10
(c) After measuring a solution that contains fluoride or a concentrated organic
solution
(d) If the solution’s temperature differs greatly from the calibration solution
temperature
4.2.4. Due calibration
Preset calibration interval (begin from the date of last calibration) to remind due
calibration in a preset period in parameter setting P1.4 (Section 7.3). During due calibration, Er5 icon
appears on LCD (see Diagram – 9). The meter can not continue operation and Er5 icon disappears until
the calibration is done, or
when select “No” in parameter setting P1.4.
4.2.5. Check calibration date
Check the date and time of last calibration to decide whether new calibration is
needed. Please refer to parameter setting P1.5 (Section 7.3).
4.3 pH Calibration (take three-point calibration as an example)
4.3.1. The 1
st
point calibration
a) Press key to enter the calibration mode, CAL 1 flashes at the top right
of LCD and “7.00 pH” flashes at the bottom right of LCD, indicating using pH
7.00 buffer solution to make the 1
st
point calibration.
b) Rinse pH electrode in distilled or deionized water, allow it to dry, and
submerge it in pH7.00 buffer solution. Stir the solution briefly and allow it to
stay in the buffer solution until a stable reading is reached. LCD displays
stable , press to finish 1
st
point calibration, meter goes to
measurement mode, the bottom left of LCD indicating , See Diagram – 10.
4.3.2. The 2
nd
point calibration
Press key to enter the calibration mode, CAL 2 flashes at the top right of LCD, indicating make the 2
nd
point calibration. rinse pH electrode in distilled or deionized water, allow it to dry, submerge it in pH4.00
buffer solution, Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is
reached. The meter’s display will show scanning and locking process of calibration buffer solution at the
bottom right of LCD. When the meter locks 4.00 pH, stable icon displays and stays on LCD. Press
the key to calibrate the meter. electrode slope of acidity range display after calibration is done, the
2
nd
point calibration finished, meter goes to measurement mode, the bottom left of LCD
indicating .
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