Series 65 Integrating detector use a low activity radioactive foil to detect fires by irradiating the air in the smoke chamber, the current flow is reduced leading to an alarm. Circuitry in the Integrating Ionisation Smoke Detector protects against transient levels of smoke above the normal threshold for up to 20 Seconds.
Responds well to fast burning, flaming fires
Designed to operate in environments where transient levels of smoke may be expected
LED illuminates when detector changes to alarm state