Dynamic gas density compensation in pulmonary gas analyzer syste

Details Dynamic gas density compensation in pulmonary gas analyzer syste Dynamic gas density compensation in pulmonary gas analyzer syste

1994-03-24

1996-03-26

Cosimano, Edward R.

Boots, shoes, and leggings

73 4R, 7386101, 36457101, 36457102, 36457104, G01L 2700

Patent

active

055026605

ABSTRACT:
A method is described for dynamically calibrating a flowmeter used in cardiopulmonary performance analyzing equipment which takes into account the ambient conditions at the test site in terms of relative humidity, barometric pressure and temperature. At the time of factory calibration, a density factor is computed and stored in a nonvolatile memory along with a calibration factor obtained by passing a known volume of gas at a known relative humidity, temperature and pressure through a pneumotach mouthpiece in a predetermined time span. When the system is being used in the field to evaluate a patient, a new density factor is computed that takes into account the relative humidity, barometric pressure and temperature at the test site and this new density factor along with the density factor previously computed and stored at factory calibration are used to compute a new flow calibration factor for use in obtaining an accurate flow parameter from the system flowmeter.

REFERENCES:
patent: 3026868 (1962-03-01), Weinberg
patent: 4386604 (1983-06-01), Hershey
patent: 4463764 (1984-08-01), Anderson et al.
patent: 4754651 (1988-07-01), Shortridge et al.
patent: 4911021 (1990-03-01), Shortridge et al.
patent: 5038773 (1991-08-01), Norlien et al.

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