LaMotte 2020t BLE Mode D'emploi page 45

that the sample compartment lid is always fully closed when taking readings. The backlight
will interfere with turbidity readings. The meter will temporarily disable the backlight while
turbidity measurements are being taken.
GENERAL OPERATING INFORMATION
„ OVERVIEW
The 2020t/i BLE is a portable, microprocessor controlled, direct reading nephelometer.
Turbidity is measured directly according to EPA Method 180.1 or ISO Method 7027, or
is calculated ratiometrically by using a combination of the two measurements. It has a
graphical liquid crystal display and six button keypad. These allow the user to select options
from the menu driven software, to directly read test results or to review stored results of
previous tests in the data logger. The menus can be displayed in eight languages.
The 2020t/i BLE uses a state of the art, multi-detector optical configuration that assures
long term stability of calibrations, high precision and accuracy and low detection limits. All
readings are determined by digital signal processing algorithms, minimizing fluctuations
in readings and enabling rapid, repeatable measurements. The microprocessor and optics
enable a dynamic range and auto-ranging over several ranges. Energy efficient LED light
sources are used for ISO turbidity. EPA turbidity uses a tungsten filament light source that
meets or exceeds EPA specifications and is designed for a uniform light spot image and
stable output.
A USB wall adapter, USB computer connection or lithium battery powers the 2020t/i BLE.
GENERAL OPERATING INFORMATION
The operation of the 2020t/i BLE is controlled by the menu driven software and user
interface. A menu is a list of choices. This allows a selection of various tasks for the 2020t/i
BLE to perform, such as, scan blank and scan sample. The keypad is used to make menu
selections that are viewed on the display.
„ THE KEYPAD
This button will scroll up through a list of
menu selections.
The button is used to select choices in a
ENTER
menu viewed in the display.
This button controls the backlight on the
display.
This button will scroll down through a list
of menu selections.
This button exits to the previous menu.
EXIT
This button turns the meter on or off.
„ THE DISPLAY & MENUS
The display allows menu selections to be viewed and selected. These selections instruct
the 2020t/i BLE to perform specific tasks. The menus are viewed in the display using two
general formats that are followed from one menu to the next. Each menu is a list of choices
or selections.
The display has a header line at the top and a footer line at the bottom. The header displays
the title of the current menu. The footer line displays the time, the data logger status and
the battery status. The menu selection window is in the middle of the display between the
header and the footer.
The menu selection window displays information in two general formats. In the first format
only menu selections are displayed. Up to 4 lines of menu selections may be displayed. If
more selections are available they can be viewed by pressing the arrow buttons
to scroll the other menu selections into the menu selection window. Think of the
menu selections as a vertical list in the display that moves up or down each time an arrow
button
top and bottom menu choices are connected in a loop. Scrolling down past the bottom of
the menu will lead to the top of the menu. Scrolling up past the top of the menu will lead to
the bottom of the menu.
is pressed. Some menus in the 2020t/i BLE are looping menus. The
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ENTER
EXIT