Pyreos linear IR arrays (spectrometers-on-a-chip) can be used for wide-spectrum detection of different gas species in flues, and you can build lower-cost sensors with ultra-high resolution for discrete gases by using our singles, duals and quads.  Our products are the fastest available giving higher resolution and lower power consumption. There is no “warm-up” time. There are no moving parts so customer systems can be more robust. The range continues to expand so contact us if you have different needs.