
Calibration:
<pH>
1. Make sure the sensor is 3-in-1 electrode, remove the
soaking bottle, and switch to pH mode.
2. Dip the electrode into the buffer solution pH 7.00. Stir gently
and wait until the reading is stable. Press and hold for
3 sec. to enter calibration mode. The display will appear
CAL and flashing 7.00. When the display stops flashing and
indicates “SA", then "End” while calibration ends, and will
return to measurement mode.
2. Rinse the electrode with clean water and wipe it dry. Dip
the electrode into the buffer solution pH 4.01 as previous
steps.
3. After slope calibration, pH 4.01 or pH 10.01, the display will
indicate the percentage of slope (PTS) to show the status
of the electrode. If the PTS is below 70% or above 130%,
the electrode must be replaced. A slope of 100% is ideal.
Note :
1. Calibration error indicator icon will appear, and “Err” instead
of “SA”, if calibration fails.
2. When doing a 2 or 3 point calibration, Calibrate with buffer
pH 7 first, and then follow with buffer pH 4 or pH 10.
<ORP>
Calibration is not necessary for ORP. However, it could be
tested with specific ORP standard solution to check whether
the electrode is good.
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