More safe with Gradient Factor

[extra260]

Hallo.

Sorry for my question, I try to understand in the manual, but I cannot... :S

I have OSTC N2 with default gradient factor to 90% e 110% .
To be more safe what I must change ??

Foe example 80-100 or 100-120 ??

Sorry foe my english too.

Thank you to all

Gabriele

[sailor]

Hello,

you are mentioning the second value only which is around 90.
GF consists of two values.
80 is way to high for the first value.
The GF default setting is something like 30/90.
Higher values are more "unsafe", lower values are more "safe".

Before changing the GF setting make sure to get more information and fully understand it.
Without fully understanding GF leave the computer on default or use Buehlmann.
A wrong GF setting can be very dangerous pending on your kind of diving.
There's plenty information about GF in the net.
You eventually should ask for support by an Trimix instructor.


Reiner

[extra260]

Ok, thank you very much.

i'll try to find something

Thank you again

[Bardass]

if you use 90/110, you are not using GRADIENT FACTORS !!

you are using the standard Bulhmann algorithm with two conservatisme parameters, CF11 and CF12.

For Buhlmann + GF algorithm, you have to use CF32 and CF33

[extra260]

I use decotype : zh-l16 oc


The mistake is here !!

I must use l16-gf oc, right?

So with :

cf 32: 30
Cf 33: 90

So, for more safety 40-100 is ok ??

Thank you

[extra260]

I use decotype : zh-l16 oc

And the mistake is here !!

I must use l16-gf oc, right ??

So, with:

cf 32: 30
Cf 33: 90

So, for more safety 40-100 is ok ??

Thank you

[Bardass]

It depends
If you are diving with mix Air or Nitrox, you CAN use standard Buhlmann with default parameters 110/90 or 120/90 to get more conservatism.
You can use too Buhlmann + GF with 60/80 but don´t use 30/90

If you use trimix mix, you have to use GF algorithm.
But you will be trained to understand and to use GF

[sailor]

Hi,

40/100 is less safe then 30/90.
If you want a safer GF you have to use 20/80 or so.

From my Point of view 60/80 is not recommendable for trimix.
It might be ok for air or nitrox.

Reiner

[Bardass]

i said
"If you are diving with mix Air or Nitrox, you can use GF60/80
if you use Trimix, you will be trained ...""

[swissdiving]

As this has been discussed several times in this Forum there is a Search Function...
http://forum.heinrichsweikamp.com/read.php?2,3344,3591#msg-3591

When using GF it is highly recommended to undestand them.
Erik Baker M-Values

[stefanoaquilante]

sorry for my english. i've a question. I've bought an OSTC3, and i use gradient factors low at 30% and high at 90%. i use this parameters for trimix dives (normossic TMX. ean 40 and O2) and i think is a good balance for my safety.
Then, when i make a recreational dive this parameters are very restricives (a lot of deco time instead of other normal PC set up).
May i switch - off the gradient factors of my OSTC3 for recreational diving?

Thanks

Stefano

[jb2cool]

What kind of dive profile gives you excessive deco? I run 30/85 on an OSTC mk2 and an happy with the deco that's planned.

[Bardass]

i run with GF80/85 for Air and Air+Nitrox dives until 60m
and GF50/80 for trimix dives until 80m

[kaheksa]

And here I am with my 20/85 for every dive...

[ClaudeDive]

I use for Air and Air + NX and or O2> GF 81/82 (very close to the decompression of commercial computers, Galileo, Vyper settled RGBM50% ...)
[left][/left]
For Tx Normoxic I usually use> GF 40/80,
[left][/left]
For Tx Hypoxic, if you do not know, you shouldn't tinker, a good Tx training with a course will be a crucial prerequisite, (tu)
[left][/left]
For info. the original copy of an excellent article (rarely quoted, what a pity!) To start your GF knowledge,
[left][/left]
http://www.diverite.com/education/rebreather/tips/gradient%20factors/
[left][/left]
Regards
[left][/left]

[scubatinoo]

I've read that 15/85 up to 60m gives similar deco like Vplanners vpm-b... So it's interesting to read that everyone uses different GF's for the same kind of dive... And it's working for all of them.