I assume you're using external ADC, in that case:gas sensor with A/D and microcontroller
You are apsolutely right on sensor type. Electrochemical are mostly used in flue gas analyzers (Testo, Draeger,...), I used to maintain/repair Testo analyzersFvM said:I realized, that have mentioned CO measurement in your original post. For CO, the said electrochemical sensors are a rather
simple solution for a low range (ppm) measurement. They have a fair lifetime of 2 to 5 years and are almost selective to CO.
Suitable sensor amplifier circuits can be found e.g. in Citytech application notes.
For a high (percent) range needed in car emission measurement, IR photometers are needed. Citytech and others have ready
made modules (producing digital concentration data) for it, but they are more complex and expensive.
Hm. It's really simple I think. But you can get it much simpler by omitting the external 8-bit ADC and using a PICCoz i have not understood the above schematic.
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