BERTHOLD TECHNOLOGIES LB 567, Руководство пользователя

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Chapter 4. Getting Started
MicroPolar 2 (++) LB 567 51
4.3.4 Installing the Spiral Antennas
The antenna pair and the height sensor (if required) are mounted
on a stable frame. The transmitting antenna has to be installed
below the receiving antenna above the belt. The height sensor is
installed before the moisture measurement, viewed in the con-
veying direction. See Figure 4-15:
Figure 4-15:
Measurement setup
on a conveyor belt
with spiral
antennas.
(with sample
values)
1.5 m
2.5 m
Spiral antenna
Reference cable 4 m
Evaluation unit
M
-T
x
M
-R
x
Conveying direction
Belt with product
Height sensor
M i cr o- P ol ar
Setup of the Spiral Antennas
Install both antennas in diametrically opposite locations
Typical antenna distances are approx. 10 to 70 cm.
The connection may face any direction.
The spiral antennas must be installed at a 90° angle to the
material.
The spiral antennas should be installed at least 10 cm above
the max. loading level.
Select the installation site of the spiral antennas such that
they will not be affected by dirt.
The length of the reference path normally corresponds to the
sum of the length of both antenna cables and has to follow
the same way as long as possible.
Note: Oblique transmission and irradiation of steel-reinforced
belts is not possible due to the circular polarization.