PROline Promag 53 3 Installation
Endress+Hauser 39
Usage and assembly of ground rings (1/12" to 1" / DN 2 to 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 equalized 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:
• Depending on the option ordered, plastic disks may be installed at the process con-
nections instead of ground rings. These plastic disks 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 disks/seals must not be removed, or
must always be installed.
• Ground rings can be ordered separately from E+H as accessories (see Page 97).
When placing the order, make certain that the ground ring is compatible with the mate-
rial 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 131.
• Ground rings, including the seals, are mounted within the process connections.
Therefore, the fitting length is not affected. The dimensions of the ground rings can be
found on Page 156.
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 (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 PVDF: 2.4 ft-lbs/3.3 Nm; for PVC: 7.4 ft/lbs/
10 Nm).
Fig. 21: Installing ground rings with a Promag H (1/12" to 1" / DN 2 to 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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