O2 sensors - What you DON'T KNOW - FAILURE!

bajaecotours · 5th November 2006, 21:37

I posted an incident with my O2 sensors failing some time back. I just now received a hard copy of the sensor failure report from Teledyne....and thought I'd share it with the comunity. It's fairly straight forward and has DEFINATELY made me more aware of checking out my sensors before diving or diving or installing them.

Attachments include:
1. my original O2 sensor failure report to Teledyne
2. teledyne's analysis and conclusion of the failure

Joe · 5th November 2006, 22:13

Very interesting....thanks for sharing.

Quote: (Originally Posted by bajaecotours)

I posted an incident with my O2 sensors failing some time back. I just now received a hard copy of the sensor failure report from Teledyne....and thought I'd share it with the comunity. It's fairly straight forward and has DEFINATELY made me more aware of checking out my sensors before diving or diving or installing them.

Attachments include:
1. my original O2 sensor failure report to Teledyne
2. teledyne's analysis and conclusion of the failure

cys · 5th November 2006, 22:24

Thanks for sharing. The teledyne recommendation is to use a machined polyethylene cell body rather than injection molded cell for the R22D to reduce cracking. Anyone know if a machined cell is currently available?

Barrie Law · 5th November 2006, 22:28

ERR are there many of the cell type that failed out there??

Very interesting attachments, thanks for posting.

Regards

narked at 90 · 5th November 2006, 22:42

I've had cell failures from new cells. maybe we start a list of cell failures so we can Analise the figures our selfs, as this seems to be a major unknown with the systems we use

cell type r22. etc
manufacture date
failure date
symptoms of failure
mv if avaiable

any other info we need any one?
kind regards john routley
Welcome Page

hrdubwd · 6th November 2006, 00:11

Quote: (Originally Posted by bajaecotours)

I posted an incident with my O2 sensors failing some time back.

A question: do I read your report correctly, the sensors are part of the loop seal in the Meg? This would seem to mean that they carry a pressure difference across them (hydrostatic head due to CL bottom being below cells). I am surprised that the membrane could take that as a matter of routine, but it does seem to indicate a set of extra internal failure points. But, how can these be part of the seal when the p.c.b. would be exposed to sea water?

For the record, I have had 1 Teledyne R22-D d.o.a., no apparent cause. 1 APD 'Buddy' dead in 3 mo., 1 Buddy leaked - I blew 'condensation' off the membrane, and the immediate sting in my eye prompted to me to jump over the side and wash it out p.d.q. - be aware, this stuff is nasty. Another dead one. Teledyne K1-D - useless, all < 6 mo.

BWD

bendomatic · 6th November 2006, 00:21

Quote: (Originally Posted by narked at 90)

I've had cell failures from new cells. maybe we start a list of cell failures so we can Analise the figures our selfs, as this seems to be a major unknown with the systems we use

cell type r22. etc
manufacture date
failure date
symptoms of failure
mv if avaiable

any other info we need any one?
kind regards john routley
Welcome Page

K1D
12/05
10/06
failed upon opening from packaging. 2 others from same batch, opened at same time, ok. wouldn't calibrate in air - max reading .16
mv low (don't know exact)

Gene_Hobbs · 6th November 2006, 02:42

Thank you for the post!

Rubicon Research Repository
Evaluation of Analytical Industries Inc. Model Number PSR-11-33-NM Oxygen Sensors for Use With the MK 16 MOD 1 Underwater Breathing Apparatus
Rubicon Repository ID#: 123456789/3536

Unmanned Test and Evaluation of the Teledyne Analytical Instruments R-10DN Oxygen Sensor for Use in the MK 16 Mod 1 Underwater Breathing Apparatus
Rubicon Repository ID#: 123456789/3466

We have more like these on hand but lack of funds and time will be a limiting fcactor on when we can get to them. There are also reviews of failures in most evaluations done on different systems (Several in the Repository already).

Slightly off topic but interesting on recording of O2 sensor data.
DESIGN OF AN UNDERWATER TELEMETRIC SYSTEM FOR REBREATHERS
Rubicon Repository ID#: 123456789/3715
abstract

DonalWalsh · 6th November 2006, 22:39

Is this why I can't get a R22D for love nor money at the moment???

dteubner · 7th November 2006, 10:26

Quote: (Originally Posted by DonalWalsh)

Is this why I can't get a R22D for love nor money at the moment???

If you follow the link in this thread - http://www.rebreatherworld.com/spons...r-blowout.html they are even on sale!

Dave T

5th November 2006, 22:13	#2 (permalink)
Joe Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2005 Location: Florida, USA Posts: 248	Re: O2 sensors - What you DON'T KNOW - FAILURE! Very interesting....thanks for sharing. Quote: (Originally Posted by bajaecotours) I posted an incident with my O2 sensors failing some time back. I just now received a hard copy of the sensor failure report from Teledyne....and thought I'd share it with the comunity. It's fairly straight forward and has DEFINATELY made me more aware of checking out my sensors before diving or diving or installing them. Attachments include: 1. my original O2 sensor failure report to Teledyne 2. teledyne's analysis and conclusion of the failure
(Offline)

