Calibrating A Ph Electrode; Automatic Calibration With Specified Buffer Solutions - Testo 252 Bedienungsanleitung

16
Calibrating a pH electrode/Automatic calibration
Calibration should always be carried out
before the first measurement. This should
be repeated before every measurement
when carried out in extreme solutions or
when a very high level of accuracy is
to be achieved.
The calibration possibilities of testo 252 are vast .
The main possibilities are as follows:
1 point calibration and
2 point calibration,
whereby the temperature curve which corresponds
with the pH value necessary for calibration is
entered automatically or manually
(depending on whether you wish to use a Testo
buffer solution (or DIN buffer) or your own buffer
solution for calibration). With automatic calibration,
3 point calibration is possible.
The following DIN buffer solutions are
permitted for 3 point calibrations:
pH 4.008; pH 6.865; pH 9.180
Automatic calibration with specified
buffer solutions
When a Testo buffer or DIN buffer is used, the
temperature dependence is automatically taken
into consideration and compensated, according
to the temperature value which has been entered
or measured (should you not be using a Testo or
DIN/NBS buffer, you can skip the following pages
and go to the chapter on manual calibration).
cf. descriptions of the pH electrodes from page 46
and from page 64.
pH measurement