Instruction manual Wav WaveGuide Server
25ms. This measurement consist of one up sweep (red curve) and one down sweep (blue curve).
Depending on the sea state a region is selected where the reflection of the water surface can be expected
(within the green lines). The highest peak in this region represents the water surface. The signal strength
can fluctuate between 60 and 20 dB. Due to the Doppler shift the red and the blue curve can shift away
from each other. Often a second peak is visible in the reflection diagram like in figure 14. This is from the
multiple reflection between radar and water surface. This second peak must be outside the green
acceptance window. If there is no peak above the 20dB threshold the measurement is disapproved.
Set sample rate and mounting height and pipe diameter
This can be done in the Configure radar window. The radar configuration is protected by an authorization dialog.
Sample rates of 5, 2.56, 2 and 1.28 Hz can be selected. The mounting height is given in cm. At delivery the
mounting height is set to zero. The reference point of the radar is the underside of the sensor unit. If mounting
height is set to zero the water level is referred to the under side of the sensor unit. So if the result is -500 cm you
know that the distance between the bottom of the sensor and the water surface is 500cm.
If the mounting height is set to 460cm the result will become -40cm.
In case of spurious reflections from obstacles below the radar (to be inspected visa the reflection diagram) it is
possible to tilt the radar slightly (up to 15 degrees) to get away from these reflecting obstacles.
Version 4.1
13 of 30
Oct 2013
Fig. 14: The reflection diagram window.
Fig. 15: The configuration window of the sensor.
