Installation Promag 53 PROFIBUS DP/PA
24 Endress+Hauser
Using and installing grounding rings (DN 2 to 25 / 1/12 to 1")
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 galvanic corrosion of the electrodes.
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Caution!
• Depending on the option ordered, plastic rings may be installed at the process connections
instead of ground rings. These plastic rings serve only as spacers and have no potential
equalization function. In addition, they provide a sealing function at the interface between
the sensor and process connection. For this reason, with process connections without
ground rings, these plastic rings/seals must not be removed, or must always be installed.
• Ground rings can be ordered separately from Endress+Hauser as accessories → 128.
When placing the order, make certain that the ground ring is compatible with the material
used for the electrodes. Otherwise, there is a risk that the electrodes may be destroyed by
galvanic corrosion! Information about the materials can be found on → 177.
• Ground rings, including the seals, are mounted within the process connections. Therefore,
the fitting length is not affected.
1. Loosen the four or six hexagonal headed bolts (1) and remove the process connection
from the sensor (4).
2. Remove the plastic ring (3), including the two O-ring seals (2).
3. Place one 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 (2) in the groove of the ground ring.
6. Finally, mount the process connection on the sensor again. With plastic process
connections, note the max. torques for lubricated threads (7 Nm / 5.2 lbf ft).
a0002651
Fig. 19: Installing grounding rings in the Promag H (DN 2 to 25 / 1/12 to 1")
1 = Hexagonal-headed bolts, process connection
2 = O-ring seals
3 = Grounding ring or plastic ring (spacer)
4 = Sensor
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