Xylem Lab 860 - Manual (Page 30)

Operation Lab 860
30 ba75554e05 01/2010
Note
Here you can cancel the calibration procedure with <MODE>. This
corresponds to a two-point calibration. The value of the zero point
(Asy) is displayed for 10 seconds, then the value of the slope (Slo) is
displayed for 10 seconds. After this the meter switches to the
measuring mode.
Continue with three-
point to five-point
calibration
Note
Here you can cancel the calibration procedure with <MODE>.
The value of the zero point (Asy) is displayed for 10 seconds, then the
value of the slope (Slo) is displayed for 10 seconds. After this the meter
switches to the measuring mode.
The calibration is automatically finished after all buffers of a buffer set
were used.
Note
While the zero point (ASY) is being displayed, you can change the unit
of the zero point with
<
▲><▼>
.
While the slope (SLO) is being displayed, you can change the unit of
the slope with
<
▲><▼>
.
The % display refers to the Nernst slope of 59.2 mV/pH at 25° C (100
x determined slope/Nernst slope).
The unit of zero point and slope can be permanently changed in the
measurement settings (see page 46).
Note
The calibration line is calculated by linear regression.
9 Thoroughly rinse the electrode with distilled water.
10 If necessary, set the temperature of the third buffer solution
with <
▲><▼>.
11 Immerse the pH electrode in the third buffer solution.
12 Press the <OK> key.
The SC display indicator flashes.
Depending on the setting, the display shows the nominal pH
value for the recognized buffer or the electrode voltage (mV).
As soon as a stable value is recognized, the next buffer is
requested.