Measuring The Ph Value; Autoread Ar (Drift Control) - wtw inoLab pH/Oxi Level 1 Operating Manual

Operation
82

4.2.1 Measuring the pH value

1 Perform the preparatory activities according to
section 4.2.
2 Immerse the pH electrode into the test sample.
u
3 Press the
display. The pH value appears on the display.

4.2.2 AutoRead AR (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 values.
For identical measurement conditions, the following criterion
applies:
l pH value: better than 0.02 (response time: > 30 s)
1 Call up the pH measuring mode by pressing
2 Immerse the pH electrode into the test sample.
3 Activate the AutoRead function by pressing
The current measured value is frozen (Hold function).
4 Start the AutoRead function by pressing
AR flashes on the display until a stable measured
value is reached.
5 If necessary, start the next AutoRead measurement
by pressing
6 To terminate the AutoRead function: Press
d
or key until pH appears in the status
g
.
u d
.
a
.
g
.
a
.