10
7+Series Version 2.0
pH Meter Calibration
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.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH 7.00 buffer solution. Stir the solution gently
and leave it 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.
Er 2 displays if press key before the value is stable.
When the meter locks 7.00 pH, stable icon displays on LCD. Press key to calibrate the meter.
“End” icon appears after calibration is done. After the 1
st
point calibration, the meter’s display will show at the top
right a blinking CAL2, and show at the bottom right blinking 4.00pH and 10.01pH alternately, indicating using pH4.00
or pH10.01 buffer solution to make the 2
nd
point calibration.
Take out pH electrode，rinse it 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, stability icon displays on LCD. Press key to calibrate the meter.
Display shows “End” and slope.
The meter’s display will show at the top right a blinking CAL3, and show at the bottom right blinking 10.01pH,
indicating using pH10.01 buffer solution to make the 3
rd
point calibration.
Take out pH electrode，rinse it 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 will show
scanning and locking process of calibration buffer solution at the bottom right of LCD. When the meter locks 10.01 pH,
stable icon appears on LCD. Press key to calibrate the meter.
Display shows “End” icon and slope. Than the meter goes automatically to the measurement mode, displays stable
measuring value and calibration guide icons.
During the calibration process, press key to exit from the calibration mode. The meter can perform one-
point, two-point and three-point calibration. Calibration guide icons appear on LCD.
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