Automatic change to 1.3 mited

juniorvigo

Hi all, My EVO has for descent automatic change at -20 from 0.7 to 1.3 ppO2.Last weekend it didn,t do it, I noticed it some minutes after at -25m and did manual change to 1.3.During ascent everything stay okIt,s this behaivou normal or I have something wrong with my SW ( Latest Trimix Update from AP diving ?Thanks in advance to every bodyJunior

broady

Did you change the auto setpoint switch to 20m after the software upgrade as it's set to 30m as a default value by the factory ?

Just a thought

Graham.

juniorvigo

no, after SW upgrade EVO worked normally, changing from 0.7 to 1.3 at -20 m. I didn,t change any set.

What weare talking about aonly happened once.

Thanhs for replay

Humuhumu

Hi Graham,

is a setpoint of 0.7 at -30M not strange, that means less PpO2 than AIR... Are you sure ? (I change manually...)

Cheers

Humuhumu

__________________
Humuhumu Nukunuku Apua'a

broady

According to page 70 of the AP manual it says:

' NOTE: The switching method is set to AUTO (30m) when shipped from the factory. This is obviously not suitable for all dives and needs to be adjusted to suit individual circumstances.

WARNING! Whether AUTO or MANUAL is selected, it is the diver's responsibility to ensure that high setpoint is selected at depth. Failure to ensure this may result in decompression sickness.'

I have mine on 20 metres and think it would be a better idea if the default value from the factory was 20 - 23 metres for the AUTO switch.

Graham


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Humuhumu

Hi,

I totally agree with you. I switch even earlier, let's say 15 to 20 M, but I would never switch at -30 M...

Cheers

Humuhumu

__________________
Humuhumu Nukunuku Apua'a

PhilSiswick

Why not? On descent, I'm not particularly concerned about PO2 falling, as it's going up as I go deeper. Yes, if I stopped for some reason and didn't intervene, it would fall back to 0.7 (especially if the ADV fires), but that is hardly life-threatening if you are using a normoxic dil.

I was taught on Mod 1 to switch at the bottom. I've not yet arrived on the bottom at a reasonable depth (25+) and had a PO2 lower than about 0.8/0.9 even with the ADV firing.

Cheers,

__________________
Phil (WSKD 0001)

I have always felt that the dive I am on is not nearly important as the dives I plan to be on the rest of my life. Tom Rose, 2007

The person who gets the farthest is generally the one who is willing to do and dare. The sure thing boat never gets far from shore. Charles A. Lindbergh

www.hugsac.org.uk

Humuhumu

Hi,

you're right, but for the moment and with an Inspiration, I'm only certified with air diluent. I think the essential point is to do no dives at -30M with a 0.7 PpO2 ...

Cheers

Humuhumu

__________________
Humuhumu Nukunuku Apua'a

Captain Nemo

Hi there if you hold down the centre button for two seconds, you will override the auto setting, so if putting the backlights on just a brief touch will do.

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Beware of false knowledge; It is more dangerous than ignorance.

PhilSiswick

I agree with that, but as I understand it, there is negligible deco difference between raising the setpoint on the descent, or on arrival at the bottom. You won't take a long time to get from 20 to 30m anyway. So, yes, a dive at 30m (or indeed at 20) should be done at the high setpoint, but I don't see the case for setting the unit to switch automatically at all, as the diver should be fully aware of their PO2 at all times and should therefore notice quickly that it is not at the high setpoint and switch up.

Not a criticism of those who auto switch - just a response to the concern that the factory setting is 30m.

Cheers,

__________________
Phil (WSKD 0001)

I have always felt that the dive I am on is not nearly important as the dives I plan to be on the rest of my life. Tom Rose, 2007

The person who gets the farthest is generally the one who is willing to do and dare. The sure thing boat never gets far from shore. Charles A. Lindbergh

www.hugsac.org.uk