4.3 pH Meter Calibration (with an example of three-point calibration)
4.3.1. First point calibration
(a) Press key to enter into the calibration mode, “CAL 1”
blinks at the top right of LCD and “7.00 pH” blinks 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 pure 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. When stable icon displays
on LCD, press key to calibrate, then 1
st
point calibration is finished, the
meter enters in measurement mode of one-point calibration. Calibration
guide icon displays at the bottom left of LCD. See Diagram-6.
4.3.2. Second point calibration
Press key to enter into the calibration mode, “CAL 2”
blinks at the top right of LCD indicating to make the 2
nd
point calibration.
Rinse pH electrode in pure water, allow it to dry, and 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
on LCD, press key to calibrate the meter. LCD will display electrode
slope of acidity range, then 2
nd
point calibration is finished, the meter enters in measurement mode of two-
point calibration. Calibration guide icons display at the bottom left of LCD.
4.3.3. Third point calibration
Press key to enter into the calibration mode, “CAL 3” blinks at the top right of LCD indicating to make
the 3
rd
point calibration. Rinse pH electrode in pure water, allow it to dry, and submerge it in pH10.01 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 10.01pH, stable icon displays on LCD, press key to calibrate the
meter. LCD will display electrode slope of alkalinity range, then 3
rd
point calibration is finished, the meter
enters in measurement mode of three-point calibration. Calibration guide icons
display at the bottom left of LCD.
Notes:
(a) The meter can perform 1-3 points calibration. When the 1
st
point calibration is done, the meter will enter
into 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 appear and the
key is pressed, then Er 2 displays. See chart – 5.
(c) To exit from the calibration mode, press key.
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