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Wiring
"
!
66
4.4.2
Special cases
Metal, ungrounded piping
In order to prevent outside influences on measurement, it is advisable to use ground cables to
connect each sensor flange to its corresponding pipe flange and ground the flanges. Connect the
transmitter or sensor connection housing, as applicable, to ground potential by means of the ground
terminal provided for the purpose (see Figure).
The ground cable for flange-to-flange connections can be ordered separately as an accessory from
Endress+Hauser → Page 133:
Caution!
Also, observe company-internal grounding guidelines.
Note!
• DN ≤ 300: The ground cable is in direct connection with the conductive flange coating and is
secured by the flange screws.
• DN ≥ 350: The ground cable connects directly to the metal transport bracket.
Fig. 39:
Potential matching with equalizing currents in metallic, non-grounded piping systems
6 mm² Cu
£
DN
300
Proline Promag 53 PROFIBUS DP/PA
³
DN
350
Endress+Hauser
a0004376
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