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The ejector flowmeter: an evaluation of its accuracy.

J Waaben, A Thomsen

    Acta Anaesthesiologica Scandinavica
    |January 1, 1978
    PubMed
    Summary
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    This study evaluated five ejector flowmeters using different gases and flow rates. Results showed significant variations between devices and gas mixtures, but linear calibration across flow rates.

    Area of Science:

    • Engineering
    • Fluid Dynamics
    • Measurement Science

    Background:

    • Ejector flowmeters are utilized in various industrial and scientific applications.
    • Accurate gas flow measurement is critical for process control and research.
    • Understanding flowmeter performance with different gases is essential for reliable data.

    Purpose of the Study:

    • To assess the accuracy and reliability of five ejector flowmeters.
    • To determine the impact of different gas compositions (oxygen, nitrous oxide) on flowmeter readings.
    • To evaluate the linearity of ejector flowmeter calibration across various flow rates.

    Main Methods:

    • Five ejector flowmeters were tested under controlled conditions.
    • Calibration was performed using a precise soap-bubble flowmeter.

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  • Measurements were taken using three different gas mixtures (100% O2, 50% N2O/O2, 100% N2O) at four distinct flow rates.

    • Main Results:

    • Significant variations in accuracy were observed among the individual ejector flowmeters.
    • The performance of the flowmeters differed notably between the tested gas mixtures.
    • Calibration demonstrated linear behavior across the four tested flow rates, irrespective of gas composition.

    Conclusions:

    • Ejector flowmeter accuracy is influenced by both the specific device and the gas being measured.
    • The linear relationship between flow rate and calibration factor simplifies usage within the tested range.
    • Careful selection and calibration of ejector flowmeters are necessary for accurate gas flow measurements.