4.3 pH Calibration (Take 3-point calibration as an example)
4.3.1 Press to enter calibration mode. CAL1 icon will flash in the
upper right corner of the LCD. 7.00 pH will flash in the lower right corner
of the LCD, reminding you to use pH 7.00 buffer to conduct 1
st
point of
calibration.
4.3.2 Use distilled water to rinse off electrode and then dry it. Dip it into
pH 7.00 buffer solution, stir gently and let it stand still and wait for the
reading to become stable. In the lower right corner of LCD, the process
of auto recognizing the buffer solution will be displayed. Pressing
before the buffer is recognized will generate Er2 (please refer to table
6).
4.3.3 When the meter locks 7.00 pH, displays on LCD. Press
key to calibrate the meter. End icon appears after calibration is done.
The 1
st
point calibration is finished. In the meanwhile, CAL2 will flash at
the upper right corner, and 4.00 pH & 10.01 pH will flash alternately at
the bottom right, indicating using pH 4.00 or pH 10.01 buffer solution to
make the 2
nd
point calibration.
4.3.4 Take out pH electrode, rinse it in distilled water, dry it, and dip it
into pH 4.00 buffer solution. Stir the solution gently and let stand still in
the buffer solution until a stable reading is reached. The meter’s display
will show the recognition process of calibration buffer solution at the
lower right of LCD. When the meter recognizes 4.00 pH, displays
on LCD. Press key to calibrate the meter. End icon and electrode
slope of acidity range display after calibration is done. In the meanwhile,
CL3 will flash at the upper right corner of the LCD, and 10.01 pH will
flash at the lower right, indicating using pH10.01 buffer solution to make
the 3
rd
point calibration.
4.3.5 Take out pH electrode, rinse it in distilled water, dry it, and dip it
into pH 10.01 buffer solution. Stir the solution gently and let it stand still
in the buffer solution until a stable reading is reached. The meter’s
display will show recognition process of calibration buffer solution at the
bottom right of LCD. When the meter recognizes 10.01 pH,
displays
on LCD. Press key to calibrate the meter. End icon and electrode
slope of alkalinity range display after calibration is done. The meter
returns to the measurement mode, displays stable measuring value and
calibration guide icons. Please see Figure-4 for the above calibration
process.
During the calibration process, press key to exit from the calibration
mode. Correspondent calibration guide icons will appear on the LCD.
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