3.2 Press the Cal key, the display shows 100.0% / CAL1.
3.3 Hold the dissolved oxygen electrode in the air at 100% relative
humidity or place the electrode into the air-saturated water for
10 minutes. Press the Enter key, the meter begins the calibration.
3.4 When the reading has stabilized, the meter will show and
return to the measurement mode.
2 Points Calibration
4.1 Ensure that you have selected 2 points calibration in the setup
menu.
4.2 Press the Cal key and the key, the meter shows 0% / CAL1.
4.3 Place the electrode into the zero oxygen solution for 10 minutes
and stir gently. Press the Enter key to begin the calibration.
4.4 When the reading has stabilized, the display will show 100% /
CAL2. The meter prompts you to continue with second point
calibration.
4.5 Place the electrode into the air-saturated water for 10 minutes
and stir gently. Press the Enter key to begin the calibration.
4.6 When the reading has stabilized, the meter will show and
return to the measurement mode.
To exit the calibration without saving changes, press the Meas key.
Dissolved Oxygen Measurement
The meter can be used to measure the water, wastewater, brine and
other liquids. If your sample is seawater or water containing large
amounts of salt, make sure to set the salinity coefficient before
measurement. Some gas and steam such as chloride, sulfur dioxide,
sulfureted hydrogen and carbon dioxide can permeate the membrane
via diffusion. Their existence will influence the measurements. If the
sample contains the solvent, grease, sulfide and alga, the membrane
will be damaged or eroded.
1. Set the barometric pressure and salinity coefficient in the setup
menu.
2. Rinse the dissolved oxygen electrode with distilled water. Place
the electrode into the sample solution and stir gently. Wait for the
measurement to stabilize and record the reading.
3. If the Auto-Hold option in the setup menu is enabled, the meter
will automatically sense a stable reading and lock measurement,
the icon appears on the display. Press the key to resume
measuring.
If the option is disabled, the meter will continuously measure and
update the readings.
• If the meter shows ---- indicating the measurement exceeds the
range, remove the electrode from the sample immediately.
• To record the measurement at the predefined time intervals, refer
to the Interval Readings section on page 40.
Electrode Maintenance
• Rinse the dissolved oxygen electrode thoroughly with distilled
water after use.
• Do not touch the membrane and always keep it is clean and wet.
• If you do not use the electrode for long periods, screw off the
membrane cap and rinse the electrode anode, cathode, membrane
cap with distilled water and blot dry. Install the electrode and
store dry.
Appendix
Preparation of Zero Oxygen Solution
Dissolve 500 mg of the sodium sulfate (Na
2
SO
3
) reagent and a small
amount of cobalt (II) chloride hexahydrate (CoCl
2
• 6H
2
O) in the 250 ml
distilled water, mix the solution until reagent is completely dissolved.
Preparation of Air-Saturated Water
Use an air-pump to blow air into distilled water at least 1 hour, while
stirring the solution.
Optional Accessories
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