Conventional Calibration (Concal) - wtw pH 3110 Operating Manual

Operation
Single-point calibration
Two-point calibration
24
12 Press the <ENTER> key.
The AR display indicator flashes.
The electrode voltage (mV) or the nominal value of the buffer
(setting: see section 4.5.2) is displayed. The asymmetry is
displayed as soon as a stable value is recognized.
13 Press the <ENTER> key.
The value of the slope (mV/pH) appears on the display.
14 To return to the measuring mode: Press the <ENTER> key.
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 also be changed permanently in
the measurement settings (see section 4.5.2).

4.3.3 Conventional calibration (ConCal)

Use any buffer solution for this rapid method.
The calibration will be the more exact the nearer the pH value of the
buffer solution is to that of the test sample.
Use two buffer solutions for this procedure:
pH 7.0 ± 0.5
any other buffer solution
Note
The steps 2 and 9 are not necessary if you use a pH combination
electrode with a temperature sensor.
1 Press the <CAL> key repeatedly until the ASY display indicator
and the ConCal function indicator appear.
pH 3110
ba75791e02 11/2008