Aquasafe WSL50 Pro, Instruction Manual

Page: 169 / 193

5.4 pH Calibration with User-Defined Buffers:
5.4.1
Ensure that the “USER” option is selected in the setup menu.
N.B. Custom buffer solution values should be at least 1 pH unit apart.
5.4.2 Rinse the pH electrode with distilled water. Immerse the electrode in the
custom buffer solution. Stir the solution gently. The meter shows the
current measured value.
5.4.3
Press ▲ or ▼ key to increase or decrease displayed value
according to the value of the custom buffer, and press ENTER key to confirm.
“Calibration” indicator begins flashing.
5.4.4
Wait for the measured value to stabilize, the display shows “CAL2”. The
meter prompts to continue with second calibration point.
5.4.5 Rinse the pH electrode with distilled water. Immerse the electrode
in the next custom buffer solution.
5.4.6
Press ▲ or ▼ key to increase or decrease displayed value
according to the value of the custom buffer, and press ENTER key to confirm.
“Calibration” indicator begins flashing.
5.4.7
Wait for the measured value to stabilise, the display shows “END”.
Once calibration is complete,
the meter returns to
measurement mode automatically.

During the calibration process, to exit the calibration mode, press the
ON/OFF key; the meter will return to measurement mode immediately.

The electrode slope indicator shows average slope of the pH electrode
after calibration. When the electrode or calibration result does not meet
measurement requirements, the indicator will disappear on the display.