Instruction Manual
pH 5/6 & Ion 6
9
3.2.2
pH Calibration using USA standard buffers
1. Pour a known pH buffer standard solution into a clean, dry container, e.g. pH 7.00.
Power on the meter and it automatically enters into measurement mode. Select pH
mode by pressing
MODE
key if necessary.
2. Dip both pH electrode and temperature probe into pH 7.00 buffer solution. Swirl
gently and wait for reading to stabilise (approx. 30 seconds depending on your
electrode condition).
3. Press
CAL
key to enter pH calibration mode. A “
CA
” displays momentarily and the
display shows the current uncalibrated reading flashing while in the calibration
mode.
4. To abort or cancel calibration without accepting new value, press
CAL
key. The
meter then reverts to pH measurement mode.
5. To proceed calibration, allow reading to stabilise. The meter automatically
recognises pH 4.01, 7.00 or 10.01 buffers. Press
ENTER
key to confirm calibration
and the LCD displays “
CO
” momentarily. The meter reverts to measurement mode.
6. For 2 or 3-point calibration, repeat step 3 with other pH buffer values of 4.01 and/or
10.01 for higher accuracy.
