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BKI 11 ATEX 0012 X
4.2.1.
Periodic calibration of the pH electrode
The calibration has to be done minimum in two measuring points (using two different buffer solutions). The calibration points have to be selected so that the widest
measuring range is covered. The common calibration points are 4.00pH and 10.00pH, 4.00pH and 7.00pH, 7.00pH and 10.00pH, or even more points for example
4.00pH, 7.00pH and 10.00pH.
Recommended solutions:
O
RDER
C
ODE
D
ENOMINATION
4vpuf4ph50mph
Buffer solution pH4 / 50 ml
4vpuf4ph250ph
Buffer solution pH4 / 250 ml
4vpuf4ph100ph
Buffer solution pH4 / 1 l
4vpuf7ph50mph
Buffer solution pH7 / 50 ml
4vpuf7ph250ph
Buffer solution pH7 / 250 ml
4vpuf7ph100ph
Buffer solution pH7 / 1 l
4vpuf10ph50ph
Buffer solution pH10 / 50 ml
4vpuf10ph25ph
Buffer solution pH10 / 250 ml
4vpuf10ph10ph
Buffer solution pH10 / 1 l
4vtarkcI 350ph
Storage solution KCl 3 mol / 50 ml
4vtarkcl 250ph
Storage solution KCl 3 mol / 250 ml
4vtarkcl 310ph
Storage solution KCl 3 mol / 1 l
4vtiszold 25ph
Cleaning solution / 250 ml
The given pH values refer to 25°C. The temperature dependency is given by the manufacturer, usually in a table on the label of the bottle.
The calibration procedure is described in chapter 6.5