YSI ADV6600 - Manual (Page 176)

Appendix D. Frequently Asked Questions
ADV6600
Y S I Environmental
Page 166
D-3. Installing the System
How should I deploy my ADV6600 for long term monitoring studies of water current and
quality?
An ADV6600 can collect valid velocity data when deployed using the following methods.
• Mounted directly to a vertical pole
• Mounted vertically in a PVC pipe that is attached to a pole, bridge abutment, or similar
structure
• Deployed vertically using a rope or chain as a tether
There are, however, significant factors of which you need to be aware that will affect the quality and
accuracy of the ADV data.
• Significant rotations of the system can create with the compass (described in the following
section) that can temporarily compromise velocity measurements.
• There must be sufficient scatterers in the water so that accurate velocity measurements can be
made (described in the preceding section). A Beam Check should be performed at all sites
before a deployment, and is a must at sites where the water is very clear.
• There must be minimal magnetic interference to avoid influencing compass readings (see
compass section). If possible, all mounting fixtures should be made of stainless steel,
aluminum, or plastic. If the mounting fixture must contain magnetic (ferrous) material, it needs
to be stationary in relation to the ADV6600, i.e., the interfering material and the ADV6600
should be attached to one another. A compass calibration and verification should be performed
before each deployment at the site with the sonde in the mounting apparatus.
• The ADV sensor needs to be submerged to make accurate velocity measurements.
• Flow interference (caused by the mount, pilings, rocks, weeds, etc.) will affect velocity
measurements. For this reason, deployment location must be considered carefully to be sure that
the sampling area of the ADV is free from these disturbances for the entire deployment.
• The system can be deployed on the inside of a pipe but the Doppler sensor must be located
below the bottom of the pipe at least as far as it extends below the probe guard (see picture in
Section 5-1.2 above) for proper performance.
• It is important to select a deployment site that is representative of the flow that you are trying to
measure. Environmental stability (i.e., not subject to massive changes in conditions) is
preferable but not required.
• If data will be collected in the internal memory of the ADV6600 during an autonomous
deployment, the recorder must be enabled.