Is it my computer or my brain that's messed up?

[tparrent]

I was just lookingat my computer dive profile for yesterday's dive and noticed a few oddities.

First, for those of you who think California diving is cold, well, I guess you're wrong. According to my 'puter, the water temp on my second dive started at 87 degrees and, after 2 1/2 minutes at 54 feet, it was still 80!

I knew I should have worn my 3 mm :shakehead

So the computer sat in the sun for awhile. Still, would you expect it to take nearly 10 minutes before adjusting to the true water temp? Bottom temp at 53 feet was actually 59 degrees. I think.

Temperature problems don't bother me. I can feel the temperature in my bones regardless of what the computer says.

What does bother me is the "air time remaining". I was diving a steel 72 with about 2200 psi to start. According to my trusty computer, at 2:15 into the dive, while resting comfortably at 54 feet, I had only 1 to 5 minutes of air left :11: Two minutes later at 30 feet, I supposedly had 16-20 minutes left.

Now I hoover with the best of them but I really don't recall breathing hard or fast ANYTIME during these dives.

Now I was adjusting my BC air a bit when I was on the bottom due to the unfamiliar 7mm I was wearing. Do these computer sample instantaneously or do they average it out. The dive profile is displayed in 15 second interval sso I assume there is some smoothing going on.

The computer is an Oceanic Pro Plus 2

Any thoughts are deeply appreciated

 

[SparticleBrane]

^ An example of why my bottom timer isn't AI.

 

[bradshsi]

I suppose it's possible sitting in the hot sun knocked it's sensor calibrations temporarily out of wack. Or there may be a temperature related defect in the PCB/components. Questions:

Is this the first time it's done this ?

How long was it sitting in the sun ?

Did the computer eventually give you more normal readings or is it still acting strange ?

 

[khacken]

the problem is that the sensors are usually in the water tight housing. Mine is horrible as well. I use a dive watch with the sensor open the the water, the reading is much faster.

 

[tparrent]

Looking back at other dives, I see that there are several where the log tells me I had zero minutes of air left.

Makes you wonder what I was breathing for the remaining 5-8 minutes I was underwater on those dives.

I generally surface with at least 500 psi so I'm not emptying these tanks.

 

[Matsya]

Looking back at other dives, I see that there are several where the log tells me I had zero minutes of air left.

Makes you wonder what I was breathing for the remaining 5-8 minutes I was underwater on those dives.

I generally surface with at least 500 psi so I'm not emptying these tanks.

The zero air time could have an explanation.

The Oceanic Atom (which is the computer that I have)calculates remaining air time based on the end pressure that you have specified,the depth you are at, your rate of consumption and I think the safety stop requirement (I have to check this). When it warns you that you have no air time remaining it actually means you have enough air left in your tank to surface at a normal ascent speed and still end up with the end pressure that you have specified.

 

[radio flyer]

My husband and I both have Oceanic Veo 250's, and when we got his out of the package , brand new, never touched the water, his temperature reading was way off wack. Mine said 84 degrees (about right), and his said 53 degrees (ain't no way no how).

 

[tparrent]

That's an interesting possibility ramsabi - I'll check it out. Doesn't really explain the wild fluctuations but it may be a clue. Thanks

 

[Scuba_Steve]

^ An example of why my bottom timer isn't AI.

lol

Also an fine example of why my brain stays in gear and why I don't use a computer.

That crap will rot your brain to the point you'll have to ask a question in public like this on scubaboard

regards

 

[Quarrior]

I never dive my AI without my SPG, but have been known to dive my SPG without the AI synched.