Searching for O2 Sensor (specs in thread)

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An individual is seeking affordable oxygen sensors suitable for installation in a household chimney, with a budget of under $150, excluding shipping. The desired sensors must be resistant to soot, accurate within half a percent of oxygen concentration, and operate between 50 C and 500 C, while also handling moisture. Additionally, there is a need for a carbon monoxide sensor that can measure accurately on a parts per million scale under similar conditions. Suggestions include checking Alibaba for bulk purchasing options, as well as other online resources. The focus is on finding rugged sensors that can withstand extreme soot buildup rather than prioritizing accuracy.
Hypnotist56
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Hey guys -
I've been looking to find an oxygen sensor that fits certain criteria. I've been looking through oxygen sensors on Google and I can't really figure out what kinds of inexpensive oxygen sensors are available that aren't meant to go inside car exhausts. I would really appreciate it if someone here could help me in this regard, or at least post a link to a website that sells sensors which might peddle the kind of sensor I'm looking for! I'm looking to buy just a few now, but in the future, if all goes well, I might be ordering a few thousand.

Criteria:
Reasonable price (less than $150, excluding shipping, except if shipping costs more than $25)
Resistant to and unaffected by soot; sensor will be placed in a house hold chimney and should be well suited to EPA standards of soot in chimney smoke.
Sensor's readings should be accurate to within half a percent oxygen concentration in air, or more accurate
Sensor's operating temperature must be between 50 C and 500 C (i.e, a sensor that operates at 200 C to 300 C is just fine - we can adjust where we place the sensor in the chimney to allow for temperature adjustment near sensor position)
Oxygen sensor will have to deal with the moisture present in a house hold chimney (

Accuracy isn't as important as being rugged and resistant to extreme soot build up.

I'm also looking for a carbon monoxide sensor - this would operate in the same conditions as above, but accuracy obviously needs to be much more accurate - measuring on a ppm scale seems to be a good idea for our application.

Thanks so much!
 
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