take the reading after the smiley face icon shows up.
4.3.2. To measure in static water: Insert DO electrode into water, water surface level
should should be higher than the location of the thermistor, the angle for the
electrode and water should be 45° to 75°, quickly move the electrode in water
(speed>5cm/s), hold 3 to 5 minutes to take the reading after smiley face icon shows
up.
4.3.3. To test in the water with slower flowing speed: Use the method from 4.3.1., but the
moving speed of the electrode should be higher.
4.4 Special Notes
4.4.1. The air temperature and water temperature should be close to each other when
calibrating (≤10℃). If the difference is large, please dip the electrode into the
sample water for about 10 minutes, then insert the electrode into the calibrate
cover for 5 to 6 minutes according to 4.2.1 and press the key to finish the
calibration.
4.4.2. After each power-on, the meter must be polarized and calibrated. So do not turn
off the meter while using (when in the DO mode, the auto power off function is
turned off by default).
4.4.3. During DO test, temperature affects a lot on the measuring value. Because the
thermistor of DO electrode is installed on the electrode housing (directly touching
the water), the thermistor and DO sensor have different sensing ablilities on the
waer’s temperature. Generally, it will take 3 to 5 minutes to make the thermistor
temperature and the actual temperature of the electrolyte within the electrode reach
the same level. So the reading time must be > 3 minutes, otherwise there will be
some fairly large errors, especially when the electrode temperature and water
temperature have larger difference (will need to extend the reading time).
4.4.4. DO measurement also can be affected by Barometric pressure (please see chart
Ⅲ and Ⅳ). This meter has manual Barometric pressure compensation function.
Once the measuring value is adjusted, the accuracy can be ganruanteed.
4.4.5. DO electrode can not be tested in a static maner in static water, otherwise it will
lead the results to be lower.
4.4.6. When measuring, there can not be any bubbles on the membrane surface of the
DO electrode, which touches with water, otherwise it will affect the measuring
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