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3. Operation
3.1 Keyboard and display
The Mark 25 front panel consists of a
4 digit red LED display, 3 parameter and
channel LED's, an alarm LED, and an 8-
key keypad. The display is used to
present all parameter measurements,
operator prompts and system errors.
o
C
PPM
PPB
DISSOLVED OXYGEN ANALYZER
READ
Range
o
C
PPM
LOW
MED
ZERO
SPAN
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The keys are arranged in two rows, four
keys in each row.
The top row of keys consist of three
color-outlined function keys and are
used to perform instrument operations
such as selecting which parameter to
view, what range the parameter is to be
viewed in, parameter calibration and
system set up.
The bottom row of keys are multi-
colored, multi-legend keys and are used
in conjunction with the function keys.
The same colored legends correspond
to the same colored function key.
The arrow keys are used to view
channels, select functions during setup
and calibration, and increment or
decrement a displayed value.
ALARM
CALIB
PPB
HIGH
RUN
READ key - When the <READ> key is
pressed, the Mark 25 will display rd. If
one of the bottom keys is selected, the
parameter high-lighted in red will be
displayed and its corresponding LED lit.
RANGE key - Range changes can be
made manually for dissolved oxygen. To
display and/or change the range, press
the <RANGE> key, then select one of
the following keys:
LOW = rG 1: 0-20 ppb
MED = rG 2: 0-200 ppb
HIGH = rG 3: 0-2 ppm
DOWN ARROW = rG 4: 0-20 ppm
UP ARROW = rG A: Auto-ranging
NOTE: Manually changing the range for
dissolved oxygen changes the analog
recorder output scaling. See Section 3.6
for details.
Viewing a different channel is easily
done by pressing the <UP> or <DOWN>
arrow key. The parameter LED's to the
left of the Mark 25 display also indicate
which channel is being viewed. Channel
ID's are as follows:
Red LED - Channel 1
Green LED - Channel 2
Red/Green LED - Channel 3
Flashing Red LED - Channel 4
7
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