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C-2) Zero Dissolved Oxygen Calibration: (Laboratory calibration with Na
NOTE: Generally need to do zero oxygen calibration in the situation of replacing
new electrode, replacing membrane cap, and long time without using. To do zero dissolved
oxygen calibration by the following steps:
1) Connect the electrode to the meter.
2) Use the beaker by dissolving approximately 10 grams of Na
distilled water.
3) Place the electrode in the Na
press and hold MODE+CAL buttons to enter calibration mode, press MODE+ADJ+UNIT buttons
again to enter "DO %0.0" mode, then press and hold SET button to save and screen shows "SA" to complete
calibration.
Press and hold MODE+CAL buttons, screen shows "ESC" momentarily and return to normal measurement
mode
C-3) 100% Air-Saturated Water Calibration: (Laboratory calibration with stirrer)
1) Connect the electrode to the meter.
2) Pour 100ml deionized water into a 150mL beaker. Use an air bubbler or some
type of aerator to bubble air through the water while stirring for 20 minutes until
the water becomes completely saturated with air.
3) Place the electrode in the air-saturated water and wait for the reading to stabilize,
press and hold MODE+CAL buttons to enter calibration mode, screen shows "DO %100", then press and hold SET
button to save and screen shows "SA" to complete calibration. Press and hold MODE+CAL buttons, screen shows
"ESC" momentarily and return to normal measurement mode.
SALINITY CORRECTION
Due to the solution contains significant concentration of salinity affects the read out values of DO.
Thus, to correct salinity value is required in order to get the accurate DO reading.
(Refer to page 8, CHART 1. for reference). Use a salinity meter to get the salt concentration reading.
1) To enter the known salinity value by long press SET button and the screen shows "SAL".
HOLD: ↑to increase ADJ: ↓to decrease
SET: ← to left digit CAL: → to right digit
Adjustable range is 0 to 45.2 ppt.
2) After setting completed, press and hold MODE button to save setting, screen shows "SA"
to complete setting. To escape the setting by press and hold SET button, screen shows
"ESC" and return to normal measurement mode.
BAROMETRIC PRESSURE SETTING:
If you are performing measurements at an altitude different from sea level 760 mmhg
(default value). It is important to enter correct barometric pressure as barometric
pressure affects DO values.
1) To enter the known pressure value by long press SET button and the screen shows "SAL".
Then, press MODE button again to switch to the pressure setting mode, screen
shows "P".
HOLD: ↑to increase ADJ: ↓to decrease
SO
solution and wait for the reading to stabilize,
2
3
(Refer to page 9, CHART 2. for reference)
SO
powder)
2
3
SO
in 500 ml of
2
3
7
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