Electro-Chemical Devices (ECD) H10C - Manual (Page 7)

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3. Standard solution of 111.9mS at 25°C: Accurately weight
out 74.264 grams of research grade dried Potassium
Chloride (KCL). Dissolve in 1000ml of distilled water.
[Note: You can store the remaining solution in a plastic container for
one week but the air space between the cap and the solution must
be kept to an absolute minimum. Storing the excess solution below
4°C can increase the storage life. If you have any doubt of the
accuracy of the stored solution, a fresh batch should be prepared.]
B. Calibration
Calibration setup contains five sections: TDS, Cell, Temperature
Coefficient, Temperature reference and Conductivity Calibration. To
access these sections:
1. Connect the conductivity probe, PN 2008210, to the unit
and turn the unit on. The screen will display CELL and the
cell constant of the conductivity probe.
2. Allow temperature reading to stabilize, press “Cal” key to
enter the calibration mode. CAL appears on the LCD. Press
“Mode” key to sequentially display the following sections:
[Note: Press “Enter” key to accept any values changes in each
section and automatically advance to the next section. If there are
no changes, the unit accepts the current value and proceeds to the
next section.]
TDS
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, or press “Mode” key to cancel
the change and display the CELL screen.
CELL
The second screen will display CELL and the current cell value. The
default cell value is 0.50 and is displayed in the lower right of the
screen. The unit allows a variance of +/-0.15 before displaying an
error message. The cell value can’t be adjusted at this screen;
calibrating conductivity is the only way to adjust the cell constant.
Press “Enter” key to reset the cell constant to 0.50 and display the
Temperature Coefficient screen.
[Note: Be certain to press “Enter” key to reset the cell constant to
0.50. If “Mode” key is pressed, the unit retains the previous cell
constant and calibrates from a value that is already offset.]