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  • olli

    tag

    válasz lanszelot #19744 üzenetére

    Ez az érzékelő nem egyedi alkohol vegyi érzékelő, nem gázkromatográf, nem ilyen egyedi mérőeszköz: [link]
    [link]
    If you power off the heater letting the temperature goes down, you have to preheat it again, every time.
    We can detect more than one gas, but, keep in mind that it's not a true single gas detection. The chemical resistance inside this sensor react (if heated), to more than one gas, it can not isolate a single gas. So, what you get by conversion, is a resistance value to a ppm value, of many gas. However, if just one gas changed, or the other gases remains almost constant, you can get that changes. If you are able to mantain constant values for all the gas, and modify just one gas, then you can obtain the gas response over the sensor. The builder of this sensor does this job, making the figure i use for gas convertion. You can not be shure you are measuring just one gas.
    Also consider that, the chimical resistance degradate in a few years, I've read somewhere (can't remember well), 2 years.

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