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Wiring
26
4.3
Potential equalization
For potential equalization no special measures are necessary.
4.4
Degree of protection
Transmitter
The transmitter meets the requirements for IP 67 degree of protection. Compliance with the
following points is mandatory following installation in the field or servicing, in order to ensure that
IP 67 protection 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 housing screws and screw covers must be firmly tightened.
• The cables used for connection must be of the specified outside diameter → ä 23.
• Firmly tighten the cable entries (→ å 27).
• Remove all unused cable entries and insert dummy plugs instead.
• Do not remove the grommet from the cable entry.
Fig. 27:
Installation instructions for cable entries on the transmitter housing
Flowrate measuring sensors W (clamp-on)
The flowrate measuring sensors W, depending on the type, meet all the requirements for IP 67 or
IP 68 degree of protection (please observe the information on the nameplate of the sensor).
Compliance with the following points is mandatory following installation in the field or servicing,
in order to ensure that IP 67/68 protection is maintained:
• Only use cables supplied by Endress+Hauser with the corresponding sensor connectors.
• The cable connector seals (1) must be clean, dry and undamaged when inserted in the seal groove.
Replace them if necessary.
• Insert the cable connectors, do not cant and then tighten them to the stop.
Fig. 28:
Installation instructions for IP 67/68 degree of protection for sensor connectors
1
Proline Prosonic Flow 91
a0001138
a0001139
Endress+Hauser
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