Xylem CG 842 - Manual (Page 28)

Operation
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4.3.2 AutoCal DIN
Use two different DIN buffer solutions for this procedure:
Note
Steps 2 and 6 are not required if you use a temperature
probe.
DIN buffer solution pH
A 1.68
C 4.01
D 6.87
F 9.18
1 Press the <CAL> key repeatedly until Cd1 and the
AutoCal DIN function display appear.
2 If necessary, set the temperature of the buffer solu-
tion by pressing < ▲ > < ▼ >.
3 Submerse the pH electrode in the first buffer solution.
4 Press the <run/enter> key.
AR flashes on the display.
The electrode voltage (mV) appears on the display.
As soon as a stable value is recognized, Cd2 ap-
pears.