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How Sensitive? — Parallax Forums

How Sensitive?

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  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-11-21 16:23
    Bathroom or barn? (Hey. Just curious.)

    -Phil
  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-11-21 16:43
    Sure, I'll read the datasheet for you Jeff.

    It looks like the methane sensor is good for detecting concentrations from 5000ppm to 20000ppm.
  • mindrobotsmindrobots Posts: 6,506
    edited 2011-11-21 17:09
    Hmmmm...and so close to The Holidays!

    It's really cool that you can set it to go off when a preset level has been EXCEEDED.
  • Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
    edited 2011-11-21 17:53
    I saw the datasheet.. I was a little more interested in measuring lower amounts...

    OBC
    Duane Degn wrote: »
    Sure, I'll read the datasheet for you Jeff.

    It looks like the methane sensor is good for detecting concentrations from 5000ppm to 20000ppm.
  • Oldbitcollector (Jeff)Oldbitcollector (Jeff) Posts: 8,091
    edited 2011-11-21 17:54
    More along the level of "Who dunnit?"
    Phil Pilgrim (PhiPi) wrote: »
    Bathroom or barn? (Hey. Just curious.)

    -Phil
  • PublisonPublison Posts: 12,366
    edited 2011-11-21 17:56
    I see a project for a Quadrover in the brew. :)
  • ElectricAyeElectricAye Posts: 4,561
    edited 2011-11-21 17:56
    I can't speak for that particular sensor but my friends hosted a chili cook-off in their house one night and, suddenly, the gas alarm went off. The alarm was one of those types you plug into the wall outlet and it's going off was a real mystery to the contestants until people cleared the area around it. The tell-tale smell said it all.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-11-21 19:17
    I figured I was (purposefully) misreading your inquiry. I thought I'd pretend to be nice.

    I almost asked about what you wanted to measure. I'm a chemist but this not my area of expertise.

    The problem is, I'm pretty sure the smell is not related to the amount of methane. There are also other gasses involved. If someone drinks a lot of carbonated beverages they might be the culprit without setting off any methane detectors.
  • ElectricAyeElectricAye Posts: 4,561
    edited 2011-11-21 19:45
    Duane Degn wrote: »
    ...

    The problem is, I'm pretty sure the smell is not related to the amount of methane....

    I'm sure you're right about that. But I know my own gas detector goes off when I use floor cleaner too close to it, floor cleaner that has some kind of aromatic compound in it. So I'm just guessing a lot of these sensors are probably sensitive to all sorts of hydrocarbons and not just what they are specified for.
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