I'm looking for a $CO_2$ measuring probe (analog current output, digital out: RS232/485 - probe will be connected and transferring real time data to the data logger) that would operate up to 150 °C (hot air sucked out from the heated column which is highly concentrated by $CO_2$).
Another $CO_2$ probe should measure (rather control) trace amount of $CO_2$ after it's separated from the exhaust gas (small scale experimental boiler burning coal) - operating temp. approx. 75 °C.
I have found tons of probes, but all of them measure up to + 60/65 °C.
Do you have any experiences with such probes?