13
OPERATION - 4
Martek Instruments, Inc.
4.1
H
OW
T
O
U
SE
T
HE
K
EYS
Operation of some of the keys described be-
low will require that the Mark 22 be calibrated.
If the Mark 22 has not been calibrated, proceed to
the chapter on calibration
after
reading this sec-
tion.
In addition to the POWER and LAMP
switches, there are two rows of buttons or
keys outlined in various colors. The KEY
LEGENDS indicate the operational mode or
function associated with the each key. The
bottom row of keys are
Mode Keys
that al-
low the user to select which operational
mode you wish to place the Mark 22 in. The
top row of keys are
Function Keys
that al-
low the user to select a particular value or
function associated with the current mode of
operation.
R E A D
R A N G E A U T O
4.1.1 Normal Operating Mode
In the Normal Display Mode the top row
of keys function as indicated by the white
key lettering above the top row of FUNC-
TION keys. The
READ
Key
will hold the dis-
play in MANUAL MODE. The
UP ARROW
AND DOWN ARROW Keys
will change the
display range of the conductivity measure-
ment, and the
AUTO key
restarts the auto-
matic scan function in the display.
Depressing of the
READ
will result in the
continuous display of the data present in the
display window at the time the key is de-
pressed. This feature allows the user to se-
lect a particular sensor measurement for be
continuous display and monitoring by the
Mark 22. The letter "M" will appear in the
lower right-hand corner of the display to in-
dicate that the Mark 22 is in the manual mode
for data presentation. If the
READ
key is
pressed again, the display will advance to
the next set of data. An example of the
READ
key being depressed three times is
shown in following sequence of display
screens:
READ Key - 1st Depression
READ Key - 2nd Depression
READ Key - 3rd Depression
The first line of the screen indicates the
date and military time. The second line con-
tains the measured battery voltage. Unplug
the battery charger to read the voltage stored
by the battery. The potential should remain
SELECT
K 0.01
FREE
K 0.1
PAUSE
K 1
RESUME
EXIT
K 10
CLEAR
SETUP
CELL
LOG
D 01/03 T 09:56
BATTERY 6.54 V M
13.043
µ
S C Cond
14.520
µ
S 28.15° M
08.64 ScpH
pH 08.64 27.56°
