Processor Unit – For the Connection of FCS/FCI Product Series Ex Flow Sensors (NAEX) HART Device with Current and Transistor Outputs

Features

• • For Ex ia resp. Ex ib sensors
• • Analog output for flow
• • Transistor outputs for temperature and faults
• • Teaching upper and lower flow limit
• • LED band for indication of flow speed and media temperature
• • Monitoring of operating and display range
• • Detection of wire-break and short-circuit on the sensor side
• • Parametrized via pushbutton and FDT/DTM
• • Associated equipment [Ex ia Ga/Da]
• • Connection of flow probes Zone 0/20

Functional principle

All Ex FCS flow (immersion) and FCI (inline) sensors can be operated with the external processing unit FMX-IM. The flow module features four status LEDs as well as a 10-segment LED band for local monitoring. Software-based diagnostic options are also available to the user, such as wirebreak and short-circuit on the sensor side. Furthermore, monitoring of flow rates and media temperatures within a predefined operating and display range. The upper and lower limit are determined in relation to the analog output signal and implemented in the Teach mode. Working on the calorimetric principle, the connectible sensors not only detect the flow rate but also the media temperature. Parametrization is implemented either via pushbutton or software-supported via HART interface and then via the device specific IODD within the FDT frame PACTware or via SPDU.