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AD_ward9 · 9th November 2007, 14:23

I have seen bad batches from both the main suppliers, which can easily account for your problem, but wonder if it is due to shock.

O2 sensors are very fragile. Drop a sensor onto a block of wood from 5ft ten times and it most will not work afterwards. They loose electrolyte, which makes them drift high as well as low. If you see a sensor with a high output, yet the load resistor inside is still intact, then shock is the cause of the failure.

Try pack your Rebreather on its front, not its back. The front has the CLs to protect the electronics and sensors from shock. The shock on RIBs and boats can be very high: look how how RIBs are so good at destroying general SCUBA kit.

Cheers

Alex
'

Quote: (Originally Posted by doug allen)

I searched...(not extensively mind ya'll)...this site about this subject and nothing came up immediately....but I do have a question about O2 sensor life.

Anyway....I've had to replace 4 O2 sensors in my rebreather since July 07....seems everytime I fire this sucker up on dive day I get a "Fail" error on one of the three sensors on the Hammerhead.....3 of them have been replaced under warranty...the other one was a spare that I got with the unit....

Has anyone else experienced early failure of O2 sensors this frequently?

9th November 2007, 14:23	#7 (permalink)
AD_ward9 So much more to learn Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 1,732	Re: O2 sensor failures I have seen bad batches from both the main suppliers, which can easily account for your problem, but wonder if it is due to shock. O2 sensors are very fragile. Drop a sensor onto a block of wood from 5ft ten times and it most will not work afterwards. They loose electrolyte, which makes them drift high as well as low. If you see a sensor with a high output, yet the load resistor inside is still intact, then shock is the cause of the failure. Try pack your Rebreather on its front, not its back. The front has the CLs to protect the electronics and sensors from shock. The shock on RIBs and boats can be very high: look how how RIBs are so good at destroying general SCUBA kit. Cheers Alex ' Quote: (Originally Posted by doug allen) I searched...(not extensively mind ya'll)...this site about this subject and nothing came up immediately....but I do have a question about O2 sensor life. Anyway....I've had to replace 4 O2 sensors in my rebreather since July 07....seems everytime I fire this sucker up on dive day I get a "Fail" error on one of the three sensors on the Hammerhead.....3 of them have been replaced under warranty...the other one was a spare that I got with the unit.... Has anyone else experienced early failure of O2 sensors this frequently?
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