3 Installation Promag 53 PROFIBUS-DP/-PA
38 Endress+Hauser
Usage and assembly of ground rings (DN 2...25)
In case the process connections are made of plastic (e.g. flanges or adhesive fittings),
the potential between the sensor and the fluid must be equalised using additional
ground rings.
If the ground rings are not installed this can affect the accuracy of the measurements or
cause the destruction of the sensor through the electrochemical erosion of the elec-
trodes.
Caution:
At the factory, plastic rings will be inserted in the process connections instead of the
ground rings. These are only intended as “placeholders” and do not provide potential
equalisation.
Before installing the ground rings, please observe the following points:
• ground rings can be ordered separately from E+H as accessories (see Page 111).
– When placing the order, make certain the included o-ring seals are of the same
material as the seals that are used for the process connections.
– When placing the order, make certain that the grounding ring is compatible with the
material used for the electrodes. Otherwise, there is a risk that the electrodes may
be destroyed by electrochemical corrosion! Information about the materials can be
found on page 137.
• The dimensions of the ground rings can be found on page 167.
• ground rings, including the seals, are mounted within the process connections. There-
fore, the fitting length is not affected.
• For plastic flange connections, ground disks, which are mounted between the
flanges, can be used instead of ground rings.
1. Loosen the four hexagonal headed bolts (1) and remove the process connection
from the sensor (5).
2. Remove the plastic disk (3), including the two o-ring seals.
3. Place the new seal (2) in the groove of the process connection.
4. Place the metal ground ring (3) on the process connection.
5. Now place the second seal (4) in the groove of the ground ring.
6. Finally, mount the process connection on the sensor again.
Fig. 22: Installing ground rings with a Promag H (DN 2...25)
1 Hexagonal headed bolts (process connection)
2 O-ring seal for the process connection
3 Plastic disk (placeholder) or ground ring
4 O-ring seal for the ground ring
5 Sensor Promag H
1
3
4
5
2
F06-xxHxxxxx-17-xx-xx-xx-001
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