These CO₂ detectors sense and transmit carbon dioxide levels, for use in closed rooms occupied by people to ensure indoor adequate air quality while minimizing the energy costs of conditioning outside air.

It uses a NDIR (Non-Dispersive Infrared) sensor, which includes a microprocessor that adjusts the measure related to daily and historical trends. Output signal: 4 – 20 mA or 0 – 5 VDC proportional to the measured and adjusted value.