4.2 DO Calibration (Saturated Oxygen)
Power on the meter, press key, the meter enters calibration mode, CAL will be flashing
at the upper-right corner. Insert the DO electrode to the calibration sleeve, and tighten the
sleeve cap. Let the electrode sit for 3 to 5 minutes.
When the reading is fully stabilized, press key again to finish the calibration. A flashing
100% will show up, and the calibration will be finished in several seconds and the meter will
return to measurement mode. If the reading is unstable, please wait for several more
minutes. Do NOT press key until the reading is fully stabilized.
4.3 DO Measurement
4.3.1. Measuring DO in flowing water
Power on the meter. Place the DO electrode into the flowing water. The water surface level
should be higher than the location of the temperature electrode. The angle for the electrode
and water surface should be 45° to 75°. Hold the electrode in the flowing water and wait for
a stable reading, then press to record the measurement. If the reading cannot be
stabilized, keep swirling the electrode slowly in water to help you get a stable reading
(typically takes 1-5 minutes).
4.3.2. Measuring DO in static water
Power on the meter. Place the DO electrode into water. The water surface level should be
higher than the location of the temperature electrode. The angle for the electrode and water
should be 45° to 75°. Keep swirling the electrode in water slowly (>5cm/s) for 1 to 5 minutes.
When the reading is fully stabilized, record the measurement (do NOT stop the swirling while
recording the measurement).
Never stop the DO electrode swirling in static water while measuring. Otherwise the
dissvolved oxygen will be consumed by the DO electrode and the reading will keep dropping.
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