O2 sat reading on i200 computer?

[jlsea]

Hello,

Looking for others who might have experience using Aqua Lung computers for Nitrox diving?

I use an i200 computer and on two of my recent dives with Nitrox, I've noticed "O2 sat" readings of 99 in the dive log, after the dives. For other recent and similar dives, this reading has ranged between 17 and 20 (including for dives that were deeper and lasted longer than the ones where 99 was recorded). I've consulted the computer manual to make sense of this difference, but I haven't found a reasonable explanation. The manual claims a warning/alarm goes off for O2 sat of 80 or more, but I did not observe this on the dives that have later recorded an O2 sat of 99.

I've included the relevant details from the computer for recent dives (all 24h or more apart):

It doesn't seem that the readings of 99 could be accurate if they're a) so much greater than the more consistent 17-20 readings and b) exactly 99 in both cases.
I'm wondering if some condition/threshold hasn't been hit for the dives with readings of 99, but the condition/threshold has been hit for the other dives with readings of 17-20? Maybe the readings of 99 are actually O2 minutes instead of O2 saturation?

I appreciate any insight anyone might be able to share! (In the meantime, I've also contacted Aqua Lung for support).

Thank you!

 

[tursiops]

Hello,

Looking for others who might have experience using Aqua Lung computers for Nitrox diving?

I use an i200 computer and on two of my recent dives with Nitrox, I've noticed "O2 sat" readings of 99 in the dive log, after the dives. For other recent and similar dives, this reading has ranged between 17 and 20 (including for dives that were deeper and lasted longer than the ones where 99 was recorded). I've consulted the computer manual to make sense of this difference, but I haven't found a reasonable explanation. The manual claims a warning/alarm goes off for O2 sat of 80 or more, but I did not observe this on the dives that have later recorded an O2 sat of 99.

I've included the relevant details from the computer for recent dives (all 24h or more apart):
View attachment 799877

It doesn't seem that the readings of 99 could be accurate if they're a) so much greater than the more consistent 17-20 readings and b) exactly 99 in both cases.
I'm wondering if some condition/threshold hasn't been hit for the dives with readings of 99, but the condition/threshold has been hit for the other dives with readings of 17-20? Maybe the readings of 99 are actually O2 minutes instead of O2 saturation?

I appreciate any insight anyone might be able to share! (In the meantime, I've also contacted Aqua Lung for support).

Thank you!

Did you go into deco on any of the dives?

 

[jlsea]

No, no deco. Proceeding as normal with the safety stop.

 

[Garrett424]

I just noticed the same thing happened on my dive log. Dive was to 64 feet at lasted 55 minutes. Gas 33%, PO2 was .97. No deco. Did you hear anything back from Aqua Lung or otherwise figure out the answer to this?

 

[rongoodman]

What does that even mean in this context? I’m pretty sure your dive computer doesn’t know your O2 sats. If it did, with those numbers you’d be very dead.

 

[jlsea]

I just noticed the same thing happened on my dive log. Dive was to 64 feet at lasted 55 minutes. Gas 33%, PO2 was .97. No deco. Did you hear anything back from Aqua Lung or otherwise figure out the answer to this?

Just to clarify, your log also reads an "O2 sat" of 99 after that dive? I did get a rather unhelpful response from Aqua Lung (below), where they implied it's an error -- but no further information or tangible support to get a replacement from the retailer. I no longer live in the same country as the shop I bought mine from (in early 2019), so I guess I'm SOL.

"We're to hear about your experience with your computer.

Please note that for safety reasons, your device should be examined by a specialist.

Did you purchase it from our site?
If so, please provide us with your order number.

If you bought it from a reseller, please contact them so that they can repair or exchange it for a new one.

We hope you find this answer helpful and wish you a good day."

 

[Garrett424]

Correct. I interpreted it as a clear error since it was my only dive that day, but I was concerned that it was operator error on my part. Now I'm wondering if there is a defect in the computer since I am well outside any warranty period. If the defect is confined to the o2 sat in the log then I don't really care, but if there is an underlying processing defect that would be more significant.

Thank you for the response!

 

[jlsea]

Yeah, I had the same concerns re: opeartor error and I guess that's why we both ended up here looking for answers. The erroneous value has been logged on multiple occasions for me, but no related alarms during the actual dives. I'd also love to know if it's just the O2 sat entry or a systemic/processing error!

Cheers!