17
TDS Constant
TDS is determined by multiplying conductivity (mS) by a TDS
factor. The default factor value is 0.65. To change the TDS
factor, use the
“up”
and
“down”
keys to adjust the value
between 0.30 and 1.00. Press “
Enter
” key to save the new
value and go to the next calibration parameter.
Temperature Coefficient
The unit uses the temperature coefficient to calculate
temperature compensated conductivity. The default value is
1.91%. To change the Temperature Coefficient, use the
“up”
and
“down”
keys to adjust the value between 0 and 4.00%.
Press “
Enter
” key to save the new value and go to the next
calibration parameter.
Temperature Reference
The unit uses the temperature reference value to calculate
temperature compensated conductivity. The default value is
25
℃
. To change the Temperature Reference, use the
“up”
and
“down”
keys to adjust the value between 15 and 25
℃
.
Press “
Enter
” key to save the new value and go to the next
calibration parameter.
Probe Basic Cell Constant
The main display shows the deviation of the conductivity probe
(calibrated previously or default, the deviation range is
70%~130%, 100% without error). The secondary display
shows the current selected cell constant. Using the
“up”
and
“down”
keys to adjust the probe basic cell constant to that you
use from the 4 available cell constants (0.01, 0.1,1.0 and 10.0).
Press “
Enter
” key to save the new value and go to the next
calibration parameter.
Cell Constant Calibration
(a)
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 of the standard solution.
During cell constant calibration, the following parameters
