Kobold NRM, Operating Manual

Page: 6 / 52

NRM
page 6 NRM K06/0422
6. Installation
6.1 Mounting
When choosing the installation place please ensure proper space for later
calibrations, verification or maintenance service.
PLACEMENT
The ideal position for the NRM is on the
r = (0.3 … 0.5) R (in case of cylindrical tank).
It is highly recommended to consider the beam
cone. The distance between the sensor and the
tank wall should be at least 200 mm.
If the unit is installed into dome top or spherical
tank, unwanted multiple reflections may appear,
which can cancel each other and the measuring
signal out, this way it can interfere the
measurement.
r
R
MOVING LIQUID SURFACE
Waving, vortex or strong vibration effects can
have negative influence on the measurement
accuracy and the maximal measuring range. To
avoid these effects, the mounting placement
should be as far as possible from the sources of
these
disturbing effects. According to
measurement experiences the maximal
measuring distance may decrease by 50-70%
when the liquid surface is vortexing. For this
reason the device should be mounted as far as
possible from the filling stream or the tank outlet.
FOAMING
Filling, stirring or any other
processes in the tank can generate
dense foams on the liquid surface,
which may considerably damp the
reflected signals.
According
to measurement
experiences, in these cases the
maximal
measuring distance
decreases at least approximately
by 50%.
FUMES, VAPOURS
If the measured medium or its
foam can reach the antenna
or the measured medium is
highly fuming, these cases
build-ups can form on the
sensor, which may result
unreliable
level
measurement.