Measuring and testing – Miscellaneous
Patent
1989-12-08
1990-11-20
Raevis, Robert
Measuring and testing
Miscellaneous
738651, G06F 1542
Patent
active
049708970
ABSTRACT:
A portable, battery powered apparatus is provided for determining and displaying the amount of time that a fixed supply of breathable gas can sustain a consumer who wishes to breathe the gas at one or more ambient pressures. The apparatus include a device for measuring the ambient pressure in the vicinity of the consumer at least once every ten second and for generating signals representative of the ambient pressure. A device is provided for measuring the pressure of the supply gas and for generating signals representative of the supply gas pressure. The apparatus preferably includes a programmed microprocessor which periodically receives a series of supply gas pressure measurement signals and periodically determines from the series of supply gas pressure measurement signals the average rate at which the supply gas was consumed (Consumption Rate) over a time at least five times as long as the average time between the supply gas pressure measurements. A normalized Consumption Rate is determined by normalizing each determined Consumption Rate to compensate for the ambient pressure on the consumer during the time period over which the Consumption Rate was determined. A normalized Consumption Time is determined by dividing a supply gas pressure measurement by the normalized Consumption Rate. A projected Consumption Time is determined for one or more ambient pressures of interest by adjusting the normalized Consumption Time to each ambient pressure of interest. A display is provided for receiving and displaying to the consumer one or more projected Consumption Times and one or more associated ambient pressures.
REFERENCES:
patent: 3364476 (1968-01-01), Kahn
patent: 4109140 (1978-08-01), Etra
patent: 4586136 (1986-04-01), Lewis
patent: 4658358 (1987-04-01), Leach et al.
patent: 4736348 (1988-04-01), Bednarczyk
patent: 4753117 (1988-06-01), Osterhout et al.
patent: 4782338 (1988-11-01), Barshinger
patent: 4809550 (1989-03-01), Faulconer
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