wtw inoLab 740, Operating Manual

Page: 98 / 274

Ion concentration
98
7.2.3 Reference measurement ( Ref Meas )
A reference measurement enables you to assign the voltage
value 0 mV to the calibration curve of your electrode for a
specific ion concentration (reference concentration).
Prerequisite:
l
The measured value display must show the voltage.
l A valid calibration must be available.
1 Switch to the Display mode.
2 Only if no valid calibration is available
(no sensor symbol on the measured value display):
Perform a calibration (see section 7.3).
3 Switch to the display of the voltage ( U ) with
m
.
4 Switch to the Menu mode.
5 Use
46
to select the main Meas menu.
6 Select the ISE menu item with
82
.
7 Confirm the ISE menu item with
g
.
8 Select the ISE setup menu item with
82
.
9 Confirm the ISE setup menu item with
g
.
10 Select the Ref Mess menu item with
82
.
11 Confirm the Ref Meas menu item with
g
.
The Ref Mess function is active (
✔
).
The
-
symbol flashes on the measured value
display.
12 Switch to the measured value display with
m
.
13 Open the input field for temperature and reference
concentration with
82
.