FEP630, FEH630
ELECTROMAGNETIC FLOWMETER | CI/FEP630/FEH630-EN REV. D
27
Mixed system, piping with cathodic corrosion potential and
functional ground potential
G11048
1
2
1
A
2
3
B
B
B
B
A
Connection line corrosion
potential*
B
Insulated screw bolts without
grounding plates
1
Insulated piping
2
Uninsulated metal piping
3
Functional ground
*
â
4 mm
2
Cu, not included in the delivery, to be provided on-site
Figure 35: Sensor with functional ground
This mixed system has an insulated piping with corrosion
protection potential and an uninsulated metal pipe (L = ¼ × DN
sensor) with functional ground potential upstream and
downstream of the sensor.
Figure 35 shows the preferred installation for cathodic corrosion
protection.
Power supply
Note
• Adhere to the limit values of the power supply in accordance
with the information on the name plate.
• Observe the voltage drop for large cable lengths and small
conductor cross-sections. The voltage at the terminals of the
device may not down-scale the minimum value required in
accordance with the information on the name plate.
The power supply is connected to terminal L (phase), N (zero), or
1+, 2
Æ
, and PE.
A circuit breaker with a maximum rated current of 16 A must be
installed in the power supply line.
The wire cross-sectional area of the power supply cable and the
circuit breaker used must comply with VDE 0100 and must be
dimensioned in accordance with the current consumption of the
flowmeter measuring system. The cables must comply with
IEC 227 and/or IEC 245.
The circuit breaker must be located near the device and marked
as being associated with the device.
Connect the transmitter and sensor to functional earth.
