The FlexADOS 914 LON is ADOS's multi-channel gas detection controller for continuous ambient air monitoring in industrial and infrastructure environments. It supervises up to 60 digital LON bus sensors — TOX 914 LON for toxic gases, LCTR 404 LON for combustible gases — on a single 4-wire loop, with menu-guided setup via a 6-button keypad and plain-text LCD display. Certifications include VDI 2053, EN 50545, EN 50271 (SIL 1), and optional DNV-GL marine classification for the MED variant.

How does the LON bus sensor network operate?

LON (Local Operating Network) bus technology provides digital communication between the controller and each sensor over a simple 4-wire connection — two for power, two for data. Unlike analog 4–20 mA loops where the controller only receives a current value, LON bus sensors transmit their measured value, diagnostic status, and calibration data digitally. The FlexADOS 914 LON polls all 60 sensors continuously, displaying actual values, mean values over 1–60 minute averaging periods, and individual fault conditions in plain text. Two fan area levels can be displayed for ventilation control in underground carparks and tunnels.

What alarm and relay configuration options are available?

Each of the 60 sensors supports five independently adjustable alarm thresholds, settable from 10% to 90% of the measuring range. Alarm relays — up to 14 potential-free changeover contacts rated 250 V / 8 A — can be configured across two alarm levels, expandable to six levels total. Three dedicated relays cover malfunction, power failure, and maintenance signaling. A 3-level averaging function (1–60 minutes) prevents false alarms from transient gas concentration spikes.

What BMS and fieldbus integration options are supported?

Two 4–20 mA analog outputs with a maximum burden of 400 Ω provide standard integration with PLC and DCS systems. An optional universal fieldbus module adds LONWorks, Modbus RTU, Modbus TCP, or Profibus DP connectivity for building management system (BMS) integration. A standard USB port and front-panel infrared interface support local configuration and data download. An uninterruptible power supply (UPS) connection option ensures continued monitoring during mains failure.