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  • Pelagian DCCCR
    circuit board got fried on the battery plus side but all components were ok After that we started potting the PCB s To test it I deliberately did two dives with a completely flooded housing and still enjoyed reading the Po2 on both displays After the dives I rinsed the electronics in fresh water and dried it I still use that display today I might ad that the case is sealed from the breathing loop and kept at 1 ATA You can turn the display on and off and also turn backlight on and off with only one magnetic switch Q Where is the battery and what type is used A The battery is a normal 9V square that you can buy cheap in 7 Eleven It is kept in the head in it s own sealed compartment This is to address the problems that usually happen after opening and closing the display to many times and also to keep the size of the hand unit down The Pelagian s display case never have to be opened For serious deco dives most RB divers prefer to ad an on line computer There is already a bulk head fitting for the cable with a blank plug installed in the head To install the computer cable simply open the fitting pull out the plug and run the cable through If some one would like an additional display instead of a computer we sell that as an option Q What is the scrubber duration and what method was used to gauge it A We have not done any CE or other third party testing We have simply calculated the weight of the soda lime the volume and gas path of the scrubber against typical metabolism This gave us a ballpark figure Then we dived it during 8 months to much more than the rated duration On the last dive before a scrubber change I many times pushed it by swimming really hard for 10 minutes During the initial dives I worried about it as I am quite sensitive to CO2 and get head aches easily and it was a real boost of confidence when I didn t get any We rate our standard scrubber to 4 hours in cold water and 6 hours in tropical water We have a longer optional scrubber mid section that is rated up to 8 hours This means low CO2 and warm water The durations given by many other manufacturers are very conservative as unrealistic testing methods are used Our figures are based on real dives instead of in the worst case scenario dives If someone is actually planning on producing 2 liters of CO2 per minute continuously they should not dive to our rated durations Our durations are no mystery In a standard RB class the instructor tells his students that RB X scrubber duration is 3 hours Then he goes off diving it to 4 hours or more when the student is not watching Of course

    Original URL path: http://www.therebreathersite.nl/05_Reviews/pelagian_dcccr.htm (2016-05-02)
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  • Biomarine MK15
    efforts to make the old unit in good order and made some modifications to the loop and webbing I Have split the article in a few photo sections to give a nice overview of the unit I hope you enjoy the pictures John thanks for contributing Finally John decided to make an upgrade by selling a new MK 15 5 so the shown unit is for sale If you are interested don t hesitate to sent an email to me Overview Webbing Loop and Mouthpiece Bottles Diluent Bottles Cells Electronics Gas System Instruments Manual Gas Addition System Scrubber Section Sale The Mark 15 emerged from BioMarine somewhere between 1972 74 The US Navy was interested in these rebreathers and commissioned BioMarine to develop the Mark 15 which was essentially a copy of the CCR 1000 with some military style modifications such as Tritium filled gauges and modified harnesses OVERVIEW WEBBING DIR webbing and a perfect harness on ECCR 1980 rebreathers LOOP and MOUTHPIECE The original mouthpiece has been replaced Inspiration Mouthpiece To use larger diameter hoses John replaced the loop connectors BOTTLES Diluent bottle Big difference in opening Oxygen has small hole CELLS ELECTRONICS GAS SYSTEM INSTRUMENTS MANUAL GAS ADDITION

    Original URL path: http://www.therebreathersite.nl/11_Closed%20Circuit%20Rebreathers/biomarine_mk15.htm (2016-05-02)
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  • Prototype?
    com I am so sorry about the car It is wrong They did not have a Toyota Yaris back in 1987 The picture shows the prototype of the Cis Lunar MK I back in 1987 The car in the back

