Hach DR/2010 - Page 37

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Table 4 Operating Controls, Indicators and Connections
Item
No.
Name Description
1 Cell Compartment Cover Light shield for sample cell compartment. Contains list of
stored program numbers on underside.
2 Wavelength Control Used to select appropriate wavelength in nanometers for
test parameters.
3 Display LCD window divided into three function areas: wavelength,
numeric output and alphanumeric message. Indicates
wavelength, prompts and gives measurement results in
operational modes. Displays menu options when scrolling
through menu with arrow keys. Provides error messages
when invalid entries are made.
4
READ key Used to start measurement readings of standards and
samples in Momentary mode.
Not necessary in Constant-On mode.
5
ZERO key Used to zero the instrument with the blank solution in the
cell holder before measuring the sample.
6
EXIT key Each press moves the display up/back one level in the
menu without altering memory or settings. Acts as an
escape key. Exits current menu or edited item without
retaining changes made during the edit.
7 UP/LEFT ARROW key Scrolls through selected menus or programs. Moves cursor
to the left (left arrow accessed with SHIFT key).
8
ENTER key Usedtoconfirmapromptoranswer“yes”toadisplayed
question. Accepts the displayed value. The display then
returnstothenextlevelupinthemenu.Alsousedtoentera
submenu.
9 DOWN/RIGHT ARROW key Scrolls through selected menus or programs. Moves cursor
to the right (right arrow accessed with SHIFT key).
10
CONC/9 key Initiates concentration readout mode when used
with
SHIFT key.
Has numeric key function when not used with
SHIFT key.
11 BATT/6 key Used to check condition of battery when used with SHIFT
key. Current battery voltage and battery-life bar graph will
be displayed.
Has numeric key function when SHIFT key is not used.
12
USER PRGM/3 key Used to enter a user-program menu when used with SHIFT
key.
Has numeric function when
SHIFT keyisnotused.
13
TIMER/5 key Starts timer when used with the SHIFT key. Has numeric key
function when
SHIFT key is not used.