7
Probe Basic Cell Constant
The main display shows the Cell Constant of the conductivity
probe (calibrated previously or default, the deviation range is
70% ~ 130%). The secondary display shows the current
selected cell constant which is either 0.01, 0.10, 1.00 or 10.0.
Press the
“Up
”
and
“Down”
keys to select the one you want
to use. Press
“Enter”
key to save the new value and go to the
next calibration parameter.
Standard Solutions Calibration
Immerse the probe in a standard of known conductivity
solution (See section
Preparing Standard Solutions
),
preferably a standard in the middle range of the solutions to
be measured. Immerse the probe (at least 2” to 3” or 5 ~ 7cm
from the tip) without touching the sides of the calibration
container. Shake the probe lightly to remove any air bubbles
trapped in the conductivity cell. The unit will display the
conductivity value. Wait for the values of temperature and
conductivity to stabilize for a few seconds. Press the
“
Up
”
and
“
Down
”
keys to adjust the reading of the display until it
matches the value of the known standard conductivity solution
at 25
℃
. Press the
“
Enter
”
key to save and go to the next
calibration parameter.
K Value Input
(a) The unit will display the conductivity value of the standard
solution with the
CELL K=
staying on.
[Note:
If the
Cell Constant
has been calibrated, please
press the
“Enter”
key to exit calibration and return to
normal operation.
]
(b) Press and hold the
“Up”
or
“Down”
key, the main display
will show the deviation of the conductivity probe. You can
now input the K value (from 70%~130% of the probe basic
cell constant). After releasing the
“Up”
or
“Down”
key,
the unit will display the conductivity value with the
CELL
K=
staying on.
(c) Adjust the K value until the conductivity value displayed on
the LCD matches the value of the known standard
conductivity solution at 25
℃
.
(d) Press
“Enter”
key to save the new
K value
of the cell to
exit calibration and return to normal operation mode.
