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 suggest= ions for the right choice. I want to connect my NO2 sensor to an MPS430 for= data monitoring and logging, but i've read some problems about:
Do you know a NO2 sensor (0.5ppm max) that works at 3.3V?
Typically, what is the operative time between two consecutive recalibrat= ions?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
Can you suggest a cheap NO2 sensor that can be easily integrated in my b= oard? Thank you
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 for data monitoring and logging, but i've read some problems about:
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
Surf on "NOx sensor".
The only ones I know of are for automotive applications and work only at high temperatures. ...Jim Thompson
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I love to cook with wine. Sometimes I even put it in the food.
And if they're for automotive, they're for use in the exhaust stream where you could expect much higher concentrations than in ambient air.
--
My liberal friends think I'm a conservative kook.
My conservative friends think I'm a liberal kook.
Why am I not happy that they have found common ground?
Tim Wescott, Communications, Control, Circuits & Software
http://www.wescottdesign.com
Suggestion: if size isn't an issue, see if you can find a surplus sensor for atmospheric monitoring, and if necessary bash it to do what you want.
--
My liberal friends think I'm a conservative kook.
My conservative friends think I'm a liberal kook.
Why am I not happy that they have found common ground?
Tim Wescott, Communications, Control, Circuits & Software
http://www.wescottdesign.com
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 for data monitoring and logging, but i've read some problems about:
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
board?
No easy answers but you might find the following URL helpful.
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Titled: Recommended Methods for Ambient Air Monitoring of NO, NO2, NOy ...
Do you know a NO2 sensor (0.5ppm max) that works at 3.3V?
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
Can you suggest a cheap NO2 sensor that can be easily integrated in my board? Thank you
e2v have a sensor that might fit your requirements if you modify the heater supply for 3.3V
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.
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 for data monitoring and logging, but i've read some problems = about:
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
my board?
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.
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 for data monitoring and logging, but i've read some problems about:
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
board?
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
formatting link
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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