4 Wiring Promass 40
20 Endress+Hauser
4.2 Potential equalisation
No special measures for potential equalisation are required.
Note:
For instruments for use in hazardous areas, observe the corresponding guidelines in the
specific Ex documentation.
4.3 Degree of protection
The devices fulfill all the requirements for IP 67. Compliance with the following points is
mandatory following installation in the field or servicing, in order to ensure that IP 67 pro-
tection is maintained:
• The housing seals must be clean and undamaged when inserted into their grooves.
The seals must be dried, cleaned or replaced if necessary.
• All threaded fasteners and screw covers must be firmly tightened.
• The cables used for connection must be of the specified outside diameter
(see Page 51).
• Firmly tighten the cable entries (Fig. 13).
• The cables must loop down before they enter the cable entries (“water trap”, Fig. 13).
This arrangement prevents moisture from penetrating the entry. Always install the
measuring device in such a way that the cable entries do not point up.
• Remove all unused cable entries and insert plugs instead.
• Do not remove the grommet from the cable entry.
Fig. 13: Installation instructions, cable entries
F06-xxxxxxxx-04-xx-xx-xx-005
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