UWATEC Bottom Timer Question

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Maybe it's showing your ascent rate in meters per minute.

Or maybe stuck in the nether world somewhere in between.

I thought an ascent rate indicator in actual feet per minute would be a pretty cool tool.

I didn't pay any attention to it till I decided to compare all the data to my Vyper, all the other data was spot on between the two.

I did try a question to Scubapro through their website as well. Will post that reply if I get one.
 
"During an ascent, the ascent speed is displayed in the lower right corner instead
of the temperature and average depth. The ascent speed is displayed in meters
per minute or feet per minute. As soon as the Digital 330m does not detect an
ascent anymore, temperature and average depth information appear again."

Thats how mine works. Of course mine is metric, & the readout for the ascent rate actually says m/min to the right of the number.

Very mysterious, maybe you have entered the twilight zone.
 
I remember from my paper manual, there's a table that converts the numbers into different ascent speeds at ranges of depth. I've never had the old, non-330m version, so I don't know where I'd get that otherwise. Maybe there's a new revision of the BT that now reads fpm?

I'll check when I get home.

I'm looking at that chart at the moment. Mines a couple of years old now but the numbers on the chart are in meters & feet/minute.
 
Thats how mine works. Of course mine is metric, & the readout for the ascent rate actually says m/min to the right of the number.

Very mysterious, maybe you have entered the twilight zone.

Interesting, my first thought was I could change mine over to metric, but realized that is not an option. Also, I don't know how to convert metric time to hours and minutes :D
 
I have the new 330m digital bottom timer and need help figuring out the ascent rate indicator.

The old model gave the ascent rate as a percent of what it figured was the maximum rate would be for the actual depth.

Scubapros website says the new 330m model gives the ascent rate as a percent, but the manual says it gives the ascent rate in actual feet per minute. It even shows a display picture with 12 fpm shown.

Mine gives the ascent rate as a single digit, either 1,2,3 or 4. Which does not make sense in either of above explainations. I was also doing around 30 fpm while I got these numbers.

I asked the dealer I got it from, searched Scubapros website, and asked other users. I also tried another one, and it did same thing.

Anyone got any ideas?

The other Uwatec instruments all display the ascent rate as factor of depth

the depth (in ATA) divided by the ascent rate is about 0.3 across the board.

Example: for 35 metres (4.5 ata) the ascent rate is 15m/min or a factor of 1:0.3

There are variations in this but only within a small bandwidth.

I don't know if the 330m version works the same way but it would seem logical. That said, I've never used it. Also, at depths deeper than about 110m you're in experimental territory and all bets are off in terms of how you manage your ascent.

R..
 
The other Uwatec instruments all display the ascent rate as factor of depth

the depth (in ATA) divided by the ascent rate is about 0.3 across the board.

Example: for 35 metres (4.5 ata) the ascent rate is 15m/min or a factor of 1:0.3

There are variations in this but only within a small bandwidth.

I don't know if the 330m version works the same way but it would seem logical. That said, I've never used it. Also, at depths deeper than about 110m you're in experimental territory and all bets are off in terms of how you manage your ascent.

R..

I am basically a 4 ata and above diver, and never really paid attention to ascent rate indicators on computers or BT, we always do slow ascents 30fpm or less. I hope I never see 110m, too old for that.

I do think that items I purchase should work as advertised, and thought an ascent indicator that actually gave ascent rate in FPM or mpm would be a pretty neat tool. Though I only bought it as a back up bottom timer.

The 330m manual clearly states it is in fpm or mpm, as Kern pointed out his does just that in mpm, he has metric version. The 330m does look at the ascent rate as a factor of depth to give a too fast ascent warning, indicated by an up pointing arrow (susposed to anyhow), the manual includes a chart to show these various rates per depth.
 

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