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3.2.2.6 Align the sensor horizontally
The sensor must be aligned horizontally to make sure that the sensor is centered over the flow. If the pipe is not
levelled and has a slope of 2 degrees or more, align the sensor to be parallel with the surface of the water.
Figure 12: Horizontal alignment of the RAVEN-EYE
®
sensor
Procedure
1. Use a bubble level and position it on the horizontal platform of the RAVEN-EYE
®
(see point 1 on Figure
12).
2. Slightly loosen the wing nut and position the sensor so that the platform is positioned horizontally.
3. Tighten the wing nut and make sure the sensor is at the correct position.
3.2.2.7 Make a final alignment check
The correct vertical and horizontal alignment of the sensor is necessary for accurate measurements.
1. Check the vertical alignment (section 3.2.2.3 or section 3.2.2.5) and make adjustments if necessary.
2. Check the horizontal alignment (section 3.2.2.6) and make adjustments if necessary.
3. Repeat steps 1 and 2 until no further adjustments are necessary.
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