sec. to enter calibration mode. The display will appear
CAL and flashing 101.7％. When the display stops
flashing and indicates “SA", then "End” while
calibration ends, and will return to measurement
mode.
4. Optional ’zero oxygen’ calibration: (improves
measurement accuracy for very low or very high DO
measurements). Place the probe into a zero oxygen
calibration solution, such as 5% sodium sulfite, wait for
stability and press and hold to enter calibration.
Stability in a zero solution may take many minutes,
depending on probe history.
Note:
1. The icon O
2
will display automatically during
calibration mode.
2. Calibration error indicator icon will appear, and “Err”
instead of “SA”, if calibration fails.
3. If the reading is not 0 ％ while the probe is not
connected, calibrate it in the air without probe to make
reading becomes 0％.
Measurement:
<pH>
1. Press to choose pH mode.
2. After calibration, rinse the pH electrode with clean
water and wipe it dry. Dip the electrode into the sample
solution which is going to be measured. Stir gently and
wait until a stable reading can be obtained.
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