Hach US9001, User Manual

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Table 2 Site installation guidelines
Guideline Details
Do not hang the sensor by the sensor cable. The sensor cable may stretch and cause measurement
errors.
Prevent the sun from shining directly on the sensor. Intense, direct sunlight on the sensor will increase the
temperature of the sensor housing higher than the ambient
air temperature. This can cause inaccurate measurements.
For the US9001 (downlooking) sensor, make sure
that the lowest mounting nut is more than 6.4 mm
(0.25 in.) from the sensor face. Refer to
Figure 3 .
If the mounting nut is near the sensor face, level spikes
can occur at extreme temperatures.
Hand tighten the hex nut, then tighten ½ turn. Do not
overtighten the hex nut or the isolation gasket will not
decrease vibrations.
Prevent strong winds and air currents from blowing
directly under the sensor. The strength of the ultrasonic signal is decreased by the
wind.
Install the sensor so that the ultrasonic signal does
not hit the sides of a small pipe or narrow
flumes/channels. The ultrasonic signal emits a half beam angle of 6 °. Refer
to
Figure 4 and Figure 5 . Set the minimum and maximum
distance for the measurement target to prevent false
echoes and incorrect level measurements. Refer to the
FSDATA Desktop documentation to change the application
settings.
Install the sensor sufficiently high above the surface
of the water so that it does not go under the water
when the level increases. The speed of sound in water is much faster than in air. A
sensor that is under the water will give unusual values.
Figure 3 US9001 (downlooking) sensor
1 Hex nut 2 Gasket, vibration isolation
English 7