Flow monitoring, for connecting Ex flow sensors of the FCS/FCI (NAEX) series, HART device with current and transistor outputs, operating voltage 20.30 VDC, for Ex ia or Ex ib sensors, analog output for flow, transistor outputs for temperature and errors, teaching of upper and lower flow limits, 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, parameterization via touch button and FDT/DTM, associated equipment [Ex ia Ga/Da], connection of flow probes zone 0/20