pH Calibration:
The HL101 pocket pH/temperature tester allows up to 3 point calibration. We recommend that
you perform at least a 2 point calibration for best accuracy. The unit automatically recognises
and calibrates to the following standard buffer values.
● USA Standard Buffer Options: pH 4.01, 7.00, 10.01
● NIST Standard Buffer Options: pH 4.01, 6.86, 9.18
Single point calibration should only be carried out with pH 7.00 or pH 6.86, otherwise the
calibration will not be accepted by the unit.
The unit must be calibrated prior to first use or whenever the electrode is replaced. To ensure
optimum accuracy, regular calibration is recommended. Do not reuse calibration solution after
calibration, contaminants in solution will affect the calibration and eventually the accuracy of
the measurement.
SINGLE
POINT
CALIBRATION:
1.1
Ensure that 1 point calibration is selected in the setup menu.
1.2
Rinse the pH electrode with distilled water. Press CAL key; the unit
shows “pH7.00/CAL1”
or “pH6.86/CAL1”.
1.3
Immerse the pH electrode in the pH7.00 buffer solution; the end of the sensor must be
completely submerged in the calibration solution. Stir the solution gently.
1.4
Press ENTER key to confirm. Wait for the measured value to stabilise; the display shows
“END”. Single point calibration is completed.
2 POINT CALIBRATION:
2.1
Ensure that 2 point calibration is selected in the setup menu.
2.2
Repeat steps 1.2 to 1.4 above. When the first calibration point is completed, the display
will show “CAL2”. The unit prompts you to continue with second point calibration.
Cal
Enter
