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Old 14th March 2011, 15:35   #1 (permalink)
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SF2 - Rebreather

A new rebreather on the market?

http://www.tdisdi.de/wetnotes-sf2.pdf




Quote:
The market for recycling equipment is currently
clearly in motion. Various
Manufacturers with new and promising
Devices from different
Type on the market. In this category
includes the SF2, a new
electronic rebreather from Germany.
Wetnotes, the device under the
Closer look, and with the people
spoken behind the project.
"Keep it simple!", That was the motto
in the development of SF2.
Even at first glance, it is
that this claim into reality
was implemented. The device acts
of a piece and has a
convincingly simple form. Compared
works with other devices
SF2 very compact. The reason for this
reveals itself on closer
very quickly. The counter lung is
is lower in the tube. The
SF2 can this respect, its origin
not be denied: his predecessor,
the (how surprising) SF1 was a
PSCR. "For several years, were PSCRKreislaufgeräte
the Non Plus Ultra
in the technical diving community, "says
Thomas Friese, the developer
of SF2, the situation in recent years.
It has long dealt with Friese
the development of cardiovascular devices
and accessories. He was instrumental in the
Development of some diving equipment involved
and later produced his own
Device, the aforementioned SF1.
"We were very happy with the performance
of SF1, and in terms of
breathing comfort, but now am
I come to the conclusion that
ECCR device more comfortable and
safer than passive systems working. "
The Tek-scene seems this opinion
to share now, in any case be
electronic controls would
condemned land. The to-
SF2 - Re breathe r
Made in Germany-text:? Images:?
Kreislaufge devices
participating popularity of devices like
the inspiration, megalodon, the REVO
JJ-CCR or the talk in this regard
for themselves. "We have
various devices tested, but
100% of us could not ECCR device
"Convince Friese describes the development,
which led to SF2. "Most
it was the position of the counter lungs,
within our test group
Met with criticism. Lungs,
in the
Brus tbe -
rich
are certainly provide an excellent
Breathing comfort, but this is
not necessarily to diving comfort. "
Almost all currently available devices
position the counter on the lungs
Chest, which in technical diving
actually not without its problems.
The change from OC to CC designed
is difficult. Stages have different
be positioned and seated
often too low,
so trim and water resistance
be adversely affected. The positioning
of different accessories,
such as the backup
Lamp (s) must be reconsidered
be, as the lungs, a fastening
at the usual place
not allow it. "At some point
It was clear that the combination
from the general technical
Structure of SF1 with
an electronic monitoring
and control for us
the very best solution was. "
The SF2 was not at the beginning
planned as a commercial project.
"Initially we wanted to
actually within our
Group is technically possible
and explore to see if
are our thinking actually
into reality
left. That there is such a dynamic
would assume, I did not even
expected. "
The bottom of the SF2 comes divers
then PSCR-experience and
very familiar, although the carbon
Pipe from the outside a new and
offers high-quality appearance.
Among them are then
But the known Atembälge
(Amazingly, still
two - one large and one
smaller). The closing membrane
of the small bellows, which when
PSCR parts of the respiratory gas
encapsulates, but you are looking for
vain. "Technically
could be on the inner
Without bellows, "said
Friese, the design concept,
"But he is an ideal water trap
so I have
leave it in place. "
The centerpiece of the SF2 is
actually a nearly complete
New development.
This had two different
Requirements
on modern rebreathers
be implemented. On the one
sitting here, the bypass,
contribute to the low volume in the system
automatic gas feeds
which are here the connections
the "Manuals Ads" which allows the diver
That allow oxygen or manually
Diluent to feed.
About the middle piece, sits again
wrapped in a carbon tube, one to
to 2.2 kg synthesis scrubber tank. Stores
need for assembly or disassembly
of the way, not SF2. All
Glands of the device may
easily opened by hand or closed
be. This also applies to the
Electronic Chamber of SF2, which underneath
the head is. Sit here
three oxygen cells and the solenoid valve.
All the electronics are well
protected. Small amounts of moisture,
for example, by condensation,
can harm it.
The connecting pieces of the set breath
slightly bent at the head mounted.
This leads to an optimal positioning
the clothing and a
ultimate comfort for the diver.
When the external structure is the clear
Lines thanks. The SF2 is
with different bottle sizes
be operated. 3-liter bottles in harmony
But size is technically the best
with the device. The rebreather
is lightweight, but for a
better fitness and a reduction
the additional required amount of lead
are 300 bar cylinder certainly the
better choice. Attached to the bottles
with Quick Snap systems. This
provide an unusually easy
Handling during assembly and disassembly.
But not only the ease of handling,
but also access to bottles
with larger volumes shows the advantage
the tube-building towards rebreathers,
in completely in a box
be packed. "The SF2 is directed
for advanced or technical
Divers! "Describes the Friese
Reasons for the development. "This group
has certain needs and expectations
with respect to structure undAusstattung
a circulation device. This we have
considered and implemented. "What
The designer says it is very
quickly evident when the front
considered the SF2. Had there not
the breathing serpent, one could SF2
also consider an OC device, so clear
and tidy is the front end
therefore. From Rebreather interesting perspective
is the right side of the diver. Here
sit the aforementioned "Manual
Ad "and" Off Board Gas Connector. "
The latter, a female coupling
Swage Lock Company is again
a reminiscence of the technical
Taucher. With the Off Board Connector
is possible, the rebreather
to operate with stage bottles. The
technical diving is so important
The basic idea of ​​redundancy is therefore
considered and implemented technically good.
The same applies to the "Manual
Ad ", which the diver to
are manually diluent or oxygen
injected. The prototype has
a one-sided "Manual Ad", but whether
this persists in the series production,
white designer Friese yet
not with certainty. "We have both
combined and separate manual Ads
tested. Both have advantages and disadvantages.
But we will decide shortly,
which option is to go into production. "
Distributors of SF2 is in German
Area by the company
dive2gether, whose Managing Director
Horst Dederichs quite confident
a short series start
expressed. "We have decided to
the SF2 in the certification exam in Duisburg
to leave. There we are on high
Expertise and friendly contact
encountered by our project since
accompany some time. Since we are international
Distributors are involved,
are the enormous costs to different
Heads and distributed fairly
manageable, "says Dederichs
the strategy for mass production
should lead.
Rebreathers are part of the PSA category
III, which most technical
Divers are well aware. Certification
according to EN 14143 is therefore imperative
required for a circuit device,
As the saying in the German jurists say,
"Putting on the market." Strangely,
This is handled very often lax. Various
current devices have to
still no certification, although this
are commercially available. This Dederichs:
"I'm still not a friend,
the exuberant Zertifizierungswut,
not least the EU which we brought
, but is, there is legislation to
we are the manufacturer must adhere. A
Circuit device is a so complex
technical device that a review
by a competent and independent
Location makes perfect sense. "
(Editor's note: Compare
Please refer to the article "The CE marking
of diving equipment - (but) a
Of quality? "In Peter Schetter
Wetnotes issue 01/2010)
After a long development and
Test phase to give the two friends at
her project full speed now. "On the
Boot 2011, we will introduce a device that
be certified either completely
or at least the important tests
already passed the certification
has! "
The team wishes the Wetnotes
them all the best in its ambitious
Project is and of course his readers
more about news
inform the SF2.
Translated with Google tanslate.
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Old 14th March 2011, 16:20   #2 (permalink)
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Re: SF2 - Rebreather

