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Suggestions for a NO2 sensor

Discussion in 'Electronic Design' started by [email protected], Aug 28, 2012.

  1. Guest

    Hi all,
    i want to implement a NO2 sensor (for measuring traffic exhausted gas in a street) in my project: i'm totally new in this field so i need some suggestions for the right choice. I want to connect my NO2 sensor to an MPS430 fordata monitoring and logging, but i've read some problems about:
    1. Do you know a NO2 sensor (0.5ppm max) that works at 3.3V?
    2. Typically, what is the operative time between two consecutive recalibrations?How can i calibrate it? I know that it depends from technology, but i'm looking for a sensor with a long operative time between recalibrations. I'm doing an hobby project that doesn't need to be certified
    3. Can you suggest a cheap NO2 sensor that can be easily integrated in my board?
    Thank you
     
  2. Martin Brown

    Martin Brown Guest

    No easy answers but you might find the following URL helpful.

    http://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=910004V2.txt

    Titled: Recommended Methods for Ambient Air Monitoring of NO, NO2, NOy ...
     
  3. PeterD

    PeterD Guest

    And there would need to be some way to determine the source of the NOx...
     
  4. iiiijjjj

    iiiijjjj Guest

    That sounds non-trivial unless you can buy a commercially made sensor somewhere. It sounds like you will have to take a trip to laser/spectroscopy land to do what you want to do.
     
  5. josephkk

    josephkk Guest

    Gosh, are you crazy lazy? Pick a search engine and feed it "no2 sensor".
    If you are price sensitive add price. BTW i had to search this for my
    job a couple years back and it was no problem finding them then. Also had
    to look up CO sensors, CO2 sensors, NO sensors, CH4 sensors, and several
    others. Tunneling project.

    ?-)
     
  6. Nemo

    Nemo Guest

    Use an electrochemical NO2 sensor from City Technology (part of
    Honeywell) or E2V or AlphaSense or possibly Sensoric. There are other
    manufacturers. Count on spending about $40+ on the sensor. Quite
    possibly available from catalogues like Farnell and Digikey. The
    sensors' responses are practically DC - they take many seconds to
    respond, this is useful as it smooths out the usual noise.

    The sensors used in car exhaust analysers are big chunky things but for
    a street side monitor in relatively benign conditions you can get away
    with a small one about the size of half your thumb. Don't solder to the
    contacts, that will destroy the electroytes inside, use a socket (you'll
    need 3 single pin sockets).

    You will need a circuit to drive it (see the www.alphasense.com site's
    app notes). Zeroing is done in clean air. I think your main problems
    will be calibration - you will need some way of figuring out its
    sensitivity, unless what you're interested in is relative
    concentrations; and weatherproofing it, which you can probably do using
    gore-tex fibre and lots of glue.

    The sensors last 1-2 years. 0.5ppm max is a tough call - they're usually
    designed to warn of near-toxic levels, about 10 or 50 times that.
     
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