YSI ADV6600 - Manual (Page 77)

ADV6600
Y S I
Environmental
Page 67
Section 5. Field Mounting and Installation
Before deploying your ADV6600 in actual field applications, you should be aware of considerations
which are likely to affect your site selection. In the sections below, several methods of field
mounting your ADV6600 are described, along with some cautions which may eliminate certain
sites. Be sure to read this section carefully before deciding where and how to deploy your
ADV6600.
NOTE CAREFULLY: Regardless of the mounting method, the ADV6600 must be mounted in
a vertical orientation with its sensors facing DOWN. Mounting with the sensors up or in a
horizontal orientation will result in erroneous direction and velocity data.
5-1. Mounting Methods
The ADV6600 can be mounted in several ways depending on the field application. These range
from temporary mounts for short-term data collection projects (a few minutes to a few hours) to
permanent installations for long-term monitoring stations. In general, an ADV6600 can collect
valid velocity data when deployed using the following methods.
• Mounted directly to a vertical pole, bridge abutment, or similar structure. Ideally, the sonde
should be separated from the mounting pole by approximately 5 times the diameter of the pole
in order to avoid any flow interference from the structure.
• Mounted vertically in a hollow PVC pipe that is attached to a pole, bridge abutment, or similar
structure so long as the Doppler sensor extends completely below the pipe bottom
• Deployed vertically using a rope or chain as a tether
• Suspended beneath a tethered floating buoy
There are, however, several factors of which you need to be aware that will affect the quality and
accuracy of the ADV data.
• High frequency rotations of the system can create temporary inaccuracies in the compass
readings (described in the following section) that will compromise the accuracy of velocity
measurements.
• There must be sufficient scatterers in the water so that accurate velocity measurements can be
made. A Beam Check should be performed (if possible) 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). Any magnetic interference (ferrous material) 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 should be performed before each deployment, as it can