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A low cost gas mixer.

P C Beatty1

  • 1Regional Department of Medical Physics and Bioengineering, University Hospital of South Manchester, UK.

Journal of Biomedical Engineering
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost gas mixer for creating precise gas mixtures. The apparatus achieves high accuracy for both permanent gases and volatile agents, enabling reliable gas composition control.

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Area of Science:

  • Analytical Chemistry
  • Chemical Engineering
  • Instrumentation

Background:

  • Accurate gas mixture preparation is crucial for calibration and research.
  • Existing methods can be expensive or lack precision for certain applications.
  • Volatile agents require specialized mixing techniques due to their properties.

Purpose of the Study:

  • To develop and validate a low-cost gas mixer for permanent gases and volatile agents.
  • To assess the accuracy and concentration range of the developed apparatus.
  • To determine the stability of gas mixtures stored within the device.

Main Methods:

  • The gas mixer utilizes the principle of mixing known volumes of gases at constant pressure and temperature.
  • Accuracy was evaluated for two- and three-part mixtures of permanent gases and volatile agents.
  • Concentration stability was assessed over a 2-hour storage period.

Main Results:

  • The apparatus demonstrated an accuracy better than +/- 0.08% vol/vol for both gas types.
  • Accurate mixing was achieved for permanent gases across a 1-99% vol/vol concentration range.
  • For volatile agents, the mixer was effective for concentrations below 5% vol/vol.
  • Gas mixtures remained stable within the accuracy limits for up to 2 hours.

Conclusions:

  • A cost-effective and accurate gas mixer has been developed.
  • The device is suitable for preparing precise gas mixtures for various applications.
  • The mixer offers reliable performance for both permanent gases and low-concentration volatile agents.