The ASD 535 contains a smoke sensor with new HD (High Dynamic) technology: dynamic temperature and soiling compensation ensure previously unattained security of detection, as do the enlarged detection chamber with a high-power LED. The smoke particle measurement sensitivity can be selected from a minimum of 0.002%/m and a maximum of 10%/m. With the strongest fan on the market, large areas can be monitored than was previously possible. Wither IT systems, theatre auditorium or airport - the ASD 535 detects all premises and areas precisely and with a noise-optimised fan. It sensitively scales itself automatically and differentiates between smoke particles and dirt. False alarms are practically impossible.