35
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A180/181
Dissolved Oxygen Calibration
The A series meter allows 1 or 2 points calibration in the dissolved
oxygen mode. If you have selected the 1 point calibration in the setup
menu, we recommend that you perform a 100% saturation calibration
in the air-saturated water. If the 2 points calibration is selected, the
zero oxygen solution needs to be used.
During the calibration and measurement, the temperature sensor on
electrode must be immersed in solution completely and the solution
should keep 0.3 m/s of minimum flow rate to avoid oxygen starvation
at the membrane.
Temperature sensor
DO Calibration in mg/L or ppm Mode
1.1 Ensure that the meter is in DO (mg/L) mode and you have select
the 1 point calibration in the setup menu.
1.2 Press the
Cal
key, the screen shows "Calibration point 8.26 mg/L".
1.3 Place the dissolved oxygen electrode into the air-saturated water
for 10 minutes and stir gently. Press the
Enter
key to begin the
calibration.
1.4 Wait for the dissolved oxygen reading to stabilize, the meter will
show "Calibration is completed" and return to the measurement
mode.
2 Points Calibration
2.1 Ensure that you have selected 2 points calibration in the setup
menu.
2.2 Press the
Cal
key and
key, the screen shows "Calibration point
0.00 mg/L".
2.3 Place the electrode into the zero oxygen solution for 10 minutes
and stir gently. Press the
Enter
key to begin the calibration.
Air-saturated water