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Aanderaa 4117 Operating Manual
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Page 26 Aanderaa Data Instruments AS – TD302CHAPTER 4 Installation and deployment considerationsPlease refer Table 4-1 for the most important installation and deployment considerations.Table 4-1 Installation considerations for the Pressure, Tide and Wave and Tide sensors.DescriptionMeasurement Parameters:Pressure/Temperature Tide WaveInstall the sensor with the top up x x xInstall the sensor in a fixed installation x xThe deployment depth must be at least 1 meter below thewater surface (at the lowest tide level) xWe recommend that the deployment depth is less than 15 m xInstall the sensor with top up because the pressure inlet is filled with silicone oil. The sensor is calibrated fortop-up installations; other positions will produce a small zero offset.Valid measurements of tide and wave parameters require a fixed installation on a vertically stable structure toavoid movements of the sensor due to water conditions or settling.For wave measurements the sensor should at all times be deployed at least 1 meter below the water surface toensure valid measurements. Low water levels require more internal calculations. If the water level becomes lessthan 0.25 meters, the water level will be set to 0.25 meters.The data quality of the wave measurements is reduced with increasing installation depth due to waveattenuation, refer Appendix 4. The pressure variations generated by waves are damped, and the cut offfrequency reduces the frequency range in the wave spectrum. At depths larger than 20 meters the dampening isdifficult to compensate for because of a weak signal. The frequency range is also very limited.If the Wave and Tide sensor or the Tide sensor is attached to a floating device the sensor cannot measure tide,but can compute draft of the structure.If the Wave and Tide sensor is attached to a very large floating device so that the sensor will be relatively steadyin relation to the mean sea level, then the sensor can measure waves with reduced quality. Such a large floatingdevice can be e.g. a floating fish farming facility or oil rig. We recommend installation on the sea floor orattached to a fixed pillar. Installation on a string is not recommended because there will always be somemovement of the string/sensor.IMPORTANT! Do not deploy the sensor deeper than the pressure rating of the pressure element. |
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