Project Planning
Nivocompact FTC 131
a) Maximum level detection;
Short threaded socket (ideally 25 mm
= half standard length socket).
b) Light build-up on silo wall:
threaded socket welded internally.
The probe tip points slightly
downwards so that material falls off
more easily.
c) Protective roof to protect against
collapsing mounds or high strain on
the rod probe caused by the material
filling curtain with the Nivocompact
FTC 131 used for minimum detection.
d) Threaded socket too long.
Material can settle and lead to error.
e) Error switching caused by high
build-up on the silo wall is best
avoided by mounting the
Nivocompact FTC 231 or FTC 331
with rope probe in the roof of the silo.
f) High strain on the rod probe due to
material run-out;
The Nivocompact FTC 431 with disk
probe is recommended.
Cable gland pointed upwards can
allow moisture to enter.
g) In areas where material can settle,
the instrument cannot recognise an
»empty« silo. The FTC 231 or
FTC 331 is recommended.
This mounting example shows a steel
plate as counter electrode.
Heat insulation prevents condensation
and build-up on the steel plate.
When mounting in a silo made of plastic
material, a sheet metal plate should be
attached to the outside of the silo as a
counter electrode. This plate can be
either square or round. The dimensions
with thin silo walls and low dielectric
constant should be approx. 0.5 m on
each side or ø 0.5 m. This should be
approx. 0.7 m along each side or
ø 0.7 m for silos with thicker walls or for
materials with higher dielectric constants.
The minimum distance required can be
maintained by staggered mounting.
TI133Y04
Metal wall
a)
Short
b)
360
approx.
200
approx.
200
c)
d)
e)
f)
max.
30 Nm
g)
Silo with metal walls
TI133Y06
Plastic wall
Sheet metal plate
Ground connection
Electrical
HF field
Silo with concrete walls
TI133Y07
e.g.
300 mm
e.g.
300 mm
min.
500 mm
TI133Y05
Concrete wall
Sheet metal plate
with threaded
socket
Heat insulation
min. ø 300
or 300
For small differences in
level
Silo with plastic walls
Correct Installation
Incorrect Installation
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