Xylem CG 842 - Manual (Page 32)

Operation
75
Single-point
calibration
Use a buffer solution in the range pH = 7.0 ± 0.5 for this pro-
cedure.
Note
Only the electrode asymmetry is determined in single-point
calibration. The slope of the last two-point calibration is re-
tained.
Note
Step 2 is not required if you use a temperature probe. The
TP display indicates an active temperature measurement.
1 Press the key repeatedly until ASY and the
ConCal function display appear.
2 Set the temperature of the buffer solution by pressing
< ▲ > < ▼ >.
3 Submerse the pH electrode in the buffer solution.
4 Press the key.
The measured pH value appears on the display.
5 Set the nominal pH value of the buffer solution (at the
current temperature) by pressing the < ▲ > < ▼ > keys.
6 Press the key.
The value of the asymmetry (mV) and the sensor
symbol for the evaluation of the electrode appears on
the display.
7 To return to the measuring mode: Press the
key.