    Original URL path: http://www.therebreathersite.nl/11_Closed%20Circuit%20Rebreathers/prototype.htm (2016-05-02)
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  • LAMA LBS
    Before this period the Lama company developed several rebreathers In an earlier article you could find more information This wonderful unit is called the LBS LBS stands for Lockout Breathing System It was designed to be used from a submarine that consist of a pressurized chamber with a lockout for the diver A second part of the sub was build to be atmospheric The unit used mixgas supplied by a umbilical Double scrubbers and gas heating was supplied The unit designed in the 80 s is a beautiful unit and should be an example for constructors of today The L B S wa equipped with communication between diver and attendant Also there was a double gas supply system Gas was added by means of a solenoid and injections where dependant to the divers breathing frequency Communication was mounted in the atmospheric part of the submarine Notice that the gas is supplied at 10 bar meaning a maximal depth of 90 meters The unit works in closed circuit modus It is a rather unique system The solenoid injects the mixgas with a constant mass The length of the injection depends on the divers VO2 The injection length was limited by a

    Original URL path: http://www.therebreathersite.nl/SemiClosed%20Rebreathers/France/lama_lbs.htm (2016-05-02)
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  • LAMA Scanuba
    surface and uses the depth the diver has descended to to calculate the optimal nitrox mix The mix is made from pure oxygen and air according the following diagram Here you see that pure oxygen is used up to a depth of 6 meters Then the air injection starts Since the air contains oxygen too the supply of pure oxygen is decreased until a depth of approx 80 meters When

    Original URL path: http://www.therebreathersite.nl/SemiClosed%20Rebreathers/France/lama_scanuba.htm (2016-05-02)
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  • Boosterpage
    Nitrox or even air can be transferred Be VERY careful using boosters You need special training and knowledge to use these devices in a safe way Very often there are second hand boosters available in the webshop For those who are interested I have some manuals about boosters for sale explaining how they work This page is about the Dräger U300DS Haskel one of the leading manufacturers HERE Another big

