FEP630, FEH630 ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D 33Mixed system, piping with cathodic corrosion potential andfunctional ground potentialG11048121A23BBBBA Connection line corrosionpotential*B Insulated screw bolts withoutgrounding plates1 Insulated piping2 Uninsulated metal piping3 Functional ground* ≥ 4 mm 2 Cu, not included in the delivery, to be provided on-siteFigure 40: Sensor with functional groundThis mixed system has an insulated piping with corrosionprotection potential and an uninsulated metal pipe (L = ¼ × DNsensor) with functional ground potential upstream anddownstream of the sensor.Figure 40 shows the preferred installation for cathodic corrosionprotection.Power supplyNote• Adhere to the limit values of the power supply in accordancewith the information on the name plate.• Observe the voltage drop for large cable lengths and smallconductor cross-sections. The voltage at the terminals of thedevice may not down-scale the minimum value required inaccordance with the information on the name plate.The power supply is connected to terminal L (phase), N (zero), or1+, 2−, and PE.A circuit breaker with a maximum rated current of 16 A must beinstalled in the power supply line.The wire cross-sectional area of the power supply cable and thecircuit breaker used must comply with VDE 0100 and must bedimensioned in accordance with the current consumption of theflowmeter measuring system. The cables must comply withIEC 227 and/or IEC 245.The circuit breaker must be located near the device and markedas being associated with the device.Connect the transmitter and sensor to functional earth.
