NES
NES K05/0922
page 5
6. Mechanical Connection
The electrodes can for example be screwed into the tank cover and sealed via a
pipe thread. The electrode length corresponds to the desired switching points and
may be shortened as necessary. The electrode tip must be free of insulating
materials. The electrodes must be installed so that the electrode rods or the
pendant electrodes are not short-circuited neither by the side of the tank, nor by
each other. Please ensure that the rods do not bend. The reference or ground
electrode must be at least as long as the longest switching electrode. If the side
of the tank is adequately conductive and is not coated with insulating material, it
can be used as a ground electrode. The clearance between the switching
electrode and the side of the tank should be as small as possible, so that the
conductivity of the measuring distance does not drop below 20
S/cm.
Generally, please note:
The level probes are generally intended for vertical installation.
Short level electrodes, up to approx. 300 mm in length, can be installed in
other positions.
Long level electrodes must be supported if subjected to high lateral loads.
If used in liquids which form a conductive coating on the electrode insulation,
push the spacer away from the end of the electrode insulation by at least
150 mm. This means that you will obtain a high transition resistance with an
uncovered electrode.
When shortening an electrode, please ensure that electrode cladding is not
damaged at other places during the trimming operation. Remove the rod
cladding at the tip of the probe over a length of 3 - 5 mm.
The screw in thread should be sealed with appropriate sealant.
Ensure that the insulation of the rods is not damaged during
insertion of the rods into the flange or the screw-fitting.
