IRC-A1 with dual channel pyroelectric detector  is  designed for IAQ, safety, combustion and high CO2 process control applications.

IRC-A1 cover the entire concentration range of measurement, simply implement the appropriate linearisation constants in software for your required range:

IAQ
0 to 5,000ppm CO2

Safety
0 to 5% CO2

Combustion
0 to 20% CO2

Process control
0 to 100% CO2

IRC-A1_datasheet.pdf