• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

Cells, Mvs and linearity in the older unit

Discussion in 'Rebreather Diving' started by JonG1, Nov 18, 2019.

  1. JonG1

    JonG1 Nassau Grouper

    # of Dives: 2,500 - 4,999
    Location: Glossop UK
    137
    41
    28
    My Predator finally revealed why it had been giving errant battery readings when one of the leads to the battery snapped.

    No bother I figure, hooking up my SW Gradient Factor to the unit, however the GF doesn't compensate for altitude and atmospheric so will exhibit some margin of error over a compensated PDC.

    I also seem to recall that my original KISS triples didn't have the facility to read MV or compensate for altitude would have been impossible to check for linearity.

    So my guess is that back in the day there was no option but to dive with some degree of inaccuracy and less confidence in linearity checks?
     
    taimen likes this.
  2. JonG1

    JonG1 Nassau Grouper

    # of Dives: 2,500 - 4,999
    Location: Glossop UK
    137
    41
    28
    I was thinking this might spark some debate about how much accuracy is actually required/demonstrated in cells and what the real world implications are in terms of linearity, especially if historically in the absence of atmospheric compensation calibration was compromised.

    Does anyone have any insight at all
     
  3. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,134
    3,041
    113
    Narked has made a pressure pot for a long time (20yrs?). Anything that isn't measure deviation from linearity above the actual diving setpoint is a bit of a WAG anyway.
     

Share This Page