When planning the installation of a USH-9 the extension of the cone-shaped measurement beam has
to be taken into account. The higher the sensor is mounted the bigger the diameter of the meas-
urement spot. Consequently, the mast and cross-beam must be designed in such a way that they do
not interfere with the ultrasonic beam and thus create unwanted reflections. The same applies to
river banks and channel walls in water level applications. Consult the table in
for recom-
mended distances between mast and measurement spot.
H [m]
Ø [m]
DB [m]
2
0.4
1.0
3
0.6
1.2
4
0.8
1.4
5
1.1
1.6
6
1.3
1.8
7
1.5
2.0
8
1.7
2.2
Figure 4
Measurement spot and USH-9 position
It is recommended to mount the USH-9 one meter above the maximum expected level and minimum
3 m above ground. The maximum mounting height is 10.5 m above ground. As an accessory, Sommer
provides a 1.6 m long, rotatable cross-arm for easy sensor mounting.
If a snow-depth monitoring site needs to be secured by a fence, the distance between the fence and
the USH-9 should be large enough to avoid snow build-up or snow drift.
7.2.1 Power supply
The USH-9 is designed for extreme environmental conditions at remote sites and with no grid con-
nection. The sensor switches automatically into standby-mode between measurements and thus con-
sumes only approx. 0.2 Ah per day which can be supplied by a 12V-solar-generator mounted to the
mast.
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Manual
