Installation
Proline Promag 53 PROFIBUS DP/PA
42
Hauser
Use and installation of ground rings (DN 2 to25)
If the process connections are made of plastic (e.g. flanges or adhesive couplings), the potential
between the sensor and the fluid must be matched 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 electrodes.
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Caution!
• Depending on the option ordered, plastic disks may be installed at the process connections instead
of ground rings. These plastic disks serve only as spacers and have no potential matching 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 disks/
seals must not be removed, or must always be installed.
• Ground rings can be ordered separately from Hauser as accessories (
When placing the order, make certain that the ground rings are compatible with the material used
for the electrodes. Otherwise, there is a risk that the electrodes may be destroyed by
electrochemical corrosion! Information on materials
• Ground rings, including the seals, are mounted within the process connections. Therefore, the
fitting length is not affected.
1.
Loosen the four hexagon head bolts (1) and remove the process connection from the sensor (5).
2.
Remove the plastic disk (3), including the two O-ring seals (2, 4).
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 (4) 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).
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Fig. 24:
Installing ground rings with a Promag H (DN 2 to 25)
1
Hexagon head bolts of the process connection
2
O-ring seals
3
Plastic washer (spacer) or ground ring
4
Sensor
1
3
2
4
2