DO700-en-GB_v2.3 3/15
16
Dissolved Oxygen (DO) Measurements
Preparation
Remove the DO electrode from the solution bottle.
Determine if the sponge inside the bottle is moist. If not, moisten the sponge but do not allow
excess water in the bottle.
Small air bubbles are acceptable in the electrode but larger air bubbles should be removed. To
do so, remove the membrane cap and add electrolyte. Connect the electrode to the meter and
allow for a 15-minute polarization.
Press the power key to turn on the meter (the DO indicator should appear).
Press and hold the ENTER key to select the desired unit of measure (mg/L, ppm, %); then
release.
1.
DO electrode
2.
Calibration cover cap
3.
Calibration cover
4.
Water soaked sponge
5.
Calibration cover bottom
6.
Temperature electrode
7.
Membrane cap
8.
Cathode (gold)
9.
Anode
10. Salinity electrode
Calibration
Use the percentage (%) unit of measure for calibration.
Press the CAL key to enter the Calibration mode (the flashing CAL icon will appear on the
meter’s LCD).
Put the DO electrode into the calibration solution (calibration container that the probe was
housed in upon delivery) and tightly secure the cap of the calibration solution, place vertically
and allow polarizing for 3 to 5 minutes.
When the reading stabilizes the smile face icon
appears on the LCD. Press the CAL key
again.
The LCD will display a flashing ‘100%’ indicating that the calibration is complete. After several
seconds the meter will display ‘END’ and return to the measuring mode.
If the displayed reading does not stabilize, polarize again per the Preparation section above,
and retry this calibration procedure.
