Potential Equalisation; Degree Of Protection - Endress+Hauser PROline prosonic flow 90 Operating Instructions Manual

4 Wiring
!
38
4.3

Potential equalisation

For potential equalisation no special measures are necessary.
Note!
For instruments for use in hazardous areas, observe the corresponding guidelines in the
specific Ex documentation.
4.4

Degree of protection

Transmitter (wallmount housing)
The transmitter fulfills all 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:
x The housing seals must be clean and undamaged when inserted into their grooves.
The seals must be dried, cleaned or replaced if necessary.
x All threaded fasteners and screw covers must be firmly tightened.
x The cables used for connection must be of the specified outside diameter
(see Page 91).
x Firmly tighten the cable entries (Fig. 38).
x Remove all unused cable entries and insert dummy plugs instead.
x Do not remove the grommet from the cable entry.
Fig. 38: Installation instructions for cable entries on the transmitter housing
Flowrate measuring sensors W (Clamp on / Insertion)
The flowrate measuring sensors W, depending on the type, fulfill all the requirements for
IP 67 or 68 degree of protection (please observe the informations 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:
x Only use cables supplied by E+H with the corresponding sensor connectors.
x The cable connector seals (1) must be clean, dry and undamaged when inserted in
the seal groove. Replace them if necessary.
x Insert the cable connectors, do not cant and then tighten them to the stop.
Fig. 39: Installation instructions for IP 67/68 degree of protection for sensor connectors
1
PROline Prosonic Flow 90
Endress+Hauser