Respiratory gas analysis instrument having improved volume calibration method and apparatus
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United States of America Patent
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May 15, 1984
Grant Date -
N/A
app pub date -
Jul 2, 1982
filing date -
Jul 2, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved gas volume calibration method and apparatus for use in respiratory gas analyzers. A control unit monitors the flow of calibration gas through the analyzer by monitoring the electrical signals produced by a gas turbine and a breath switch. During calibration, a known volume of calibration gas is repeatedly delivered to the analyzer from a calibration syringe at each of a number of different flow rates. On the basis of the information received from the turbine and the breath switch, the control unit generates and stores a piecewise linear approximation of the nonlinear characteristic of the turbine. This stored turbine characteristic is then made available during subsequent measurements to eliminate those volume errors which are associated with variations in the rate at which the sample gas is delivered, thereby affording measurements of improved accuracy.
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