YSI Vertical Profiler Systems - Manual (Page 26)

YSI Profiler System USER Manual
You should at this time also print the ‘*.rpt’ and ‘*.pfw’ files for your hard copy records. See
Appendix B for examples.
2.3 How the CR10X Executes the Profile Routine
Using Profile Wizard you have now created a profile routine file. In Section 3 you will learn to
send this file to the CR10X data logger using LoggerNet™ software. Once in the CR10X this
program controls the movement of the winch, sonde data collection, and other actions. Prior to
moving to Pre-Deployment checks, and in order to better understand how the ‘controller’
software executes the profile routine, consider the description and example below.
Since a depth sounder was not used in the example above, it will be considered part of the
routine below. In coastal applications, the tide can raise or lower the water level two or more
meters at times. The importance of knowing the total depth of the water column at all times is
essential. In tidal applications the use of a depth sounder is necessary if you intend to monitor
close to the bottom or to the surface.
EXAMPLE & DESCRIPTION OF PROFILE ROUTINE WITH DEPTH SOUNDER
For better understanding of the steps in a profiling routine, consider a new example where the
mean water depth is ten (10) meters and the daily tide is about two (2) meters. Assume the
system has a depth sounder and the Profile Wizard setup has been programmed accordingly.
The use of a depth sounder enables the system to track the overall water depth before the start of
a profile and again during the last 20% of the water column that is being profiled.
Profile Parameters
Profiles per day
4
Step Size 1 m
PARK (relative to surface) 5 m
START (relative to surface) 1 m
END (relative to bottom) 1 m
Top to Bottom Profile
In terms of ‘profile logic’, the CR10X goes through the following steps to ensure that depth and
parameters are measured as intended by the profile program. This is done through RS-232
communications using a serial I/O interface that connects to the CR10X to various sensors and
accessories.
Every six (6) hours starting at 00:00:00 (midnight) the program requests a PARAMeter check
from the sonde. This information is collected to insure that the sonde is operational and the
sonde parameters are unchanged. Once this information is received from the sonde and verified
as correct, the program requests a sonde water depth. The sonde should be in Park position five
(5) meters (+/- 0.2 m) below the surface. The information is collected, and then the overall
depth is measured by the depth sounder. The overall water depth is collected and recorded as a
reference to insure that the sonde will never hit the bottom during the profile.
The program next decides if the PARK to START move distance is greater than two (2) meters.
It turns the motor on to move up or down while monitoring the sonde depth to see how close it is
to the one meter depth (START). In this example the sonde was parked at 5 meters and was
moving up 4 meters to the start position. As a result the “move to” distance is 4 meters. If the
“move to” distance is less than two (2) meters, it calculates the time the motor needs to be
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669523 Rev B Page 2-17