July 2019 – TD 304 OPERATING MANUAL – Doppler Current Profiler Sensor
Page 73
If the DCPS is running in a slow recording group in the multi-group recorder (more information about the Multi-group
recorder is available in the TD 303 Chapter 3.3.1), it is possible to have the other sensors in a faster group to give more
frequent update of input parameters.
3.5.8
Input Parameter Conductivity
Figure 3-23: External conductivity sensor parameter input
gives an example of a conductivity sensor connected to the same Datalogger as the DCPS. The
Conductivity sensor is selected as
Conductivity Sensor Id
and the Conductivity(mS/cm) is selected as
Conductivity
Parameter Id..
When the DCPS receives input from these three sensors via the Datalogger, it is able to calculate the correct salinity,
depth and sound speed. These values are used for correct positioning of cells and the correct conversion from Doppler
shift to current speeds.
3.5.9
Input Parameter Heading
Figure 3-24: External compass sensor input
The sensor can also take an input from an external Compass, like for example the Airmar H2183 Compass. Surface
buoys are often made of steel. The magnetic influence from the buoy can give a big error on the compass heading
measured by the DCPS. A compass mounted on a mast away from the buoy structure is often a better method which
gives a more accurate compass measurement. Select a compass connected to the Logger in the
Heading Sensor Id
drop-down menu if available and the heading parameter in
Heading Parameter Id
. The
Heading Alignment Offset
(Deg.M)
value can be set to compensate for the misalignment between the compass axes and the axes on the DCPS.
When finished with the configuration, click
Next
twice and wait for the Datalogger to finish the saving of the new
configuration
.