How To Use The Keys; Normal Operating Mode - Martek MARK 22 Operation Manual

4.1 H T U
OW O SE
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
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
op eratio n.
R E A D R A N G E
SELECT
K 0.01
K 0.1
FREE
PAUSE
SETUP CELL

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.
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.
Martek Instruments, Inc.
T K
HE EYS
which operational
A U T O
EXIT
K 1 K 10
RESUME CLEAR
LOG PRINT
The UP ARROW
OPERATION - 4
Depressing of the READ will result in the
continuous display of the data present in the
display window at the time the key is
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.
pressed again, the display will advance to
the next set of data.
READ key being depressed three times is
shown in following sequence of display
screens:
READ Key - 1st Depression
D 01/03 T 09:56
BATTERY 6.54 V M
READ Key - 2nd Depression
13.043µS C Cond
14.520µS 28.15° M
READ Key - 3rd Depression
08.64 ScpH
pH 08.64 27.56°
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
de-
If the READ key is
An example of the
13