The JA-151ST consists of two independent detectors – an optical smoke detector and a heat detector. The optical smoke detector works on the principle of scattered light. It is very sensitive to large dust particles which are present in dense smoke. It is less sensitive to smaller particles generated by the combustion of liquids such as alcohol. That is why the fire detector also contains a built-in heat detector which has a slower reaction but is much better at detecting fire which generates only a small amount of smoke.
Technical specifications JA-151ST
Power
3 x AA 1.5 V/2.4 Ah alkaline batteries
Typical lifetime
approx. 3 years
Smoke detection
optical light scattering
Smoke detector sensitivity
m = 0.11 - 0.13 dB/m pursuant to EN 14604:2005, EN 54-7
Important is that the design is attractive, because you should not hide fire sensors in any corner etc. This one with its own siren will replace your ordinary smoke detectors - a very good thing.
Carl