• Q:How does LPG gas leackage sensor works?

    A: Generally an LPG sensor works like a combustable gas sensor in that it is sensitive to not just LPG but other flamable gases as well. (Natural, Methane, Coal gas, butane etc...) It works by comparing a change in resistance between two heated elements. One heated element is a reference that is isolated from the sample gas. The other element is identical except that it is exposed to the sample. 

    Catalytic oxidation of the target gas contained in the sample causes an increase in heat and a corresponding change in resistance. The two heated resistive elements are part of a balanced wheatstone bridge. The changes in resistance between these cause an imbalance in resistance and a change in current flow in the bridge that can be measured as a voltage. 

    The voltage can then be measured by an ADC and computed into a ppm value by a microcontroller for display.

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