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legacy analog HUD?

Discussion in 'Shearwater Research' started by rjack321, Feb 7, 2019.

  1. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,059
    2,920
    113
    I have an analog HUD on my KISS and can't tell from the manual. Does it round fractional ppO2 up or down? Does it follow normal algebra rules or something else? Does the rounding protocol change if its higher or lower than 1.0?

    Ie if I have:
    1.19, 1.23, 1.28
    do I get green/green/green, green/green/green, _____/______/green?
    both rounding up to 1.2, down to 1.2, and also up to 1.3
    or
    1.07, 1.04, 1.09
    green/green/green? Rounding down to 1.0

    Hopefully this is a clear question.

    On other units HUD round down below 1.0 (additional hypoxia warning)
    But up above 1.0 (additional hyperoxia warning)
    without following algebraic rounding rules. I was wondering if you HUD was doing something comparable or had a different set of rules. Its a bit challenging for me sleuth out.
     
  2. W W Meixner

    W W Meixner Rebreather Pilot

    # of Dives: 500 - 999
    Location: Ontario Canada
    755
    519
    93
    RJ...

    Suggest sending an e-mail to Mike Young at KISS...his response time is excellent...he'll answer your question...

    Best...

    Warren
     
  3. Shearwater

    Shearwater Dive Equipment Manufacturer

    256
    469
    63
    Hi, Richard. The rounding protocol does change depending on whether the PPO2 is higher than 1.05 or less than 0.95.

    When > 1.05, truncate(PPO2 + 0.04) to 0.1 resolution then 1 GREEN flash per 0.1 PPO2 over 1.0.
    • 0.95 - 1.05 – one orange
    • 1.06 to 1.15 – one green
    • 1.16 to 1.25 – two green
    • Etc.
    When < 0.95, truncate(PPO2 – 0.06) to 0.1 resolution then 1 RED flash per 0.1 PPO2 under 1.0.
    • 0.95 – 1.05 – one orange
    • 0.87 – 0.94 – one red
    • 0.77 – 0.86 – two red
    • Etc.
    Also, when GREEN flashes > 7, use high intensity flashes

    When RED flashes > 6, use high intensity flashes

    Cheers
     
    rjack321 likes this.
  4. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,059
    2,920
    113
    Awesome thank you.

    Ps I love the HUD, I know its not as flashy as the NERD but I feel compelled to have dual displays of some sort and this one alongside a fischer-predator suits my needs perfectly.
     
    Shearwater likes this.

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