3
OVERVIEW - 2
Martek Instruments, Inc.
tion legends and the associated mode
have the same color legend and border.
In the
Normal Display Monitoring
Mode
the top row of keys with the
WHITE borders are function keys. The
functions provided by these keys are
identified by the WHITE key legends lo-
cated just above the top row of function
keys. The
READ
key will hold the dis-
play in Manual Mode. The
RANGE
keys
will change the range for the conductiv-
ity display, and the AUTO key will restart
the automatic display monitoring mode.
In the
Setup Mode
the top row of keys
are used as function keys. The functions
provided by these keys are as indicated
by the YELLOW key legends located on
each of the function keys. The
SELECT
key is used to select options from the dis-
played menu. The
UP ARROW
key
moves
the
blinking
display
down
through the menus and increments the
numeric digits when adjustment of the
displayed numeric value is required. The
DOWN ARROW
key moves the blink-
ing display up through the menus and
decrements the numeric digits when ad-
justment of the displayed numeric value
is required. The
EXIT
key allows the user
to move backwards through the dis-
played menus.
In the
Cell Mode
, the top row of keys
function as indicated by the BLUE key
legend located on each of the top row of
function keys. The
K 0.01
,
K 0.1
,
K 1
and
the
K 10
keys are used to select the cell
constant stored for Cell #1, Cell #2, Cell
#3 and Cell #4 respectively.
In the
Log Mode
, the top row of keys
function as indicated by the RED key leg-
end located on each of the top row of keys.
To log data, depress the
LOG
key once.
The Mark 22 will display a file number.
Depress the
LOG
key again, and observe
that a black square will appear in the up-
per right corner of the display. This indi-
cates that the Mark 22 is now in the Log
Mode of operation. Depress the
LOG
key
again, and observe that the black square
is no longer present in the display. This
indicates that the Mark 22 Log Mode has
been exited. The
FREE
will display the
amount of storage memory remaining in
terms of storage time( hours ). When in
the Log Mode, pressing the
PAUSE
key
will cause a letter "P" to appear in the right
corner of the display. The Mark 22 will
stop logging but remain in the Log Mode.
This procedure is used to conserve
memory. Depress the
RESUME
function
key to resume logging data. Finally, The
CLEAR
function key will clear all of the
logged data from memory.
7. Depression of the yellow
SETUP
key en-
ables the setup mode of operation and
subsequently allows the operator access
to the unit's setup functions. The Setup
functions provided by the Mark 22 are as
f o l lo ws :
CAL
(Calibration) option is used for es-
tablishment of the zero and span calibra-
tion points associated with temperature,
conductivity and pH measurements as
well as manual entry of the date and time
of day parameters.
COMP
(Compensation) option provides
the selection of three temperature cor-
rected conductivity equations: GE, Marsh
& Stokes, and Truman Light in addition
to the slope coefficients for conductivity
and pH. This function also allows cali-
bration of 0 - 1 Volt external recorder out-
p u t .
CELL
option allows the operator to
manually input a specific cell constant for
each of the four nominal cell constants.
For ultrapure water, the nominal cell con-
stant is 0.01.
The
LOG
option allows the operator to
manually enter the start time to begin log-
ging data, the logging interval (the time
in minutes between scans), and the num-
