Discovery Ionisation Smoke Detector

Product Overview

The Discovery Ionisation Smoke Detector uses a low activity radioactive foil to irradiate the air in the smoke chamber causing a current flow. If smoke enters the chamber, the current flow is reduced leading to an alarm.


  • Responds well to fast-burning, flaming fires.
  • Designed to operate in a variety of environments.
  • Remote test feature.


Approvals: EN54-7/LPCB


Voltage 17-28 VDC
Quiescent Current 500µA at 24 VDC
Alarm Current 3.5mA at 24 VDC
Size (inc Base) 100mm Dia x 50mm H
Operating Temperature 20°C to +60°C (no icing)
Relative Humidity 0 to 95% (non condensing)
IP Rating IP43
Weight (inc base) 160 grams


Item Numbers

58000-500AMP Discovery Ionisation Smoke Detector