wtw inoLab 740, Operating Manual

Page: 82 / 274

pH
82
The following example covers the autocalibration procedure
using WTW technical buffer solutions. If you use other buffer
solutions, e. g. DIN buffers or buffer solutions of the Merck
company, the displays before using the next buffer will be
different.
Note
During calibration, always use the pH buffer solutions in
ascending order.
1 Select the AutoCal calibration procedure (see
section 6.2.1).
2 Select the buffer data record (see section 6.2.1).
3 Perform the preparatory activities (see section 6.2.2).
4 Start the calibration procedure with
c
.
ct1 appears on the display.
5 If necessary, set the temperature of the first buffer
solution with
82
(see section 5.5.2).
6 Immerse the electrode and the temperature probe in
the first buffer solution.
7 Start the measurement with
g
.
The
h
display indicator flashes.
The electrode voltage (U in mV) appears on the
display. As soon as a stable value is reached, the
display
h
no longer flashes. ct2 appears on the
display.