6
2. Allow temperature to stabilize. The message ‘rAng’ (range) may display briefly to indicate
unit auto-ranging; this is normal. After temperature stabilization, use the
and
keys to
adjust the conductivity value to that of the conductivity standard at 25
C. Press Enter
(
) to calibrate. The unit beeps twice to indicate a successful calibration, then
automatically switches to normal operation mode.
CONDUCTIVITY MEASUREMENTS
1. Turn the unit on. Place the probe in the solution to be measured. Completely submerge
the probe. Shake the probe lightly to remove any trapped air bubbles in the conductivity
cell.
2. Press
MODE to enter the desired measurement mode. The message ‘rAng’ (range) may
appear briefly on the display indicate auto-ranging; this is normal. Allow temperature to
stabilize before taking measurements.
SAVING, VIEWING AND DELETING DATA
The EC300A can save 50 data records. When in measurement mode, press
to save a
record. The instrument will confirm the saved data by displaying SAVE and the record
number for one second. “Full” is displayed when trying to save data and the memory is full.
To view saved data, press mode until RECALL is displayed and then press
. Use the Up or
Down arrow keys to review different saved records. Press Mode to escape back to
measurement mode.
To delete data records, press Mode while in measurement mode until DELETE is displayed.
Press
. “All” will be displayed and blinking. Press the Up or Down arrow key to switch
between delete ‘All’ or ‘Each’ options. Select either ‘All’ or ‘Each’ by pressing
while that
option is displayed.
If ‘All’ is selected, all records will be deleted from memory and ‘None’ will be displayed. Press
Mode twice to return to the measurement mode.
If ‘Each’ is selected, the Up and Down arrow keys will allow you to scroll through the saved
data records. Press
to delete the selected record. All records after the deleted record will
shift up to keep the records in sequential order. For example, if record 3 is deleted, record 4
will become record 3 and record 5 will become record 4. Press Mode twice to return to the
measurement mode.
PROBE MAINTENANCE
The most important requirement for accurate and reproducible conductivity measurements is
a clean cell. A dirty cell changes the conductivity of a solution through contamination. Clean
the cell thoroughly before storing it. To clean the conductivity cell:
1. Dip the cell in cleaning solution and agitate for two
to three minutes. Any foaming acid tile cleaner, such
as Dow Chemical Bathroom Cleaner, should clean
adequately. For a stronger cleaner, use a solution of
1:1 isopropyl alcohol and 1 N HCl. Remove the cell
from the cleaning solution.
2. Use the nylon brush (supplied) to dislodge any
contaminants from inside the electrode chamber.
Repeat steps one and two until the cell is completely
clean. Rinse the cell thoroughly in deionized, or clean tap water.
