Promag CON-485 Series Informations techniques télécharger pdf (Page 12)

Proline Promag 50W, 53W

12 Endress+Hauser

Plastic pipes and isolating lined pipes

Normally, potential is matched using the reference electrodes in the measuring tube. However, in exceptional

cases it is possible that, due to the grounding plan of a system, large matching currents flow over the reference

electrodes. This can lead to destruction of the sensor, e.g. through electrochemical decomposition of the elec-

trodes. In such cases, e.g. for fibre-glass or PVC piping, it is recommended that you use additional ground disks

for potential matching.

When using ground disks, note the following points:

• Ground disks (DN 15...300) can be ordered separately from Endress+Hauser as an accessory.

• Ground disks (incl. seals) increase the installation length. You can find the dimensions of ground disks on

Page 30.

Caution!

• Risk of damage from electrochemical corrosion. Note the electrochemical insulation rating, if the ground

disks and measuring electrodes are made of different materials.

• Also, observe company-internal grounding guidelines.

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Pipes with cathodic protection

In such cases, install the measuring instrument without potential in the piping:

• When installing the measuring device, make sure that there is an electrical connection between the two pip-

ing runs (copper wire, 6 mm

• Make sure that the installation materials do not establish a conductive connection to the measuring device

and that the installation materials withstand the tightening torques applied when the threaded fasteners are

tightened.

• Also comply with the regulations applicable to potential-free installation.

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1 = isolating transformer, 2 = electrically insulated

6 mm² Cu

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Promag CON-485 Series Informations techniques Page 12