The SafeAir 250-CO is the next generation of carbon monoxide (CO) detection technology from UTC Fire & Security. The unit uses reliable electro-chemical sensing technology, with a sensor that is unaffected by fluctuations in ambient temperature, and self-diagnostics which keep the device operating optimally. The detector has a built-in trouble/power supervision relay, a long-life, six-year sensor, and if used in a monitored configuration, transmits sensor end-of-life to the control panel and central station.