18
are over-ridden: temperature reference (fixed to 25.0
℃
) and
temperature coefficient (fixed to 1.91%).
[Note:
If you want input
K value
directly, please press the
“
Enter
” key to go to the
K Value Input.]
(b)
Wait for the values of temperature and conductivity to
stabilize for a few seconds. Using 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
℃
.
(c)
Press “
Enter
” key to calculate and save the new value of
Cell Constant
or press the “
Enter
” key 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.
C. Conductivity Measurements
1.
Turn the unit on. Place the probe in the solution to be
measured. Immerse the probe (at least 2” to 3” or 5~7cm from
the tip). Shake the probe lightly to remove any trapped air
bubbles in the conductivity cell.
2. Press
“Mode”
key to enter the desired measurement mode
(Conductivity or TDS). The message “over” or “undr” may
appear briefly on the display indicate auto-ranging; this is
