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5.
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.
5.1 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 16 for a detailed
explanation.
4. Select pH Mode (
→
→
→
→
F3:Mode
→
→
→
→
F1:pH
). Bendall’s Mode may be
On or Off.
5. Ensure that temperature has already been calibrated, or manually set
(see sections 8.1 and 8.4). 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 sensors into a small sample of pH7.00 (or pH6.86) buffer,
so that the bulb and reference junction are both covered, as per the
diagram over the page.
DO NOT
place the sensors directly into the buffer bottle.