Difference between MB levels and Gradient Factors

[SeanW]

Hi all!

I was wondering if anyone could explain the difference between MB Levels (found on Scubapro computers) and gradient factors? I have a Scubapro G2 running Buhlman ZHL-16 ADT MB and I'm unsure what the distinction is between the different programmable MB levels (for added conservatism) vs gradient factors (found on computers running non proprietary Buhlman ZHL-16). How do these compare with one another?

 

[scubadada]

Who knows?

 

[BoltSnap]

Hi all!

I was wondering if anyone could explain the difference between MB Levels (found on Scubapro computers) and gradient factors? I have a Scubapro G2 running Buhlman ZHL-16 ADT MB and I'm unsure what the distinction is between the different programmable MB levels (for added conservatism) vs gradient factors (found on computers running non proprietary Buhlman ZHL-16). How do these compare with one another?

I suggest contacting Scubapro's technical support, you can find their email on their website, and ask them about it. They are very helpful and will give you the correct information without guessing from people who don't know.

 

[scubadada]

The proprietary adjustments of the Scubapro algorithm are poorly described and not documented to any acceptable degree. For the new Luna 2.0 they will offer Buhlmann ZH-L16C, a telling change of heart.

 

[Scott]

This thread may provide some insight.

Deco diving with the ZH-L16 MB ADT PDIS from SP G2

SP G2 uses Buhlmann algorithm, it has a combination of MB and PDIS in this case you can choose to activate it or not. From Wikipidia: PDISs are intermediate stops at a depth above the depth at which the leading compartment for the decompression calculation switches from ongassing to...

scubaboard.com

 

[Wibble]

It appears that Scubapro added their own tweaks to the Buhlmann ZHL-16 algorithm.

Nowadays ZHL-16 is most commonly implemented with Gradient Factors; i.e. is a well-known and understood algorithm that matches across brands of computers if diving with others.

Thus that G2 uses Buhlmann but with proprietary tweaks.

The missing TLAs**:

• PDIS (Profile Dependent Intermediate Stop)
• MB (MicroBubbles)

**Three Letter Acronyms (including extended TLAs)

 

[inquis]

• MB (dunno -- will edit if found out)

Micro-bubble

 

[tursiops]

It appears that Scubapro added their own tweaks to the Buhlmann ZHL-16 algorithm.

Nowadays ZHL-16 is most commonly implemented with Gradient Factors; i.e. is a well-known and understood algorithm that matches across brands of computers if diving with others.

Thus that G2 uses Buhlmann but with proprietary tweaks.

The missing TLAs**:

• PDIS (Profile Dependent Intermediate Stop)
• MB (dunno -- will edit if found out)

**Three Letter Acronyms (including extended TLAs)

MB = MicroBubbles

 

[Bigbella]

The proprietary adjustments of the Scubapro algorithm are poorly described and not documented to any acceptable degree. For the new Luna 2.0 they will offer Buhlmann ZH-L16C, a telling change of heart.

Not so -- the adjustments promote both "wellness“ and "goodness" . . .

 

[tursiops]

https://www.divetable.info/skripte/G2_GF.pdf

See slide 4
Approximately:
MB L 0 = GFHi 90
1 85
2 80
3 75
4 70
5 65
6 60
It also implies that GFhi=GFlo if using MB levels.