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.
Customer calibration
example of 1.60pH and 6.50pH calibration solution
Select CUS in the setup menu P1.1. The meter enters into Customer-defined calibration mode. Press key,
the meter’s display show a blinking CAL1 icon at the top right of LCD, indicating the meter enters into the 1st
point customer-defined calibration.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH1.60 buffer solution. Stir the solution
briefly and allow it to stay in the buffer solution until a stable reading is reached. For automatic temperature
compensation (ATC), the temperature value does not blink. When press key, the main value blinks.
Press and keys to adjust the main value to 1.60, then press key to calibrate the meter. After
calibration is done, LCD at the top right shows blinking CAL2 icon, indicating the meter enters into the 2nd point
customer-defined calibration.
Note: For manual temperature compensation (MTC), when LCD displays the stable measuring value and
icon, press key, then the temperature value blinks, press and keys to adjust the temperature
value, and press key to confirm it. Then the main value blinks. Follow the above procedures to adjust
the main value and calibrate the meter.
Rinse pH electrode in pure water, allow it to dry, and submerge it in pH 6.50 buffer solution. Stir the solution
briefly and allow it to stay in the buffer solution until a stable reading is reached. For automatic temperature
compensation (ATC), the temperature value does not blink. When press key, the main value blinks.
Press and keys to adjust the main value to 6.50, then press key to calibrate the meter. After
calibration is done, the meter goes to the measurement mode.
Note: For manual temperature compensation (MTC), when LCD displays the stable measuring value and
icon, press key, then the temperature value blinks, press and key to adjust the temperature
value, and press key to confirm it. Then the main value blinks. Follow the above procedures to adjust the
main value and calibrate the meter.
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