Xylem CG 843 - Manual (Page 29)

Operation
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4.3.2 AutoCal TEC
Use any two or three of the Technical buffer solutions for this
procedure in increasing or decreasing order.
Note
Steps 2, 6 and 13 are not required if you use a temperature
probe.
1 Press the <CAL> key repeatedly until Ct1 and the
AutoCal TEC function display appears.
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,
Ct2 ap-
pears.
5 Thoroughly rinse the electrode with distilled water.