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An air-entrainment device for preparing precision gas mixtures
Journal of Medical Engineering & Technology
|May 1, 1983
Summary
Low-cost venturi devices can create precise gas mixtures for calibrating gas analyzers. These simple devices offer an inexpensive method for generating accurate oxygen (O2) and nitrogen mixtures.
Area of Science:
- Analytical Chemistry
- Instrumentation Engineering
Background:
- Gas analyzers require precise calibration gas mixtures for accurate measurements.
- Traditional methods for preparing calibration gases can be expensive and complex.
Purpose of the Study:
- To evaluate the efficacy of low-cost venturi devices for preparing precision gas mixtures.
- To determine if venturi devices are suitable for calibrating gas analyzers.
Main Methods:
- Three venturi devices were constructed using readily available materials.
- Pure oxygen (O2) and nitrogen were used as priming gases.
- Generated gas mixtures were analyzed for O2 concentration and variability over time.
Main Results:
- Venturi devices produced O2 concentrations ranging from 12% to 53%.
- Variability in O2 concentration was less than 0.25% over two weeks.
- Mixture composition depended on priming gas density but not flow rate.
Conclusions:
- Venturi devices provide a simple and inexpensive method for preparing precision gas mixtures.
- These mixtures are suitable for the calibration of gas analyzers.
- The venturi method offers a cost-effective alternative for gas calibration.