Operation; Calibration; Buffer Group - OHAUS a-AB23PH Mode D'emploi

AB23PH Bench pH Meter

4. OPERATION

Standard procedure of pH measurement is as follows:
a) pH electrode preparation
b) Buffer preparation and pH electrode calibration
c) Sample preparation
d) pH measurement
e) Record measurement results or print
f) Rinse the pH electrode and properly store
pH electrode preparation: pH electrode should be rinsed with pure water before and
after using. Check if the electrode is physically damaged. (Be careful with the glass
bulb.)
The pH electrode should be stored in the storage bottle; the solution in the bottle is 3M
KCl solution. After placing the pH electrode into the sample or buffer solution, user
should stir several seconds then wait 30 to 60 seconds for the signal to stabilize, and
then press the button to operate (Calibration or measurement).
WARNING Do not operate the equipment in hazardous environments. The
equipment is not explosion protected.
WARNING When using chemicals and solvents, comply with the instructions
of the chemical producer and the general lab safety rules.
4.1

Calibration

4.1.1

Buffer group

This meter supports 1-, 2- or 3- point calibrations.
There are2 buffer groups in the meter, you can select the buffer group you prefer. The
default buffer is b1 US standards. The buffer value will be automatically recognized
during calibration. The 2 predefined buffer groups are (at 25°C):
b1 1.68
1.68
b2
The meter automatically corrects for the temperature dependence of the buffer pH
values given in the following table - buffer group b1.
This means, if the buffer solutions' temperature is 15°C, the calibration value you will get
should be pH1.67 (buffer 1.68), pH4.00 (buffer 4.01), pH7.04 (buffer 7.00), pH10.12
(buffer 10.01) and pH12.81 （buffer 12.45）.
4.01 7.00 10.01
4.01 6.86 9.18
12.45
12.45
EN-9