CO2 sensor design

vincnt moore · 7th July 2008, 04:34

Things seem to be overly complicated, Your brain knows when theres too much co2, so put some bug ( thats very sensitive ) to co2 in a glass jar and when he stops moving you know whats up! " cave mans point of view"

snicks · 7th July 2008, 18:03

What about ATR sensors?
Only looking at one specific wavenumber should make this feasible. The diamond prism might be a bit too expensive though

Greets
Dirk

rian jordaan · 10th July 2008, 11:59

What about photo recognition of the colour change of the sorb.

onetime · 11th July 2008, 12:54

Quote: (Originally Posted by vincnt moore)

Things seem to be overly complicated, Your brain knows when theres too much co2, so put some bug ( thats very sensitive ) to co2 in a glass jar and when he stops moving you know whats up! " cave mans point of view"

Or a parakeet. ;-)

tele · 14th July 2008, 15:53

Fascinating thread guys! I've always wondered if people were looking for CO2 detection capabilities.

I found sensors like these last night:
Gas Sensors

But I figured there has to be some limitation, moisture or pressure.

In regards to color changing sorb and optically detecting that and feeding an alarm... I think I can see a number of potential failure modes. I had thought about the same thing some time ago.

An office building I worked in had a CO2 sensor on the wall in a meeting room, and when someone mentioned it I immediately thought of re-breathers. It's nice to know the difficulties of implementing the technology used in those HVAC automation sensors on Rebreather's.

AD_ward9 · 14th July 2008, 18:16

Quote: (Originally Posted by tele)

Fascinating thread guys! I've always wondered if people were looking for CO2 detection capabilities.

I found sensors like these last night:
Gas Sensors

But I figured there has to be some limitation, moisture or pressure.
.

We got some in and tested them. They use a heated wire, which does not like moisture, pressure or helium. The power requirements at depth on helium are quite remarkable.

Alex

**jepuskar** · 15th July 2008, 04:38

What happened to Tom Rose's sensor??

**Chett.L** · 2nd September 2008, 01:24

I was thinking about this topic C02 sensor detector and came across this post. It sounds like a few people are working on developing this technology. I wonder if it’s lack of funding or too difficult to develop. As rebreathers seam to get more popular perhaps this will be on the horizon sometime in the near future?

Brad_Horn · 2nd September 2008, 04:06

Quote: (Originally Posted by ChettL)

I was thinking about this topic C02 sensor detector and came across this post. It sounds like a few people are working on developing this technology. I wonder if it’s lack of funding or too difficult to develop. As rebreathers seam to get more popular perhaps this will be on the horizon sometime in the near future?

Chett,

You might want to do some reading of the O.R. Sports thread (s) or have a gander @ Deep Life Ltd: Specialists in life critical system design, you can currently buy a 'commercial' off the shelf rebreather with CO2 loop detection for diver & surface supervisor via umbilical, IIRC they had this on show working @ DEMA 07.

They will have a recreational set of electronics that you can buy for EURO 995 @ DEMA 08 (22 Oct) to go on a US$995 mCCR.

So the near future ain't exactly that far away!

Don't know of any other rebreather companies currently looking at supplying a CO2 sensor, though they may be keeping the release quiet for commercial benefit @ DEMA?
Will be interesting how soon an aftermarket company figures out how to adapt a fitting to insert the O.R.Sports monitor into another rebreathers loop, would be one hell of an upgrade to a Mk15.5 for a fraction of the units cost.

Regards
Brad

**Chett.L** · 2nd September 2008, 20:50

Quote: (Originally Posted by Brad_Horn)

Chett,

You might want to do some reading of the O.R. Sports thread (s) or have a gander @ Deep Life Ltd: Specialists in life critical system design, you can currently buy a 'commercial' off the shelf rebreather with CO2 loop detection for diver & surface supervisor via umbilical, IIRC they had this on show working @ DEMA 07.

They will have a recreational set of electronics that you can buy for EURO 995 @ DEMA 08 (22 Oct) to go on a US$995 mCCR.

So the near future ain't exactly that far away!

Don't know of any other rebreather companies currently looking at supplying a CO2 sensor, though they may be keeping the release quiet for commercial benefit @ DEMA?
Will be interesting how soon an aftermarket company figures out how to adapt a fitting to insert the O.R.Sports monitor into another rebreathers loop, would be one hell of an upgrade to a Mk15.5 for a fraction of the units cost.

Regards
Brad

Hi Brad, Thank you for telling me that The Deep Life, Open Revolution will have some type of C02 sensor detector. This will be interesting to see how this works in this unit. I know that the biggest hurdle to tackle with a C02 sensor is water.

