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Member Since: August 13, 2010

Country: United States

  • Anyone use the readings to measure CH4 in ppm? I am trying to understand how to do the conversion from the datasheet, but do not see how to get the equation. I assume it is linear over the entire range, what is confusing me is why does the sensitivity graph show the characteristics for 7 different gases? Does the conversion need to account for the contribution of each of those 7 gases to determine the actual concentration of CH4? Also, shouldn’t the datasheet say what is the expected resistance at 1000ppm at room temp or something so you can extrapolate from there? It lists a range of 10k to 60k, which seems really wide. The datasheet says it can detect from 200-10000ppm, so seems like you should be able to measure in ppm, right?

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