VR£ 4th cell - permissable tracking error?

Mdemon · 7th June 2005, 14:37

I've installed a 4th cell holder which sits near the T-piece on my Inspo.

I can calibrate it fine, even with the slightly older cell I'm using. However, when I was playing with it at the surface last night, I noticed a -0.05 difference between the handsets and the VR£.

I haven't dived with the link switched on yet, and it did seem to track OK when I tested it on dry land.

Is this normal for this type of setup or should I be adjusting something?

TIA!

Mark Chase · 7th June 2005, 18:55

Quote: (Originally Posted by Mdemon)

I've installed a 4th cell holder which sits near the T-piece on my Inspo.

I can calibrate it fine, even with the slightly older cell I'm using. However, when I was playing with it at the surface last night, I noticed a -0.05 difference between the handsets and the VR£.

I haven't dived with the link switched on yet, and it did seem to track OK when I tested it on dry land.

Is this normal for this type of setup or should I be adjusting something?

TIA!

It takes me 3 -4 flushes to achieve 1.6 at 6m on the unit. It takes the same to calibrate the VR3 using a forth cell. Most of the people claiming to have a problem turned out were just doing the standard insp calibration to set the VR3

However 0.05 is not what I would call a problem. It sounds very familiar to me. I still get this now and my VR3 is plumed directly into cell 1. The VR3 is faster reacting and more sensitive than the YBOD I am told this gives differences in the readings.

I didn’t keep the forth cell for long but when I had it it worked fine using the Y piece type. When running the other VR3 on fixed set point I do the whole dive 0.05 below dynamic set point. The difference over up to 180mins in the water is bugger all really so personally I wouldn’t worry about it.

ATB

Mark Chase

uri · 8th June 2005, 13:44

Quote: (Originally Posted by Mark Chase)

However 0.05 is not what I would call a problem. It sounds very familiar to me. I still get this now and my VR3 is plumed directly into cell 1. The VR3 is faster reacting and more sensitive than the YBOD I am told this gives differences in the readings.

ATB

Mark Chase

Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02.

Rgds

U.

Mdemon · 8th June 2005, 15:34

Quote: (Originally Posted by uri)

Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02.

Rgds

U.

I also find the VR£ to be much slower in reacting. I think this may smooth some of the fluctuations so I'm not too fussed. I will try your check though - would be a good confidence boost...

AndyP · 8th June 2005, 21:53

Hi Mate,

Mine is never "on track" so to speak, I just don't worry much about it, as long as it reads slightly lower than the actual set point. CNS is not a major issue, I rarely get close to 100%.

Andrew

Mdemon · 8th June 2005, 22:00

Cheers Andy. Feeling happier now. Will play with it in anger at the weekend - if I get bent to buggery you'll know why!!!!

Mark Chase · 8th June 2005, 23:24

Quote: (Originally Posted by uri)

Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02.

Rgds

U.

Thats realy odd.

My plummed in VR3 picks up on o2 injection a lot quicker than the YBOD hand sets. My VR3 is mounted on the master hand set so I am looking at both at the same time and when the unit injects the VR3 is the first to twich. This is especialy noticible on the 6m 02 flush.

Maby my one is freeky

ATB

Mark Chase

Mdemon · 9th June 2005, 09:11

Mine is v2 I think and 2 pin. The holder is shoulder mounted and the gas seems to be drawn through two holes by the pressure difference. This may account for some of the delay. However, the refresh rate of the screen also seems much slower than the handsets.

Mark Chase · 9th June 2005, 16:20

My one is the 7 pin and V2.1CXR what ever diferance that makes

ATB

Mark Chase

Mdemon · 10th June 2005, 11:38

Mine is grey and heavy... Does that make a difference?

I was playing with my GCS in the murk last night, and being able to flick your wrist and do a confidence check on the PO2 without searching for handsets was great. Only your HUD would be more convenient...

