25
4.5 pH Calibration Notes
1.
DO NOT
place the electrodes directly into buffer bottles. Decant a small quantity and discard
after use.
2.
pH9.23 and pH10.01 buffers are highly unstable. Avoid using these buffers if possible.
Discard immediately after use
.
3.
A 1 point calibration should be performed at least weekly. In applications where the electrode
junction can become blocked such as dairy products, mining slurries etc, a 1 point calibration
may have to be done daily.
4.
A full 2 point calibration should be performed at least monthly. Of course, more frequent
calibration will result in greater confidence in results.
5.
All calibration information is retained in memory when the
smart
CHEM
-Titro
is switched off,
even when the power supply is removed. This information can be recalled or printed later using
the GLP function (see section 10).
6.
When a 3 point calibration has been successfully performed, an extra line appears in the GLP
Recall (section 10.1) and the GLP print-out (section 10.3) labelled “
SlopeB
”.
7.
To clear the Slope B from a 3 point calibration without losing all other calibration data, please
refer to the section regarding Initialisation (section 15).
