11
4.3.3. The 3
rd
point calibration
Press key to enter the calibration mode, CAL 3 flashes at the top right of LCD indicating make the 3
rd
point calibration. rinse pH electrode in distilled or deionized water, allow it to dry, submerge it in pH10.01
buffer solution, Stir the solution briefly and allow it to stay in the buffer solution until the reading is
stabilized. The meter’s display will show scanning and locking process of calibration buffer solution at the
bottom right of LCD. When the meter locks 10.01pH, stable icon displays and stays on LCD. Press
key to calibrate the meter. Electrode slope of acidity range display after calibration is done. After the
3
rd
point calibration is completed, meter goes to measurement mode, the bottom left of LCD
indicating .
Notes:
(a) The meter can perform 1-3 points calibration. When the 1
st
point calibration is done, the meter will
enter measurement mode of one-point calibration. Two-point and three-point calibration are in the same
manner.
(b) During the calibration process, if measuring value is not stable yet (when does not stay on and the
key is pressed, then Er 2 will display. (See chart – 5). To solve the problem, simply wait for to
stay on the screen before pressing
(c) To exit from the calibration mode, press key.
4.4 Customer-defined Calibration (take 1.60 pH and 6.50 pH calibration solution as an
example)
4.4.1. Select CUS from parameter setting P1.1 (please refer to Section 7.3 for customer-defined solution).
The meter enters Customer-defined calibration mode.
4.4.2. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in pH1.60 buffer
solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached.
When LCD displays the stable measuring value and icon, press key and the measuring value
flashes. CAL1 flashes at the top right of LCD, indicating 1
st
point calibration of customer-defined solution.
Press key or key to adjust the measuring value to 1.60, then press key to calibrate the
meter. After calibration is done, meter goes to measurement mode.
4.4.3. Rinse pH electrode in distilled or deionized water, allow it to dry, and submerge it in pH 6.50 buffer
solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached.
When LCD displays the stable measuring value and icon, press key and the measuring value
flashes. CAL 2 flashes at the top right of LCD, indicating 2
nd
point calibration of customer-defined solution,
press key or key to adjust the measurement value to 6.50, then press key to calibrate the
meter. After calibration is done, the meter returns to the measurement mode.
Notes:
a) For manual temperature compensation (no temperature probe is plugged in RCA socket), when
is pressed, temperature value flashes. Press key or key to adjust the temperature value, and
then press key, pH measuring value flashes.
b) The meter can perform 1-2 points customer-defined calibration. When the 1
st
point calibration is done,
the meter goes to measurement mode automatically. Same in customer-defined 2
nd
point calibration.
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