7th June 2005, 14:37	#1 (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: 1,931	VR£ 4th cell - permissable tracking error? I've installed a 4th cell holder which sits near the T-piece on my Inspo. I can calibrate it fine, even with the slightly older cell I'm using. However, when I was playing with it at the surface last night, I noticed a -0.05 difference between the handsets and the VR£. I haven't dived with the link switched on yet, and it did seem to track OK when I tested it on dry land. Is this normal for this type of setup or should I be adjusting something? TIA! __________________ 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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7th June 2005, 18:55	#2 (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: 2,694	Quote: (Originally Posted by Mdemon) I've installed a 4th cell holder which sits near the T-piece on my Inspo. I can calibrate it fine, even with the slightly older cell I'm using. However, when I was playing with it at the surface last night, I noticed a -0.05 difference between the handsets and the VR£. I haven't dived with the link switched on yet, and it did seem to track OK when I tested it on dry land. Is this normal for this type of setup or should I be adjusting something? TIA! It takes me 3 -4 flushes to achieve 1.6 at 6m on the unit. It takes the same to calibrate the VR3 using a forth cell. Most of the people claiming to have a problem turned out were just doing the standard insp calibration to set the VR3 However 0.05 is not what I would call a problem. It sounds very familiar to me. I still get this now and my VR3 is plumed directly into cell 1. The VR3 is faster reacting and more sensitive than the YBOD I am told this gives differences in the readings. I didn’t keep the forth cell for long but when I had it it worked fine using the Y piece type. When running the other VR3 on fixed set point I do the whole dive 0.05 below dynamic set point. The difference over up to 180mins in the water is bugger all really so personally I wouldn’t worry about it. 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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8th June 2005, 13:44	#3 (permalink)
uri Uri Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Apr 2005 Location: Sandhurst UK Posts: 37	Quote: (Originally Posted by Mark Chase) However 0.05 is not what I would call a problem. It sounds very familiar to me. I still get this now and my VR3 is plumed directly into cell 1. The VR3 is faster reacting and more sensitive than the YBOD I am told this gives differences in the readings. ATB Mark Chase Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02. Rgds U.
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8th June 2005, 15:34	#4 (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: 1,931	Quote: (Originally Posted by uri) Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02. Rgds U. I also find the VR£ to be much slower in reacting. I think this may smooth some of the fluctuations so I'm not too fussed. I will try your check though - would be a good confidence boost... __________________ 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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8th June 2005, 21:53	#5 (permalink)
AndyP Mutter Grumble Groan Moan Current Rebreather/s: Inspiration Classic rEvo Other Rebreather/s: rEvo Join Date: Feb 2005 Location: UK Posts: 93	Hi Mate, Mine is never "on track" so to speak, I just don't worry much about it, as long as it reads slightly lower than the actual set point. CNS is not a major issue, I rarely get close to 100%. Andrew
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8th June 2005, 22:00	#6 (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: 1,931	Cheers Andy. Feeling happier now. Will play with it in anger at the weekend - if I get bent to buggery you'll know why!!!! __________________ 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?"
(Offline)

8th June 2005, 23:24	#7 (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: 2,694	Quote: (Originally Posted by uri) Having played about a bit in this area, I've found the VR3 to be quite slow in responding to pp02 changes. Its readings seem to lag the actuals by a good few seconds. Simple test: Calibrate both YBOD and vr3, disconnect the vr3. Set the pp02 to a known (and different level). Plug the vr3 in and count how long it takes to read the correct pp02. Rgds U. Thats realy odd. My plummed in VR3 picks up on o2 injection a lot quicker than the YBOD hand sets. My VR3 is mounted on the master hand set so I am looking at both at the same time and when the unit injects the VR3 is the first to twich. This is especialy noticible on the 6m 02 flush. Maby my one is freeky 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
(Offline)

9th June 2005, 09:11	#8 (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: 1,931	Mine is v2 I think and 2 pin. The holder is shoulder mounted and the gas seems to be drawn through two holes by the pressure difference. This may account for some of the delay. However, the refresh rate of the screen also seems much slower than the handsets. __________________ 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?"
(Offline)

9th June 2005, 16:20	#9 (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: 2,694	My one is the 7 pin and V2.1CXR what ever diferance that makes 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
(Offline)

10th June 2005, 11:38	#10 (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: 1,931	Mine is grey and heavy... Does that make a difference? I was playing with my GCS in the murk last night, and being able to flick your wrist and do a confidence check on the PO2 without searching for handsets was great. Only your HUD would be more convenient... __________________ 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?"
(Offline)

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