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Related Experiment Videos

Programmable gas mixer for controlling concentration as a function of time.

J Jacky

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |July 1, 1980
    PubMed
    Summary

    This study presents a low-cost, microcomputer-controlled device for precise gas concentration management. The apparatus accurately controls gas mixtures over time, ideal for dynamic experimental setups.

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    Area of Science:

    • Engineering
    • Chemistry
    • Computer Science

    Background:

    • Precise control of gas mixtures is crucial for various scientific experiments.
    • Existing methods may lack flexibility, accuracy, or affordability for dynamic concentration control.

    Purpose of the Study:

    • To develop an accessible and accurate device for programmable, time-varying gas concentration control.
    • To enable arbitrary waveform generation in gas mixtures up to 4 Hz.

    Main Methods:

    • Utilizes a microcomputer to control individual on/off solenoid valves for each gas.
    • Employs pulse-width modulation to regulate gas concentration based on programmed time intervals.
    • Allows for both pre-programmed and external signal-driven control of gas mixtures.

    Main Results:

    • The apparatus can generate arbitrary time-varying gas concentrations with high accuracy and repeatability.
    • Achieves control at frequencies up to 4 Hz and down to ultra-low frequencies.
    • The system is constructible from common components for under $600.

    Conclusions:

    • This device offers a cost-effective and versatile solution for dynamic gas concentration control.
    • Its accuracy, repeatability, and programmability make it suitable for advanced research applications.
    • Facilitates precise gas mixture manipulation in experimental settings.

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