wtw pH 3300i Operating Manual page 24

Operation
Three-point
calibration
24
12 Press the <RUN/ENTER> key
to continue the three-point calibration.
Ct3 appears on the display.
13 Thoroughly rinse the electrode with distilled water.
14 If necessary, enter the temperature of the third buffer solution with
<▲> <▼>.
15 Immerse the pH electrode in the third buffer solution.
16 Press the <RUN/ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the buffer nominal value appears on
the display.
When the measured value is stable, AR disappears.
The instrument displays the value of the slope (mV/pH) and the eval-
uation of the calibration in calibration range II.
17 Press the <RUN/ENTER> key.
The instrument displays the value of the asymmetry in calibration
range II. The three-point calibration is completed.
18 To return to the measuring mode: Press the <M> key.
Note
You can prematurely terminate the three-point calibration by pressing <M>.
The values of the two-point calibration for slope and asymmetry will then re-
main stored.
pH 3300i/3400i
ba75682e02 03/2008