How will it be to breathe on rebreather that have the lung mounted so far down on your back like a pSCR/RB80?
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Old 15th March 2011, 16:44   #3 (permalink)
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Re: SF2 - Rebreather

yes it is
only without the mushroom valve in the small counterlung
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Old 15th March 2011, 23:47   #4 (permalink)
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Re: SF2 - Rebreather

Deco Weenie did this a few yeas back with an EDO 04 IIRC. He has a post some where about it. He called it the XCR, unfortunately his web page is no longer working.
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Old 16th March 2011, 00:48   #5 (permalink)
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Re: SF2 - Rebreather

Quote: (Originally Posted by offpro) View Original Post
How will it be to breathe on rebreather that have the lung mounted so far down on your back like a pSCR/RB80?
I found the KISS lungs tolerable when vertical and good when horizontal so I shouldn't think it would any worse than a KISS Sport though surely?
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Old 16th March 2011, 01:20   #6 (permalink)
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Re: SF2 - Rebreather

*if* the CL is in the same place as the RB80, vertical is a bitch.

I havent seen any decent teardown pics, but I just dont get why anyone would use bellows in a CCR for a counterlung and especially why they'd keep nest counterlungs. It just seems like an exercise in making a car from a boat.
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Old 16th March 2011, 15:59   #7 (permalink)
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Re: SF2 - Rebreather


The fact was we did the first 3 measurements in a vertical position, the second in the overhead position and the 3rd in a horizontal swimming position. The first two, the pressure differences were in the range of 20 mbar, in a horizontal swimming position at a maximum 7.5. The whole min then at a AMV of 60 L / and a volume of 2.5 liters. Atemhübe ie 24 per minute.
In an AMV of 20 liters, the value of the horizontal position mBar reduced to below 5.

origianal: SF2 - diskutiert auf Taucher.Net
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Old 16th March 2011, 17:08   #8 (permalink)
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Re: SF2 - Rebreather

Quote: (Originally Posted by Mario.N) View Original Post

I'm not very good at speaking German, but from what I can see it shall be CE tested this spring?
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Old 16th March 2011, 17:28   #9 (permalink)
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Re: SF2 - Rebreather

yes, correct
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Old 18th March 2011, 14:35   #10 (permalink)
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Re: SF2 - Rebreather

SF2 in action
Attached Images
File Type: jpg sf2.jpg (79.2 KB, 1809 views)
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