    Original URL path: http://www.therebreathersite.nl/05_Reviews/boosterpage.htm (2016-05-02)
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  • rEvo
    duiker De riemen van het harnis lopen doorheen de lendesteun om zo over te gaan naar de buikriemen Zowel op het schouderstuk als over de lendesteun wordt mbv het harnas een rubberen beschermplaat vastgezet De gemonteerde wing is zo opgebouwd dat de aansluiting naar de inflator verzonken zit in de rvs omkasting De konstructie van zowel de twee delige backplate onder hoek geplaatst de dunne rvs omkasting en de verzonken aansluiting van de wing zorgt ervoor dat de rebreater volledig tegen de rug kan aansluiten en alzo de meest gestroomlijnde vorm heeft Tevens zorgt de perfekte aansluiting ervoor dat de hydrostatische drukverschillen verwaarloosbaar zijn de tegenlong kleeft ahw tegen de rug van de duiker aan Ook hierdoor wordt uiteraard de WOB in normale duikhouding gunstig bevorderd Scrubbers In the rEvo you ll find an unique scrubber system placed in line both contain about 1 4 kg of sofnolime and are attached to each other by holes in the scrubber lid In practice the scrubber will be absorbed at first at the entrance of the container at the exit the sofnolime will never be absorbed because the material will be replaced in time to prevent diving with a no longer absorbing scrubber However it has never been known how much of the scrubber has been used a fact is that always a sufficient amount of unused absorbent will be thrown away The system of two scrubbers placed in line has a favorable effect in using the absorbent as long as the correct working method is applied The filled cartridges can be detached in a simple way with just one screw the lid can be removed to detach the cartridges form the scrubber container This simplifies the next working order you start with two fresh filled cartridges number 1 will be placed above the exhale counter lung at the top of the rebreather number 2 above the inhale lung the numbers are written on the cartridges so no mistake can be made After a certain period of diving time depending on the circumstances see later a next working order will be applied cartridge number 1 exhale side will be removed and emptied cartridge 2 will be mounted above the exhale counter lung and cassette 1 with fresh sofnolime will be placed above the inhale lung after that you ll have the same diving time as before followed by a new working cartridge exchange cycle and so on The consequence of this working cycle is that you ll always get rid off half of the sofnolime the part that s mostly absorbed the absorbent that was attached to the exhale counter lung the lung where the exhaled gas will be pass first The lesser or almost not used absorbent will be placed at the beginning of the breathing cycle the place where the exhaled gas will pass first Here the absorbent will absorb the CO2 easily as the of the CO2 will still be high and will be almost completely absorbed the second fresh scrubber will absorb the possible rest of the low CO2 From experience I can tell that the procedure of systematically getting rid of half of the absorbent the most absorbed part and after that get the next part absorbed the duration time can be expanded of the sofnolime can be expanded by 50 But by holding on to the same duration times of an equally same size one part scrubber the double scrubber system offers much more safety Practically seen a quit dive warm water and not to deep gives you 150 minutes per cycle about 1 8h kg absorbent never gave me any problem Heavier circumstances cold or deep 120 minutes per cycle Scrubbers De rEvo maakt gebruik van een uniek systeem van twee in serie geplaatste scrubbers beiden bevatten ongeveer 1 4 kg sorb en zijn met elkaar verbonden dmv openingen doorheen het deksel Praktisch is het zo dat aan de ingang van een scrubber de sorb altijd als eerste verzadigd is aan het uiteinde van de scrubber is de sorb nooit volledig verzadigd daar het materiaal voldoende snel wordt ververst om te voorkomen dat met een uitgewerkte scrubber wordt gedoken Nooit is echter juist gekend hoever de scrubber is verbruikt zeker is dat altijd een voldoende hoeveelheid ongebruikte sorb wordt weggegooid Het systeem van dubbele in serie geplaatste scrubbers komt het beter benutten van sorb ten goede indien de juiste werkwijze wordt gevolgd De casettes met sorb kunnen in een handomdraai verwijderd worden één enkele schroef laat toe het deksel te verwijderen om vervolgens beide casettes uit de scrubberhouders te halen Dit vereenvoudigt volgende werkwijze men start met 2 nieuwe verse sorbcassettes nummer 1 wordt boven de uitademlong geplaatst bovenaan in de rebreather nummer 2 boven de inademlong de nummers zijn aangebracht op de casettes om ze niet te verwisselen Na een bepaalde gebruiksduur afhankelijk van omstandigheden zie verder wordt volgende cyclus uitgevoerd casette 1 uitademzijde wordt weggenomen en leeggemaakt casette 2 wordt boven de uitademlong geplaatst en casette 1 gevuld met verse sorb boven de inademlong vervolgens kan weer dezelfde tijd worden gedoken om nadien weer een wisselcyclus uit te voeren enz enz Het gevolg hiervan bij elke cyclus wordt de helft van de totale hoveelheid sorb weggegooid nl die helft die veruit het meest gebruikt is de sorb die aan de uitademlong zat waar het uitgeademende gas eerst doorheen ging De minder of bijna niet gebruikte sorb wordt vooraan in de ademcyclus geplaatst daar waar het uitgeademende gas eerst passeert deze sorb heeft geen moeite om co2 uit een gas te absorberen waar het co2 nog hoog is en dus op zijn beurt bijna volledig verzadigd worden de tweede verse scrubber neemt wederom de eventuele resterende lage CO2 voor z n rekening Uit praktijkervaring blijkt dat het systematisch weggooien van de halve hoeveelheid sorb de meest verzadigde scrubber en vervolgens weer het verder verzadigen van het volgende deel van de scrubber de gebruiksduur van sorb makkelijk met 50 verhoogt Indien toch maar dezelfde totale

    Original URL path: http://www.therebreathersite.nl/05_Reviews/revo.htm (2016-05-02)
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  • Optima rebreather
    by third parties Dive Rite supplies the webbing and harness Electronics are made by Juergenson Shutoff valve by M J engineering Details of the unit Dive Rite website http www diverite com Dive Rite express http www diveriteexpress com Cylinders can be 2 or 3 litre OPV is mounted on the divers right side on the bottom The ADV is mounted on the left side and equipped with shut of

    Original URL path: http://www.therebreathersite.nl/05_Reviews/optima_rebreather.htm (2016-05-02)
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