How To Select The Conductivity "K" Factor - Martek MARK 22 Operation Manual

4.2.2 How to Select the
Conductivity "K" Factor`
The Mark 22 allows you to adjust the
value of the cell constant or K factor of four
cell constants: K .01, K 0.1, K 1, and K 10. In
this way, fine adjustments can quickly be
made to the Mark 22 to match the cell con-
stants of different conductivity sensors.
The K factors have been preset at the fac-
tory for the values listed above and for any
Martek Conductivity Reference Cell ordered
with the Mark 22.
Bbefore changing the cell constant for a
particular conductivity sensor, you must
make certain that the cell constant you are
trying to input falls within the overall "K"
factor range . The figure below presents the
range of "K" factors that can be used with
the four basic cell constants.
Basic "K" Conductivity Reference Cell
Factors
K = 0.01
K = 0.10
K = 1.00
K = 10.0
However, each cell constant can be
changed to any value desired. To do this, sim-
ply press the SETUP key and select the op-
tion labeled CELL. The display will look like
this:
CELL #1
CELL #3
If you press the SELECT key again, the
display will show the cell number and the
value of the cell constant which will be flash-
i n g .
Martek Instruments, Inc.
"K" Factor Range
"K" range: .005 - 0.05
"K" range: 0.05 - 0.50
"K" range: 0.50 - 5.00
"K" range: 5.00 - 50.0
CELL #2
CELL #4
OPERATION - 4
CELL #3 IS
SET TO K 1
with the "K 1" prompt flashing.
the UP and DOWN ARROW keys, change
the flashing "K" factor until it reads "K .01".
Now press the SELECT key. The display will
now indicate:
CELL #3 IS
= TO K .01000
and the "1" will be flashing. You can now
alter the value of the flashing digit by press-
ing the UP or DOWN ARROW key. You can
then move forward to the next digit by press-
ing the SELECT key and move back to a pre-
vious digit by pressing the EXIT key.
Another press of the SELECT key and the
cell constant value can be adjusted by mov-
ing the digits up or down with the arrow keys
then pressing the SELECT key to enter the
value into the Mark 22's memory. Once the
K factors have been set to the proper values,
press the EXIT key to return to the set up
menu. Figure 4.2 depicts a cell constant range
chart to give you the low, medium, and high
ranges for the four most commonly used K
factors:
LOW
K=0.01 1.0000 uS
K=0.10 10.000 uS
K=1.00 100.00 uS
K=10.0 1.0000 mS
Figure 4.2 - Cell Constant Range Chart
Once the correct cell constant has been
selected for the conductivity sensor to be
used, you are ready to start monitoring.
Using
MEDIUM HIGH
10.000 uS 100.00 uS
100.00 uS 1000.0 uS
1.0000 mS 10.000 mS
10.000 mS 100.00 mS
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