down at less than 3m.

Anyway who does 3m stops on a CCR ??? ... Far to hard for bugger all gain.

regards Baz

UKSteve · 14th March 2006, 15:06

I'm not familiar with the accident highlighted above with a Vision user getting badly bent. The presumption seems to be that the diver was using deco profile on his Vision Handset. However, if the deco was coming from a separate computer that is not plumbed into the loop's ppO2 then I can see how the autoset point would be an issue if a large wave etc takes you through the switch down threshold....particularly where the majority of the stops are at the shallowest depth.

Going off topic slightly however I had a different problem today on a cold dark dive off Brighton. My VR3 decided the battery voltage was too low when I got in the water and switched to low battery mode - only illuminating when a button was pushed. I flicked the left hand button occasionally during the dive and more often during the ascent to check depth and deco progress. When I got to the last stop I noticed the ppO2 setting was back to 0.7. I switched it back to 1.25 and completed the indicated deco. As deco was only slightly more than as per plan I am sure that it must have been during the ascent that things changed rather than on bottom.

Checked during the deco and was able to repeat the switch down... must try to remember to flick the right button instead under such circumstances!!

Steve

PeteS · 14th March 2006, 20:13

Quote: (Originally Posted by CCR900)

Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30.

F

Several points.

1 It wouldn't matter what set point was being run, nor what actual PPO2 was in the loop. The deco software bases it's calculations on the actual measured, not the desired, set point.

2 If you do a ceiling violation it flashes red led's in the HUD.

3 It also beeps at you.

4 It also has down arrows across the display alternating with, suprise suprise, "DOWN".

Could I suggest that your "belief" is innaccurate? Check section 9.10 of the manual for confirmation.

The only way that the situation you describe could happen is if the diver is using a computer that is not integrated to the loop, and that the Inspiration is doing its job of keeping the set point where it should be.

Or is the story just an Urban Legend?

