wtw inoLab 740, Operating Manual

Page: 81 / 274

pH
81
6.2.2 Calibration
Preparatory
activities
Note
During calibration without a temperature probe, set the
current temperature of the respective buffer solution
manually (see section 5.5.1).
If you use a temperature probe, it is not necessary to enter
the temperature manually.
AutoCal
calibration
For the AutoCal procedure, use buffer solutions according to
the buffer table (see section 6.2.1).
During calibration, the display shows both the calibration
procedure and the number of the next buffer solution before
a new buffer solution is used.
The display, e.g.
ct1 here, has the following meaning:
1 Use
m
and/or
46
to display the pH value.
2 Connect the pH electrode to the measuring module.
3 Keep the buffer solutions ready (up to 5 solutions,
depending on the selected calibration procedure).
4 Adjust the temperature of the solutions and measure
the temperature if measurement is made without a
temperature probe.
c: The calibration has been started.
t: Selected buffer dataset
t = Technical buffer or
d = DIN buffer or
m = Merck buffer
Possible values: t, d, m
1: No. of the next buffer solution
1 = 1st buffer solution
2 = 2nd buffer solution
3 = ..., etc.
Possible values: 1 ... 5