7th July 2008, 04:34	#21 (permalink)
vincnt moore RBW Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Apr 2007 Location: Philadelphia Pa. Posts: 84	Re: CO2 sensor design Things seem to be overly complicated, Your brain knows when theres too much co2, so put some bug ( thats very sensitive ) to co2 in a glass jar and when he stops moving you know whats up! " cave mans point of view"
(Offline)

7th July 2008, 18:03	#22 (permalink)
snicks RBW Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Jul 2006 Location: Germany Posts: 44	Re: CO2 sensor design What about ATR sensors? Only looking at one specific wavenumber should make this feasible. The diamond prism might be a bit too expensive though Greets Dirk __________________ Weltmacht mit drei Buchstaben? ICH!
(Offline)

10th July 2008, 11:59	#23 (permalink)
rian jordaan New Member Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Nov 2007 Location: RSA Posts: 6	Re: CO2 sensor design What about photo recognition of the colour change of the sorb.
(Offline)

11th July 2008, 12:54	#24 (permalink)
onetime Classic KISSer #138 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: San Antonio, TX Posts: 684	Re: CO2 sensor design Quote: (Originally Posted by vincnt moore) Things seem to be overly complicated, Your brain knows when theres too much co2, so put some bug ( thats very sensitive ) to co2 in a glass jar and when he stops moving you know whats up! " cave mans point of view" Or a parakeet. ;-) Last edited by onetime : 11th July 2008 at 12:57.
(Offline)

14th July 2008, 15:53	#25 (permalink)
tele RBW Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Aug 2007 Location: Norfolk, VA Posts: 34	Re: CO2 sensor design Fascinating thread guys! I've always wondered if people were looking for CO2 detection capabilities. I found sensors like these last night: Gas Sensors But I figured there has to be some limitation, moisture or pressure. In regards to color changing sorb and optically detecting that and feeding an alarm... I think I can see a number of potential failure modes. I had thought about the same thing some time ago. An office building I worked in had a CO2 sensor on the wall in a meeting room, and when someone mentioned it I immediately thought of re-breathers. It's nice to know the difficulties of implementing the technology used in those HVAC automation sensors on Rebreather's.
(Offline)

14th July 2008, 18:16	#26 (permalink)
AD_ward9 RBW Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 2,011	Re: CO2 sensor design Quote: (Originally Posted by tele) Fascinating thread guys! I've always wondered if people were looking for CO2 detection capabilities. I found sensors like these last night: Gas Sensors But I figured there has to be some limitation, moisture or pressure. . We got some in and tested them. They use a heated wire, which does not like moisture, pressure or helium. The power requirements at depth on helium are quite remarkable. Alex
(Offline)

15th July 2008, 04:38	#27 (permalink)
jepuskar NA Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Chicago, IL Posts: 397	Re: CO2 sensor design What happened to Tom Rose's sensor??
(Offline)

2nd September 2008, 01:24	#28 (permalink)
Chett.L Supporting Member Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: May 2007 Location: LOS ANGELES Posts: 407	Re: CO2 sensor design I was thinking about this topic C02 sensor detector and came across this post. It sounds like a few people are working on developing this technology. I wonder if it’s lack of funding or too difficult to develop. As rebreathers seam to get more popular perhaps this will be on the horizon sometime in the near future? __________________ Chett. L
(Online)

2nd September 2008, 04:06	#29 (permalink)
Brad_Horn Checklist, tick! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic MK 15.X Home Build Join Date: Mar 2005 Location: Australia Posts: 518	Re: CO2 sensor design Quote: (Originally Posted by ChettL) I was thinking about this topic C02 sensor detector and came across this post. It sounds like a few people are working on developing this technology. I wonder if it’s lack of funding or too difficult to develop. As rebreathers seam to get more popular perhaps this will be on the horizon sometime in the near future? Chett, You might want to do some reading of the O.R. Sports thread (s) or have a gander @ Deep Life Ltd: Specialists in life critical system design, you can currently buy a 'commercial' off the shelf rebreather with CO2 loop detection for diver & surface supervisor via umbilical, IIRC they had this on show working @ DEMA 07. They will have a recreational set of electronics that you can buy for EURO 995 @ DEMA 08 (22 Oct) to go on a US$995 mCCR. So the near future ain't exactly that far away! Don't know of any other rebreather companies currently looking at supplying a CO2 sensor, though they may be keeping the release quiet for commercial benefit @ DEMA? Will be interesting how soon an aftermarket company figures out how to adapt a fitting to insert the O.R.Sports monitor into another rebreathers loop, would be one hell of an upgrade to a Mk15.5 for a fraction of the units cost. Regards Brad
(Online)

2nd September 2008, 20:50	#30 (permalink)
Chett.L Supporting Member Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: May 2007 Location: LOS ANGELES Posts: 407	Re: CO2 sensor design Quote: (Originally Posted by Brad_Horn) Chett, You might want to do some reading of the O.R. Sports thread (s) or have a gander @ Deep Life Ltd: Specialists in life critical system design, you can currently buy a 'commercial' off the shelf rebreather with CO2 loop detection for diver & surface supervisor via umbilical, IIRC they had this on show working @ DEMA 07. They will have a recreational set of electronics that you can buy for EURO 995 @ DEMA 08 (22 Oct) to go on a US$995 mCCR. So the near future ain't exactly that far away! Don't know of any other rebreather companies currently looking at supplying a CO2 sensor, though they may be keeping the release quiet for commercial benefit @ DEMA? Will be interesting how soon an aftermarket company figures out how to adapt a fitting to insert the O.R.Sports monitor into another rebreathers loop, would be one hell of an upgrade to a Mk15.5 for a fraction of the units cost. Regards Brad Hi Brad, Thank you for telling me that The Deep Life, Open Revolution will have some type of C02 sensor detector. This will be interesting to see how this works in this unit. I know that the biggest hurdle to tackle with a C02 sensor is water. __________________ Chett. L
(Online)

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