Esser 802379 IQ8Quad OTblue-LKM Isolated Duct-Type Multisensor Detector

It is an addressable IQ8Quad detector from Honeywell's Esser brand; it combines optical and heat sensors in a single housing and carries an integrated isolator. The measurement chamber features a high-sensitivity blue LED instead of red; even flaming fires are detected without requiring a radioactive source. It mounts on 781443 and 781463 venturi duct modules and reads duct air flowing at 1-20 m/s speeds. It is VdS approved and early stops the spread of smoke to other floors in air handling units.