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5.4
pH Meter Calibration
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.
2) Use distilled water to rinse off electrode and then dry it (with a tissue).
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 5).
3) When the meter locks 7.00 pH in the lower right corner, stable
icon displays on LCD. Then 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 pH4.00 or pH10.01 buffer solution
to make the 2
nd
point calibration.
4) Take out the 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 corner. When the meter recognizes 4.00 pH, stable icon
displays on LCD. Press key to calibrate the meter.
End
icon and
electrode slope of acidity range will be displayed 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.
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, stable icon 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, the calibration icons
L M
H
will be displayed. Please see Figure-7 for the above calibration process.
Figure-7
