VEGA VEGAPULS 41 Profibus PA - Manual (Page 13)

VEGAPULS 41 – Profibus PA 13
27292-EN-041227
Mounting and installation
Measuring range (operating range) and max. measuring distance
Note: Use of the sensors for applications with solids is limited.
2 Mounting and installation
2.1 General installation instructions
Profile with smooth interfering surfaces cause large
false signals
Round profiles diffuse radar signals
Cover smooth, flat surface with deflectors
False echoes
Flat obstructions and struts cause strong
false echoes. They reflect the radar signal
with high energy density.
Interfering surfaces with rounded profiles
scatter the radar signals into the surrounding
space more diffusely and thus generate false
echoes with a lower energy density. Hence,
those reflections are less critical than those
from a flat surface.
If flat obstructions in the range of the radar
signals cannot be avoided, we recommend
diverting the interfering signals with a deflec-
tor. The deflector prevents the interfering
signals from being directly received by the
radar sensor. The signals are then so low-
energy and diffuse that they can be filtered
out by the sensor.
full
Meas. range
Reference plan
empty
max.
max.
min.
Measuring range
The reference plane for the
measuring range of the sensor
is the lower edge of the flange.
Keep in mind that in measuring
environments where the me-
dium can reach the sensor
flange, buildup can form on the
antenna, possibly causing
measurement errors.
Note: Series 40 sensors are
suitable for measurement of
solids only under certain con-
ditions.