Conventional CO₂ sensors use an incandescent light source. However, these mid-IR light sources consume lots of power during a lengthy warm-up phase and during operation, making them unattractive especially for retrospective installations, where there is often a lack of an easily accessible power source. All GSS sensors use an in-house designed ultra-efficient LED light source. LEDs are much more efficient in converting electrical power into light than conventional light sources and they do not need the long warm up times suffered by incandescent light sources. The length of time the light source is active is a major contributor to how much power is consumed by the sensor. In a power sensitive application, a GSS CO₂ sensor is typically pulsed on and off to minimise overall power consumption. GSS’s new CozIR® range of sensors have been designed specifically to address applications for measurement of ambient CO₂ levels. These ultra-low power CO₂ sensors are optimised for accuracy in the 0-1% concentration range. They are ideal for battery powered wireless equipment to address the emerging requirements for low cost distributed building management systems (BMS), Demand-Controlled Ventilation (DCV) and Indoor Air Quality (IAQ) systems.