The Touzil Project is a continuos effort to understand better O2
drop in pSCR diving and to develop better and safer pSCR
diving technology.
O2 drop theory is paramount in the safety of pSCR diving, as
the mechanics of rebreather diving affect gases properties.
Furthermore the diver breathing efficiency and the "real"
rebreather ratio plays key role in the true O2 drop.
O2 drop therefore is not a in "general situation" but a personal
calculation, even if divers are using the same machine and/or
same diver using different units.
The O2 drop, in the Touzil Project data is been monitor and
recorded using the latest montioring technology, we use the
VR3 and Liquivison X1 devices.
In the following picture you can see how effective is the record
given from this devices up to intervals of 1 second, purple line
resembles the K factor, in early phases of development of Touzil
drop in pSCR diving and to develop better and safer pSCR
diving technology.
O2 drop theory is paramount in the safety of pSCR diving, as
the mechanics of rebreather diving affect gases properties.
Furthermore the diver breathing efficiency and the "real"
rebreather ratio plays key role in the true O2 drop.
O2 drop therefore is not a in "general situation" but a personal
calculation, even if divers are using the same machine and/or
same diver using different units.
The O2 drop, in the Touzil Project data is been monitor and
recorded using the latest montioring technology, we use the
VR3 and Liquivison X1 devices.
In the following picture you can see how effective is the record
given from this devices up to intervals of 1 second, purple line
resembles the K factor, in early phases of development of Touzil
Touzil Project
 | |  | |  | |  | |  | |  | |  | |  | |  | |  | |  |
One can quickly realize that the diver efficiency affect directly
the "K" factor in the formula and calculations.
Same as for the unit real dump ratio or Rv in the units.
Obviously the VO2 will make the biggest of all changes, but
so the diver and Unit efficiency.
We conduct test dives in different units and with different
users. End up with the conclusion that a "K" factor for each
leg of the dive must be calculated, descent, bottom, and
ascent, also by each diver and unit as a combination.
PO2 drop has two main direct effects on diving safety:
-Hipoxia,
Divers thinks he has a good Mix and he is not, this could
happen even if using an ok OC Mix, just using a different unit,
dump ratio or due to the stress of the dive. In other words the
Minimum Operating Depth of the mixes fluctuate upon "K"
factor and Rv
-DCS,
The PO2 and FO2 of the gas fluctuates accordingly, NDL's
could be time reduced. Furthermore the diver will miss to do
required decompression if times not adjusted to the true Mix.
pSCR divers should always know what's the expected PO2
will be, Touzill testing have been within one centecimal of
predictions, once all parameters have been check, you can
run all mixes and scenarios during planning phase of the
dives.Know your personal Min Operating depths and O2 drop
expectations to adjust for decompression.
You need to figure out your K factor, rb efficiency and then
reading with a PO2 guage on three phases of the dive,
descent, bottom and ascent.
Here you can download pdf's generated by the Touzil System:
Touzil "K" Factor Check
Touzil "Rv" Efficiency Check
Touzil "O2 Drop" Simulator
Go to Touzil Project web site
Manual for O2 sensor connection to Liquivision X1
the "K" factor in the formula and calculations.
Same as for the unit real dump ratio or Rv in the units.
Obviously the VO2 will make the biggest of all changes, but
so the diver and Unit efficiency.
We conduct test dives in different units and with different
users. End up with the conclusion that a "K" factor for each
leg of the dive must be calculated, descent, bottom, and
ascent, also by each diver and unit as a combination.
PO2 drop has two main direct effects on diving safety:
-Hipoxia,
Divers thinks he has a good Mix and he is not, this could
happen even if using an ok OC Mix, just using a different unit,
dump ratio or due to the stress of the dive. In other words the
Minimum Operating Depth of the mixes fluctuate upon "K"
factor and Rv
-DCS,
The PO2 and FO2 of the gas fluctuates accordingly, NDL's
could be time reduced. Furthermore the diver will miss to do
required decompression if times not adjusted to the true Mix.
pSCR divers should always know what's the expected PO2
will be, Touzill testing have been within one centecimal of
predictions, once all parameters have been check, you can
run all mixes and scenarios during planning phase of the
dives.Know your personal Min Operating depths and O2 drop
expectations to adjust for decompression.
You need to figure out your K factor, rb efficiency and then
reading with a PO2 guage on three phases of the dive,
descent, bottom and ascent.
Here you can download pdf's generated by the Touzil System:
Touzil "K" Factor Check
Touzil "Rv" Efficiency Check
Touzil "O2 Drop" Simulator
Go to Touzil Project web site
Manual for O2 sensor connection to Liquivision X1
One of Touzil test divers and
software developer Leonardo Zillo
getting ready for a test dive.
software developer Leonardo Zillo
getting ready for a test dive.
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