VEGA Capacitive electrodes EL 4 … 20 mA - Compact - Manual (Page 17)

Capacitive electrodes EL 4 … 20 mA - Compact 17
22652-EN-020809
Mounting
Fig. 2.1 Lateral load
2 Mounting
2.1 Mounting instructions
General
Different mediums and measurement require-
ments make different installation positions
necessary. Please note the following points.
Lateral load
Make sure that the electrode is not subjected
to strong lateral forces. Mount the electrode in
a position in the vessel where no disturbing
factors, e.g. stirrers, filling openings etc. are
present. This is especially important for very
long rod and cable electrodes.
Downward forces
Strong downward forces, e.g. due to sudden
material inflow or material slide, can cause
high tensile loads.
In such cases, use a rod electrode for short
meas. distances, because a rod is usually
more stable. If, due to the length or the instal-
lation position, a cable electrode is necessary,
the electrode should not be fixed but simply
provided with a gravity weight to allow the
cable to more easily follow the product move-
ments. Make sure that the electrode cable
does not touch the vessel wall.
Pressure
If there is gauge pressure or underpressure
in the vessel, the mounting boss on the thread
must be sealed. Use the attached seal ring.
Check whether the seal ring is resistant
against the medium.
Insulating measures, such as e.g., covering
the thread with Teflon tape, can obstruct the
necessary electrical connection. In such
cases, make sure that the instrument has a
ground connection to the vessel.