5th November 2006, 22:24	#3 (permalink)
cys ck #157 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Feb 2005 Location: S. California Posts: 201	Re: O2 sensors - What you DON'T KNOW - FAILURE! Thanks for sharing. The teledyne recommendation is to use a machined polyethylene cell body rather than injection molded cell for the R22D to reduce cracking. Anyone know if a machined cell is currently available?
(Online)

5th November 2006, 22:28	#4 (permalink)
Barrie Law RebreatherWorld Sponsor Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Ireland Posts: 726	Re: O2 sensors - What you DON'T KNOW - FAILURE! ERR are there many of the cell type that failed out there?? Very interesting attachments, thanks for posting. Regards __________________ 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
(Offline)

5th November 2006, 22:42	#5 (permalink)
narked at 90 In my own little world Current Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Classic Kiss Other CCR Dolphin Home Build Join Date: Feb 2005 Location: middlands uk Posts: 1,010	Re: O2 sensors - What you DON'T KNOW - FAILURE! I've had cell failures from new cells. maybe we start a list of cell failures so we can Analise the figures our selfs, as this seems to be a major unknown with the systems we use cell type r22. etc manufacture date failure date symptoms of failure mv if avaiable any other info we need any one? kind regards john routley Welcome Page __________________ CHECK OUT OUR INTERWEBS FOR CUSTOM REBREATHER UPGRADES *WWW.NARKEDAT90.CO.UK* *WWW.GRPSERVICES.COM*
(Offline)

6th November 2006, 00:11	#6 (permalink)
hrdubwd New Member Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Nov 2005 Posts: 86	Re: O2 sensors - What you DON'T KNOW - FAILURE! Quote: (Originally Posted by bajaecotours) I posted an incident with my O2 sensors failing some time back. A question: do I read your report correctly, the sensors are part of the loop seal in the Meg? This would seem to mean that they carry a pressure difference across them (hydrostatic head due to CL bottom being below cells). I am surprised that the membrane could take that as a matter of routine, but it does seem to indicate a set of extra internal failure points. But, how can these be part of the seal when the p.c.b. would be exposed to sea water? For the record, I have had 1 Teledyne R22-D d.o.a., no apparent cause. 1 APD 'Buddy' dead in 3 mo., 1 Buddy leaked - I blew 'condensation' off the membrane, and the immediate sting in my eye prompted to me to jump over the side and wash it out p.d.q. - be aware, this stuff is nasty. Another dead one. Teledyne K1-D - useless, all < 6 mo. BWD
(Offline)

6th November 2006, 00:21	#7 (permalink)
bendomatic Morgan's Mum Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2005 Location: Brisbane Australia Posts: 201	Re: O2 sensors - What you DON'T KNOW - FAILURE! Quote: (Originally Posted by narked at 90) I've had cell failures from new cells. maybe we start a list of cell failures so we can Analise the figures our selfs, as this seems to be a major unknown with the systems we use cell type r22. etc manufacture date failure date symptoms of failure mv if avaiable any other info we need any one? kind regards john routley Welcome Page K1D 12/05 10/06 failed upon opening from packaging. 2 others from same batch, opened at same time, ok. wouldn't calibrate in air - max reading .16 mv low (don't know exact) __________________ why deal with idiots on the net when you have to spend all day dealing with them at work.
(Offline)

6th November 2006, 02:42	#8 (permalink)
Gene_Hobbs Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Sep 2006 Location: Durham, NC, USA Posts: 118	Rubicon Research Repository Thank you for the post! Rubicon Research Repository Evaluation of Analytical Industries Inc. Model Number PSR-11-33-NM Oxygen Sensors for Use With the MK 16 MOD 1 Underwater Breathing Apparatus Rubicon Repository ID#: 123456789/3536 Unmanned Test and Evaluation of the Teledyne Analytical Instruments R-10DN Oxygen Sensor for Use in the MK 16 Mod 1 Underwater Breathing Apparatus Rubicon Repository ID#: 123456789/3466 We have more like these on hand but lack of funds and time will be a limiting fcactor on when we can get to them. There are also reviews of failures in most evaluations done on different systems (Several in the Repository already). Slightly off topic but interesting on recording of O2 sensor data. DESIGN OF AN UNDERWATER TELEMETRIC SYSTEM FOR REBREATHERS Rubicon Repository ID#: 123456789/3715 abstract __________________ http://rubicon-foundation.org/ Home of the Rubicon Research Repository. For help getting started with the Repository, please visit our FAQ page. PLEASE support our work. "Oxygen is addictive and deadly. Everyone who uses it will eventually die" --RW Hamilton, PhD 1991
(Offline)

6th November 2006, 22:39	#9 (permalink)
DonalWalsh Third Class Snorkeller Current Rebreather/s: Megalodon Other Rebreather/s: Evolution Join Date: Nov 2005 Location: Moving to London in Sept.....which way to the South Coast?? Posts: 136	Re: O2 sensors - What you DON'T KNOW - FAILURE! Is this why I can't get a R22D for love nor money at the moment???
(Offline)

7th November 2006, 10:26	#10 (permalink)
dteubner Pedant Current Rebreather/s: Sport Kiss Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Adelaide, Australia Posts: 216	Re: O2 sensors - What you DON'T KNOW - FAILURE! Quote: (Originally Posted by DonalWalsh) Is this why I can't get a R22D for love nor money at the moment??? If you follow the link in this thread - http://www.rebreatherworld.com/spons...r-blowout.html they are even on sale! Dave T
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