Wiring
Promag 50
54
Hauser
4.3.4
Exampels for potential equalization connections for Promag D
Standard
case
Special cases
Operating conditions
Potential equalization
When using the measuring device in a:
• Metal, grounded pipe
• Plastic pipe
• Pipe with insulating lining
Potential equalization takes place via the ground terminal of the
transmitter (standard situation).
!
Note!
When installing in metal pipes, we recommend you connect the
ground terminal of the transmitter housing with the piping.
a00012172
Fig. 39:
Via the ground terminal of the
transmitter
Operating conditions
Potential equalization
When using the measuring device in a:
• Metal pipe that is not grounded
This connection method also applies in situations where:
• Customary potential equalization cannot be ensured
• Excessively high equalizing currents can be expected
Potential equalization takes place via the ground terminal of the
transmitter and the two pipe flanges.
Here, the ground cable (copper wire, 6 mm² (0.0093 in
)) is
mounted directly on the conductive flange coating with flange
screws.
a00012173
Fig. 40:
Via the ground terminal of the
transmitter and the flanges of the pipe .
When using the measuring device in a:
• Pipe with a cathodic protection unit
The device is installed potential-free in the pipe.
Only the two flanges of the pipe are connected with a ground
cable (copper wire, 6 mm² (0.0093 in
)). Here, the ground cable
is mounted directly on the conductive flange coating with flange
screws.
Note the following when installing:
• The applicable regulations regarding potential-free installation
must be observed.
• There should be
no
electrically conductive connection
between the pipe and the device.
• The mounting material must withstand the applicable
torques.
a00012174
Fig. 41:
Potential equalization and cathodic
protection
1
Power supply isolation transformer
2
Electrically isolated
2
2
1
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