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



17-28 VDC

Quiescent Current

500?A 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


Weight inc base

160 grams

Item Numbers


Discovery Ionisation Smoke Detector