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Method and apparatus for determination and display of critical gas supply information

  • US 4,876,903 A
  • Filed: 03/21/1988
  • Issued: 10/31/1989
  • Est. Priority Date: 01/11/1988
  • Status: Expired due to Fees
First Claim
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1. A portable diving apparatus for continuously displaying, during a dive, the amount of time that a known amount of pressurized breathable gas can be consumed at a known rate from a fixed volume container if a user changes from a present ambient pressure during a dive to some other ambient pressure comprising:

  • means for determining a current ambient pressure of the user;

    means for determining the amount of breathable gas in the container;

    means for determining the present consumption rate of gas by the user at the current ambient pressure;

    means for determining the maximum time (Adjusted Remaining Air Time) that the remaining supply of gas will sustain the present consumption rate of the gas by the user at the present ambient pressure and for each of a plurality of ambient pressures other than the present ambient pressure, and allowing for any predetermined reserve; and

    display means, including a two-dimensional pictorial display showing variations in depth along one axis and increments of time on the other axis for simultaneously, graphically displaying to the user representations of the current ambient pressure, the other ambient pressures and the associated Adjusted Remaining Air Time for the current ambient pressure and for each of the other ambient pressures.

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