4. pH Calibration
A “ ∗ ” in place of the decimal point indicates that the pH readout is not
calibrated, or a past calibration has failed. The “ ∗ ” will be removed once
a full two-point pH calibration has been successfully performed.
4.1 Calibration Procedure
1. Plug the pH sensor into the pH/mV socket and the temperature
sensor into the Temperature socket.
2. Switch the meter on.
3. Ensure that you are using buffers which have been selected for
automatic buffer recognition. See section 14 for a detailed
explanation.
4. Select pH Mode ( →→ F3:Mode →→ F1:pH).
5. Ensure that temperature has already been calibrated, or manually set
(see sections 7.1 and 7.4). NOTE: If the decimal point in the
temperature reading is shown by a " ∗∗ ", then the temperature readout
is not calibrated.
6. Remove the wetting cap from the pH sensor.
7. Rinse the pH and Temperature sensors in distilled water and blot
them dry.
8. Place both electrodes into a small sample of pH6.88 (or pH7.00)
buffer, so that the bulb and reference junction are both covered, as
per the diagram over the page.
DO NOT place the electrodes directly into the buffer bottle.
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