Sequoia LISST-200X User Manual

LISST-200X User’s Manual LISST-200X Operation Details Page 35
3. Saving and Evaluating Clean Water Backgrounds
In order to properly compute the size distribution, it is necessary to remove the light
scattering from the internal optics and window surfaces so that only the light scattering from
the particles of interest are used to compute the size distribution.
STEP
ACTION
RESULT
1
• Connect the instrument to the computer and establish
communication in the LISST-SOP200X program. (see
Step-by-Step Procedure: Establishing Communication
with the LISST-200X)
LISST-SOP open and
communicating with
LISST-200X.
2
• Clean instrument and install Clean Water Background
Test chamber.
• Fill with clean filtered water and make sure no bubbles
are in the water or on the windows.
• The water and instrument should be at the same
temperature. Using water a significantly different
temperature from the water can impact the quality of
the background.
• Stir the water well before obtaining a background to
make sure the water is well mixed.
• For the best Background, make sure the instrument is
clean; the water you use is filtered, and free of
bubbles. Temperature fluctuations in water will
seriously degrade the background. Use water at the
same temperature as the instrument. Stir well.
Optics submerged in
water
3
• Select Collect Background Scatter Data from the
LISST menu or press the button on the toolbar.
The factory background file will be automatically
acquired from the instrument and displayed on the
screen.
• If using the path length reduction module (PRM), you
must collect a background with the PRM installed. If
the PRM is installed, select the PRM checkbox in the
collect background window.
• When the BEGIN Collect button is pressed 20
samples will be displayed to the screen as they are
acquired.
Background collected
and displayed on the
screen

Sequoia LISST-200X Specifications

General

Brand	Sequoia
Model	LISST-200X
Category	Measuring Instruments
Language	English