Promag 50/53 W
Hauser
11
Metallic, ungrounded pipes
In order to avoid errors in measurement, use grounding cables to connect each
sensor flange to its corresponding pipe flange and ground the flanges. Connect the
transmitter or sensor connection housing, as applicable, to ground by means of the
grounding terminal provided for that purpose.
Note:
The grounding cable for flange-to-flange connections can be ordered separately as
an accessory from Hauser.
•
≤
12”; the grounding cable is in direct connection with the conductive flange
coating and is secured by the flange screws.
•
≥
14”, the grounding cable connects directly to the metal transport bracket.
Plastic pipes and 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 fiberglass or PVC piping, it is recommended that you
use additional ground disks for potential matching.
When using ground disks, not the following points:
•
Ground disks (1” to 12”) can be ordered from Hauser as an accessory
•
Ground disks (including seals) increase the installation length. Refer to the
disk dimensions on page 22.
Caution:
Risk of damage by electrochemical corrosion. Note the electrochemical insulation
rating if the grounding rings and measuring electrodes are made of different materi-
als.
Observe the plant internal grounding guidelines.
9 AWG Cu
9 AWG Cu
