Proline Promag 55 PROFIBUS DP/PA Installation
Endress+Hauser 29
Usage and assembly of ground rings (DN 2 to 25 / 1/12 to 1")
In case 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 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 ä 120. 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 electrochemical
corrosion! Information about the materials can be found on ä 152.
• 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. 21: Installing ground rings with a Promag H (DN 2 to 25 / 1/12 to 1")
1 Hexagonal headed bolts (process connection)
2 O-ring seals
3 Ground ring or plastic ring (placeholder)
4Sensor
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