CO2 Sensor

[O2Addict]

Does anyone know of a decent CO2 sensor. The only ones I can find are IR Radiation based devices is this normal?

Let me know if anyone has an ideas, it is just for a surface gas analyser.

Thanks

 

[Otter]

Hmm...wasnt aware that there were CO2 sensor....guess you learn something every day.

 

[madmole]

For surface use look in any big gardening centre. They are used a lot in greenhouse monitoring and are fairly cheap

All the cheaper ones use IR though which means they wont work in a loop (the water molecules defract the light more than the CO2 does) and need big power supplies