wtw inoLab 740, Operating Manual

Page: 113 / 274

Ion concentration
113
Measuring
the concentration
Measure the concentration as follows:
AutoRead
(drift control)
The AutoRead function (drift control) checks the stability of
the measurement signal. The stability has a considerable
effect on the reproducibility of the measured value. The pH/
ION measuring module allows a setting of the AutoRead
criterion (see section 7.2.4).
Note
Before accepting a measured value, make sure that it is
stable for a longer period of time.
1 Perform the preparatory activities according to
section 7.4
2 Immerse the electrode in the test sample.
3 Press the
m
key until ISE appears. The
concentration value appears on the display.
1 Call up the ISE measuring mode with
m
.
2 Immerse the electrode in the test sample.
3 Activate the AutoRead function with
a
.
The current measured value is frozen.
4 Start AutoRead with
g
.
h
flashes until a stable
measured value is reached. The stable measured
value is transmitted to the printer or interface.
5 If necessary, start the next AutoRead measurement
with
g
.
6 To terminate the AutoRead function: Press the
a
key.