8th March 2006, 12:10	#1 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 678	Setpoint auto switch ? On the new Vision electronics does the set point switch automatically on the way down or up or both ? I've only had mine to 1.9 metres so far ! __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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8th March 2006, 12:23	#2 (permalink)
*Louby Lou* XLVI WC! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: Roman Corinium! Posts: 1,040	Re: Setpoint auto switch ? Colin The automatic setpoin switch is set on the way down at a default depth of 10m, but you can change this. On ascent, it automatically switches back to low setpoint at 3m, IIRC HTH Lou __________________ Miss Lou x Use of RBW is subject to the Rebreatherworld Terms and Conditions - Please read! Outlaw Divers - Sssh we're diving! You heff vays uff dealink vis zem, oh Miss RBW Admin! - Rob Davie Feb 06
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8th March 2006, 13:12	#3 (permalink)
James New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: May 2005 Location: UK Posts: 59	Re: Setpoint auto switch ? Quote: (Originally Posted by Louby Lou) Colin The automatic setpoin switch is set on the way down at a default depth of 10m, but you can change this. On ascent, it automatically switches back to low setpoint at 3m, IIRC HTH Lou I think it says in the manual when the O2% reaches 100%. So a setpoint of 1.3 will switch over at 3m, a setpoint of 1.4 will switch over at 4m on ascent. Anyway, you don't get any problems of the solnoid attempting to overcomponsate, making life easier for you! I wouldn't go back to manual switch point now (although you can force the unit between high and low setpoints). James.
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13th March 2006, 09:46	#4 (permalink)
CCR900 Custom Title Allowed! Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Inspiration Vision Join Date: Nov 2005 Location: England Posts: 333	Re: Setpoint auto switch ? When setpoint is set to MANUAL then it will neither switch on the way down or the way up. When on AUTO it will switch on the way down at the depth you set and at 100% (1.3 at 3m) O2 on the way up. A word of warning if you run high PO2 for deco say 1.50 and the deco is bouncy then don't just trust your HUD. If you go through 5m then it will switch and the HUD green will tell you nothing (rememebr it only flashes when you are below setpoint not above it). It won't kill you (if you have on line deco) but you will end up doing more deco as the PO2 drops over time to 0.70. Other thing is to set your auto switch at the right depth, too shallow and you will spike. Rgds Fil PS Phi, I am now using the back lungs, sweet, I still havent sorted the OTS manual O2 inject yet.
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13th March 2006, 21:10	#5 (permalink)
Jason Blackwell Bloody Rebreathers! Current Rebreather/s: Inspiration Classic Sport Kiss Optima Dolphin Ray Other Rebreather/s: Not Bought Yet Inspiration Vision Evolution Classic Kiss Dolphin Ray Join Date: Feb 2005 Location: Brisbane, Queensland, AUSTRALIA Posts: 364	Re: Setpoint auto switch ? Quote: (Originally Posted by CCR900) A word of warning if you run high PO2 for deco say 1.50 and the deco is bouncy then don't just trust your HUD. If you go through 5m then it will switch and the HUD green will tell you nothing (rememebr it only flashes when you are below setpoint not above it). It won't kill you (if you have on line deco) but you will end up doing more deco as the PO2 drops over time to 0.70. but shouldn't you be checking your handpiece? wouldn't you notice the 1.5 then go to 1.4...1.3...1.2...1.1...1.0...0.9....0.8...0.7.... and not hearing the solonoid fire for that length of time? __________________ Jason Blackwell TDI Instructor Trainer #1358 Optima...Inspiration/Evolution...KISS...and what is next??? www.divedivedive.com.au OZTeK '09 March 2009 Sydney, Australia www.diveoztek.com.au
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13th March 2006, 21:46	#6 (permalink)
CCR900 Custom Title Allowed! Current Rebreather/s: Ouroboros Other Rebreather/s: Inspiration Classic Inspiration Vision Join Date: Nov 2005 Location: England Posts: 333	Re: Setpoint auto switch ? Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30. F
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13th March 2006, 21:59	#7 (permalink)
Jason Blackwell Bloody Rebreathers! Current Rebreather/s: Inspiration Classic Sport Kiss Optima Dolphin Ray Other Rebreather/s: Not Bought Yet Inspiration Vision Evolution Classic Kiss Dolphin Ray Join Date: Feb 2005 Location: Brisbane, Queensland, AUSTRALIA Posts: 364	Re: Setpoint auto switch ? Quote: (Originally Posted by CCR900) Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30. F I hear what you are saying, but green lights on most rebreathers mean PO2 is OK....deco info is still on another part of the equipment. (I hope) __________________ Jason Blackwell TDI Instructor Trainer #1358 Optima...Inspiration/Evolution...KISS...and what is next??? www.divedivedive.com.au OZTeK '09 March 2009 Sydney, Australia www.diveoztek.com.au
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14th March 2006, 00:13	#8 (permalink)
Bazza New Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution rEvo Other CCR Dolphin Other Rebreather/s: Prism Topaz Sport Kiss Classic Kiss MK 15.X rEvo Other CCR Dolphin Join Date: Feb 2005 Location: Australia Posts: 174	Re: Setpoint auto switch ? Fil .... sounds like your still in Classic mode. The green LED just confirms that the set point is being maintained. The fact someone got bent to snot is simply a problem with not following the computers deco profile. The new units will compensate for the lower PPO2 in the deco profile being presented. Also the chances of not picking up the fact that the unit has switched to 0.7 because you have broken the 3m sealing causing the switch to initiate is very slim. You will be fighting the unit to stay down at less than 3m. Anyway who does 3m stops on a CCR ??? ... Far to hard for bugger all gain. regards Baz
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14th March 2006, 15:06	#9 (permalink)
UKSteve Steve Collard Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: Weymouth, UK Posts: 600	Re: Setpoint auto switch ? I'm not familiar with the accident highlighted above with a Vision user getting badly bent. The presumption seems to be that the diver was using deco profile on his Vision Handset. However, if the deco was coming from a separate computer that is not plumbed into the loop's ppO2 then I can see how the autoset point would be an issue if a large wave etc takes you through the switch down threshold....particularly where the majority of the stops are at the shallowest depth. Going off topic slightly however I had a different problem today on a cold dark dive off Brighton. My VR3 decided the battery voltage was too low when I got in the water and switched to low battery mode - only illuminating when a button was pushed. I flicked the left hand button occasionally during the dive and more often during the ascent to check depth and deco progress. When I got to the last stop I noticed the ppO2 setting was back to 0.7. I switched it back to 1.25 and completed the indicated deco. As deco was only slightly more than as per plan I am sure that it must have been during the ascent that things changed rather than on bottom. Checked during the deco and was able to repeat the switch down... must try to remember to flick the right button instead under such circumstances!! Steve
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14th March 2006, 20:13	#10 (permalink)
PeteS Consent Issued! Current Rebreather/s: Inspiration Classic Inspiration Vision Other Rebreather/s: Join Date: Jun 2005 Location: New Zealand Posts: 539	Re: Setpoint auto switch ? Quote: (Originally Posted by CCR900) Absolutley but it is a temptation to rely on the HUD only. The first casualty of the Vision electronics was badly bent, I believe, from diving green leds when his set point was on 0.70 and not 1.30. F Several points. 1 It wouldn't matter what set point was being run, nor what actual PPO2 was in the loop. The deco software bases it's calculations on the actual measured, not the desired, set point. 2 If you do a ceiling violation it flashes red led's in the HUD. 3 It also beeps at you. 4 It also has down arrows across the display alternating with, suprise suprise, "DOWN". Could I suggest that your "belief" is innaccurate? Check section 9.10 of the manual for confirmation. The only way that the situation you describe could happen is if the diver is using a computer that is not integrated to the loop, and that the Inspiration is doing its job of keeping the set point where it should be. Or is the story just an Urban Legend? __________________ Pete S. http://www.steggle.co.nz Every silver lining has a cloud
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