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Thread: What is the Single Greatest Feature ("SGF") from each rebreather?

  1. #91
    PRISM DIVER & LUVIN IT! dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000 is just really nice dive2dive2000's Avatar
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    Re: What is the Single Greatest Feature ("SGF") from each rebreather?

    Quote Originally Posted by Chett.L  View Original Post
    When you say your suggestion would be to either fly the loop manually, I want to point out how important it is to keep a very close watch on the PO2 especially near the surface because the prism does not have a mass flow orifice.
    Chett, I assumed our group did not need the obvious posted

  2. #92
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    Re: What is the Single Greatest Feature ("SGF") from each rebreather?

    Quote Originally Posted by dive2dive2000  View Original Post
    Hi Mike,

    As far as diving a PRISM in high altitude areas or areas were you cant get 98% or better O2 My suggestion would be to either fly the loop manually or use another ECCR Because the PRISM was not designed for this type of diving. .
    The rejection of your calibration settings have to do with the minimum expected millivolt output of the sensors of a properly flushed system, not necessarily the O2 concentration inside the loop. If the electronics are asked to accept any sensor which falls below this expected minimum millivolt output, it will reject the calibration. This was a safety feature designed to detect severely voltage limited cells, albeit a primitive one. The PRISM works quite well at altitude, however expected PO2's must be figured manually, and aged cells may become a problem sooner at high altitude.
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  3. #93
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    Re: What is the Single Greatest Feature ("SGF") from each rebreather?

    guys, can you take this to a new thread? lets stay on topic!

    g

    Quote Originally Posted by saveourseas  View Original Post
    The rejection of your calibration settings have to do with the minimum expected millivolt output of the sensors of a properly flushed system, not necessarily the O2 concentration inside the loop. If the electronics are asked to accept any sensor which falls below this expected minimum millivolt output, it will reject the calibration. This was a safety feature designed to detect severely voltage limited cells, albeit a primitive one. The PRISM works quite well at altitude, however expected PO2's must be figured manually, and aged cells may become a problem sooner at high altitude.

    Gill Envy

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