GLX-RSS-2-300 WL User Manual
9
GLX-RSS-2-300 WL Non-Contact Flow Meter
Lengths and diameters are calculated based on 3 dB signal drop (half signal power) due to the antenna
pattern. For practical application the impact is that most of the return energy is reflected from the inside
of the bounding shapes, ellipse for surface velocity sensor and circle for level sensor, but some energy
could also be received from objects outside from the bounding shapes. Objects outside of the bounding
shape should be fairly big to cause problems with the measurements and additionally, the sensors
have internally implemented special signal processing algorithms to filter such reflections. However, it
is recommended to keep the zone around the target shape of the radars as clear as possible to get best
measurement accuracy.
4.2. Measurement Quality Indicator
Geolux RSS-2-300 WL instrument is constantly calculating various parameters of the signal in
the signal processing algorithms and will continuously, along with measurement data, report the
measurement quality. The quality indicator value ranges from 0 (best quality) to 3 (worst quality)
and can be used to interpret the data in the analysis software with better understanding and
confidence.
For example, when the radar is mounted on the railway bridge, one of common applications, the
measurement quality will be very good most of the time, except when a train is passing due to
the extensive vibrations. In this case the radar will still report measurements but the reported
values could be quite wrong, and also the measurement quality indicator value will go up to a
higher value. It is up to every user to interpret the quality indicator value for their application, but
general recommendation is that measurements with quality indicator 3 cannot be trusted, value
2 could be questionable, and values 1 and 0 are very good and accurate.
Height [H] L [m]
D1 [m]
D2 [m]
R [m]
0.3 m
0.3
0.3
0.2
0.03
0.5 m
0.5
0.5
0.3
0.04
1 m
1.0
0.9
0.3
0.09
2 m
2.0
1.8
0.6
0.17
3 m
3.0
2.7
0.9
0.26
4 m
4.0
3.6
1.2
0.35
5 m
5.0
4.5
1.5
0.44
6 m
6.0
5.3
1.8
0.52
7 m
7.0
6.2
2.1
0.61
8 m
8.0
7.1
2.4
0.70
9 m
9.0
8.0
2.7
0.79
10 m
10.0
8.9
3.0
0.87
11 m
11.0
9.8
3.3
0.96
12 m
12.0
10.7
3.6
1.05
13 m
13.0
11.6
3.9
1.14
14 m
14.0
12.5
4.2
1.22
15 m
15.0
13.4
4.5
1.31
