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O2 Cell Replacement Time....

Discussion in 'Rebreather Diving' started by darylm74, Jan 4, 2019.

  1. Jeremy Williams

    Jeremy Williams Nassau Grouper

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    I think Posiedon would be happy for you to use them on other rebreathers. You just have to do it as a parallel electronic interface to whatever you have right now. Per DGX prices, that's $1800 for the SSO2 sensor and CPOD bundle and $1800 for an M28 computer. You probably need a T also, but that's a rounding error. It's not an inexpensive retrofit proposition at the moment. Given the digital interface to the sensor, who knows when it will become a drop-in option to any other rebreather. The key question is probably when will Shearwater add support for it to their DiveCAN controllers. I strongly suspect that Poseidon put the CAN bus chip in the CPOD and not directly on the sensor but I don't know that for certain.
     
  2. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    @Jeremy Williams IIRC Shearwater said they had some in for testing. There is definitely going to be a delay in production and @Shearwater surely won't release anything official until they've proven in. @Bruce_Partridge can you weigh in on this at all?
     
    taimen likes this.
  3. kelemvor

    kelemvor Big Fleshy Monster ScubaBoard Supporter

    # of Dives: 100 - 199
    Location: Largo, FL USA
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    The information Poseidon provided to various "news" sites indicated the sensors would also have an analog output.

    Poseidon Announces "Game-changing" 'Solid State Oxygen Sensor'
    Did it change, or was the initial info provided to the press inaccurate or some third thing?

    I remember shopping for RB's and at one point I was interested in Poseidon seven. I know it comes with a computer, but I could have sworn you could upgrade to shearwater electronics. Maybe that upgrade isn't available anymore if the sensors are only compatible with the Poseidon computer. Seems a shame to have to give up one nice feature in order to gain another.. if that's the case.

    Do you know for sure that the analog output has been removed?
     
  4. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    @kelemvor the CPOD has an analog output because it includes the canbus interface. I believe it is powered by the M28.
    "All" shearwater has to do is develop an O2 board that will power the cell, and process the input signals. I'm 98% confident they have either done it or are really close. The question is whether they've deemed the product reliable enough, both from an actual working function, but more importantly from a supply chain perspective.

    $1800 for the cell/cpod/cable
    cpod is $570, and the Cable is $250, so the cell is $1k ish.

    I do not believe the Poseidon has ever been available with a Shearwater computer unless you used the 3rd cell holder to an independent computer. I do not believe that was ever offered from the factory/dealer so you had to buy the 3rd cell holder from Poseidon, then buy the Shearwater from another dealer.

    The Se7en's that are older than 2ish years IIRC need to be sent back to the factory to have their O2 boards upgraded to accept the SSS inside of the head and you need to have the M28 upgrade as well.
     
    kelemvor likes this.
  5. taimen

    taimen ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Europe
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    The SSS was "released" is 2016 and should have been delivered for over a year now. For some reason we haven't been able to hear/read any first hand user experiences online or in the press. Are current users actually still beta testers and under NDA or what is going on? Are their issues with the SSS, either reliability or production numbers?
     
  6. Superlyte27

    Superlyte27 Cave Instructor

    # of Dives: 5,000 - ∞
    Location: Florida
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    I thought divers had thicker skin. Grow up. It's just a word and this isn't the beginners forum.

    I have to wonder if you actually read what I wrote. Try it again.

    If you pump your loop full of pure oxygen and immediately descend beyond 20', what do you call it? We can use your term I guess, whatever that is. But to me, it's stupid. Kinda like looking down the barrel of a gun to determine if it's loaded.

    I guess I could have said, "you don't possess the common sense and intelligence necessary to dive a CCR" but "stupid" was less typing.
     
  7. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
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    not many divers that you hear from use the Se7en and with the cost to upgrade them, I'm not sure how many actually have been done yet. I wish they would release some more information though
     
    taimen likes this.
  8. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
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    betting the production numbers just don't exist
     
    taimen likes this.
  9. 688ClassRebreather

    688ClassRebreather Angel Fish

    # of Dives: 1,000 - 2,499
    Location: Maryland, USA
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    At the risk of getting way too far from the original question, I dive the Se7en with the M28 and solid state sensor (SSS). I also dive the Inspo and have an aftermarket (TECME) T-piece to use the M28 and SSS on it as well. I probably have over 200 dives with the SSS between the two rebreathers.

    I love it and have not had any issues with it. It responds more quickly than the galvanic cells even though it is installed down stream of them. Since it is only used as an extra cell and not controlling the loop, yet, it has limited utility. Poseidon should be able to upgrade my emodule to use it in the head in the near future, and I will definitely get mine done.
     
    taimen and Jeremy Williams like this.
  10. michael-fisch

    michael-fisch ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Finally Lake City FL
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    My info is that they cost about 800 Euros retail each , that the manufacturer is locked into a contract with Poseidon for anything diving related, and if you were able to buy them for any other use the manufacturer would still want about 650 Euros each. You are still stuck with creating your own interface to whatever dive computer you are using since the Poseidon M28 probably is not the last step in dive computers. Would recomend that somebody designs an interface with a linear analog output of 12mV at 960 mBar in Air and 57.1mV at 100% O2, with more than one battery and seperate circuitry for each sensor.
    Since the solid state sensors are not expected to last much more than 10 years, I'm not sure that it will ever become cost effective.
    Michael
     
    rjack321 likes this.

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