DURÁN toxic, explosive gas and oxygen detection panel, 3 zones, expandable to 4 zones. industrial use, up to 16 detectors per zone. 4 ventilation groups. 4 relay outputs per zone, compatible with analogue detectors and rs485. lcd display, optical/acoustic indicators and auto-configuration of detectors/gases. can detect up to four different gases (toxic, explosive or oxygen) simultaneously, remote relay modules and 4-20ma to rs48 conversion modules