User Manual

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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.
Figure-8
Figure-4