Sequoia LISST-SL, Руководство по эксплуатации

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LISST-SL V2.1
User’s Guide
22
V. Field Deployment
1. Preparing for a
Field
Experiment
20-26
If you have gone through a Laboratory instrument system
health check, you are mostly prepared for a field test.
(Field assembly can be minimized by leaving all exterior
plumbing attached, filled with water and tested before
taking the instrument to the testing site.) The only
difference is that you will collect an
in-situ background
file. This is to make fine corrections related to
temperature and to remove atmospheric pressure
changes from depth data. The in-situ background file is
collected with clean water recirculating through the
instrument with an in-line 0.2 micron filter (provided).
Because temperature differences between the
–SL and
river water can cause scintillation of laser beam in water,
and ‘invent’ large particles, the in-situ background is
collected after bringing the _SL to river water
temperature. A 15-minute submergence is recommended
for the
–SL to reach river temperature.
You must pack the following items:
LISST-SL
Topside Controller Box
B-reel
A platform for the B-reel.
Gallon of filtered clear water
A 0.2 micron filter cartridge, provided by
Sequoia.
Tubing and fittings to connect to
–SL for an
in-
situ background file collection.
Cable to connect TCB to B-reel.
Termination on the B-reel to connect to the
–
SL [ this is provided by Sequoia if you
purchased the B-reel through us.]
Carry the rest of the accessories supplied to
you as these may come in handy as well.
2. Getting set up
on the bridge
31,32
Check for air in pitot-tube . The best indicator is that the
velocity numbers show erratic values if there is air. See
also Appendix B. If air is present, follow procedure in
Appendix B.
Prepare for an
in-situ background file collection:
Make sure you have cleaned the water
passage. It is a good idea to use the Cleaning
Rod (see photos in Appendix E) to clean
windows a few times. After each cleaning,
check the background each time. When
backgrounds look similar, proceed next.
Connect tubing and 0.2 micron filter to the
LISST-SL as before. Fill the recirculating path
(tubing and filter) with filtered clean water.
Mount the B-reel on its platform.