8. When the reading has stabilised, press the key to calibrate. If a 1
point calibration has been performed, a " ∗∗ " in place of the decimal point
will not be removed until a full 2 point calibration has been performed.
9. Rinse the pH and Temperature sensors in distilled water and blot them dry.
10. Place both sensors into a small sample of secondary buffer (pH4.00, pH9.23
or pH10.01) so that the bulb and reference junction are both covered, as per
the diagram in step 7 above.
DO NOT place the sensor directly into the buffer bottle.
NOTE: pH9.23 and pH10.01 buffers are highly unstable. Avoid using
these buffers if possible. Discard immediately after use.
When the reading has stabilised, press the key to calibrate.
The " ∗∗ " in the pH reading will now be replaced by a decimal point if
calibration was successful.
11. The 901-PH is now calibrated and is ready for use.
Discard the used samples of buffer.
3.2 Calibration Notes
1. A 1-point calibration should be performed at least weekly. In applications
where the sensor junction can become blocked (eg. wines, dairy products,
mining slurries etc) a 1-point calibration may have to be done daily.
2. A full 2-point calibration should be performed at least monthly. Of course,
more frequent calibration will result in greater confidence in results.
3. All calibration information is retained in memory when the 901-PH is
switched off, even when the power supply is removed.
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