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The connection to the sensor electrodes is made by the 2-pole connector X3 and a coaxial cable.
According to the drawing (see Figure 1), the core is connected to the left terminal X3/1 (measuring
electrode) and the shield to the right terminal X3/2 (opposite electrode).
2.2
Sensor Electrodes
Figure 2
Basically: Narrow sensor electrodes → small switching hysteresis
wide sensor electrodes
→ large switching hysteresis
The sensor electrodes can have any geometric shape. It is only important that the two elec-
trodes have approximately the same area and are fixed to a grounded structure.
Measurement
electrode
A :
The measurement electrode is connected
to X3/1 of the evaluation unit via the core
conductor of the coaxial cable.
The measurement and
opposite electrodes must
be made of conductive
material (sheet steel, alu-
minum, etc.). They should
have the same design.
Opposite Electrode B :
The opposite electrode is connected to
X3/2 of the evaluation unit via the shield of
the coaxial cable.
Montage structure C :
The design of the mounting structure depends on the conditions at the
installation place. It must be made of conductive material (metal, for fur-
ther examples see above).
The mounting structure must be connected to the earth potential!
Spacers
D :
The spacers must be made of electrically isolating material (plastic / ce-
ramic, see table below).
Construction Rules
min.
max.
Info
Electrodes wide
a
10 mm
200 mm
Spacer diameter, Ø
b
no specifi-
cation
no specifi-
cation
Electrically isolating material (plastic / ce-
ramic).
The selected diameter must ensure suffi-
cient mechanical stability.
Spacers are available as accessories from
UNICONTROL (UC spacer M4, M6, M10
and M12.
Electrodes gap
c
5 mm
80 mm
Material Mechanical
Capacity
d
no specifi-
cation
no specifi-
cation
The material mechanical capacity is not crit-
ical. It should be chosen considering that
the electrodes have enough mechanical sta-
bility.
Electrodes length
l
20 mm
4000 mm
The sensor electrodes can have any geometric shape. It is important that the two electrodes
have approximately the same areas.
