JANUARY 2010 - TD 220a DEPLOYMENT GUIDE, RDCP600
Page
27
Reliable solutions
1.5.1
Column Limitations
Surface referred
columns are only available when a high accuracy quartz pressure sensor 3187 is
installed, and when the distance from the instrument up to the surface is below maximum range,
refer TD220b
RDCP Studio
and Technical specifications in TD220c
RDCP Primer
.
There may be only one surface cell, but several of the other column types.
Instrument referred columns and surface referred columns can both be set up in the same
deployment. This is an advantage when certain parts of the water column are monitored with
respect to the surface as e.g. in harbour and fish farming installations.
A surface referred column will automatically compensate for tidal variations.
Different cell sizes may be used in different columns in the same deployment, but keep in mind
that the pulse length will be the same for all columns.
NOTE!
Refer to page 29 for considerations and recommendations regarding cell size and pulse length.
Surface referred columns that extend below the instrument are skipped and padded with zeros in
the data.
The minimum distance to the first cell for an
instrument referred column is the instrument
blanking distance plus half the pulse length, ref.
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and
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(the blanking distance is 1m
for the 300m version, and 2m for the 2000-6000m
versions).
The minimum distance to the first cell for a surface
referred column is half the pulse length.
The current maximum number of cells set up in one
deployment is 150. The maximum number of cells in
a single column is 100.
.
Figure 1-13 Minimum Distance to First
Cell
Minimum start
Blank
Pulse
