Proline Promag 50P, 53P
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 (1/2" to 12" / DN 15 to 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 31.
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.
A0004377
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
piping runs (copper wire, 9 AWG / 6 mm
2
).
• 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.
A0004378
1 = isolation transformer, 2 = electrically isolated
9 AWG (6 mm² Cu)
9 AWG Cu
1
22
To Next Page
Loading...
