Apollo Discovery Carbon Monoxide Fire Detector contain a long-life electro-chemical carbon monoxide sensor which is tolerant of low levels of common vapours and household products. The sensing technology is fast, accurate and needs only very low power. The detection capabilities are enhanced by a rate-sensitive response. Fast rises in the carbon monoxide level are often associated with hot fires and the detector will respond earlier under these conditions. The analogue reply from the detector is rate limited to remove nuisance alarms resulting from short-term high levels caused by sources such as pipe smokers or gas flame ignition. It offers effective false alarm management by a combination of EN 54 approved operating modes and sophisticated algorithms. The Discovery CO detector has five operating modes, each having a set combination of sensitivity and response delay, which the user can select for any given application. Suitable for supplementing smoke detection when there is a deep-seated smouldering fire risk, a risk of fire starting in an enclosed space, the main risk is smouldering fires.