Flow monitoring, for connecting Ex flow sensors of the FCS/FCI (NAEX) series, IO-Link device with transistor outputs, operating voltage 20.30 VDC, for Ex ia or Ex ib sensors, transistor outputs for flow, temperature and error, switching point setting without teaching the flow limits (QuickTeach), LED strip for displaying flow velocity and media temperature, monitoring of the working and display range, wire break and short circuit detection on the sensor side, operation optionally in standard IO or IO-Link mode, parameterization via touch button and software-supported via IO-Link, associated equipment [Ex ia Ga / Da], connection of flow probes zone 0 / 20