Strange behaviour

[Przemek]

Hello,

Today I did 100m with my ostc. Everything went ok on the way back till 33m. Then suddenly my comp told me to make deepstop for 1min. This 1min last around 5min and nothing changed. My partner had the same comp, same gases and same settings and he hadn't this deepstop. After we decided to go up, after 4 m my ostc changed to normal further deepstop but showed me twice longer TTS (59m) than my partner had. On 10m ostc told to make another strange stop 10m/1min. it was unexpected and again last aorund 4 min. When I moved to 9m i changed to 9m/1min, and TTS shorten to normal TTS (29m) and rest of deco went OK. I really dont understand behaviour of my ostc and it makes me fill worry for furher dives. Why this happend? Had anyone such situation?

PS my friend today made 160m and had two OSTC. Both went blank od 150m.

[swissdiving]

First to your PS

Max oparating depth is 120m and the pressure sensore works to 14bar. If you go beyond 120m the OSTC has a shutdown programmed in the FW.
It actually helps to read the manual first!

To be able to say anything about the deco stop issue you would have to let us know how the OSTC was configured? Did you configure a gas change at that depth?

What FW version are you using?

[Przemek]

thanks for the reply.

Is the sensor broken or just shut down? For now both comps are black and cannot be turn on. We cannot even download anything thru the PC.


As for my strange behaviour. I didnt configure to swith comps on those depth. I used oxy,nx50, tmx 21/35 as deco gases. Today I was on 80m and again my comp stopped me on 33m for 1 min and it last for 4 min. As I went up few meters everything back to normal and further deco stops were calculated correctly.

[swissdiving]

Hmmm...

If you went well below 120m it could be that you broke the pressure sensor. Its only designed to work to 14bar 130m.

I am not quite sure what happens once the OSTC was shut down, I would have thought it would work again once you brought it back up to the surface.
When you plug it in at the USB do you have any little lights flashing in the center at the bottom of the screen?
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There would be two. Blue while in Desat mode and the orange one if the OSTC is being charged.


I am sure Matthias can say more to that.

That "strange" behavour can occure when you set a gas change at a specific depth. The OSTC expects you to change the gas and tells you that you configured for a gas change. Once you go past that depth it contiues to calculate on the gas that is in use.

Also what FW version are you running on the OSTC?

[sailor]

Hi,

regarding your own computer, make sure to switch CF55 ( gas switch in minutes ) to "0".
The described behaviour happens if CF55 is set >0, there's a better gas configured and active and you are not switching the OSTc to that better gas on the configured depth.
Check your friends OSTC, most propably CF55 ist set to "0".
The reason is the OSTC just waits for that gas switch.

Reiner

[Clownfish]

Note that later computers do not have the blinking lights, at least mine does not.