Proline Promag 55 FOUNDATION Fieldbus
Wiring
Hauser
49
Special cases
Operating conditions
Potential equalization
When using the measuring device in:
• metallic, ungrounded piping
This type of connection occurs when:
• the usual potential equalization cannot be guaranteed
• extremely high equalizing currents are expected
A ground cable (copper wire, at least 6 mm² (0.0093 in
2
)) is used
to connect both sensor flanges to the respective pipe flange and
to ground them. Connect the transmitter or sensor connection
housing, as applicable, to ground potential by means of the
ground terminal provided for this purpose.
The installation of the ground cable depends on the nominal
diameter:
• DN
≤
300 (12"): The ground cable is in direct connection
with the conductive flange coating and is secured by the
flange screws.
• DN
≥
350 (14"): The ground cable connects directly to the
metal transport bracket.
!
Note!
The ground cable for flange-to-flange connections can be
ordered separately as an accessory from Hauser.
A0011893
Fig. 34:
Via the transmitter's ground terminal
and the pipe flanges
Version with pre-installed ground cable for DN
≤
300 (12")
(order option)
Ground cables (copper wire, min. 6 mm² (0.0093 in
2
)), which
are pre-installed on the sensor flange, are also optionally
available. These ground cables can be secured and connected
electrically to the piping in different ways:
• Using a screw on the side of the pipe flange (a)
• Using the flange screws (b)
• Using a pipe clip installed around the pipe (c)
A0011897
Fig. 35:
Possibilities for connecting and
securing preinstalled ground cables
When using the measuring device in:
• plastic pipes
• isolating lined pipes
This type of connection occurs when:
• the usual potential equalization cannot be guaranteed
• extremely high equalizing currents are expected
Potential equalization takes place using additional ground disks,
which are connected to the ground terminal via a ground cable
(copper wire, min. 6 mm² (0.0093 in
2
)). When installing the
ground disks, please comply with the enclosed Installation
Instructions.
A0011895
Fig. 36:
Via the transmitter's ground terminal
and the optionally available ground
disks
DN
300
DN
350
a
b
c