wtw inoLab 740, Operating Manual

Page: 105 / 274

Ion concentration
105
7.3.1 Two-point and three-point calibration
Two-point
calibration
1 Perform the preparatory activities.
2 Switch to the ISE display with
m
and/or
46
.
3 Press the
c
key. A field to select the concentration
of the first standard solution is displayed.
4 Use
82
to enter the concentration of the first
standard solution.
5 Immerse the electrode in standard solution 1.
6 Press the
g
key.
The electrode voltage is displayed and the
h
display indicator flashes.
7 As soon as a stable value is reached,
h
stops
flashing and the field to input the concentration of the
second standard solution appears.