Xylem HandyLab 100 - Manual (Page 28)

Operation HandyLab 100
28 ba77062d01 03/2014
4.4.3 Measuring the ORP
Note
ORP electrodes are not calibrated. However, you can check ORP elec-
trodes using a test solution.
Stability control
(AutoRead )
The stability control function (AutoRead) continually checks the stability
of the measurement signal. The stability has a considerable impact on
the reproducibility of measured values.
The measured parameter flashes on the display
 as soon as the measured value is outside the stability range
 when the automatic Stability control is switched off.
You can start the Stability control manually at any time, irrespective of
the setting for automatic Stability control (see page 24) in the Measure-
ment menu.
1 Perform the preparatory activities according to section 4.4.1.
2 Submerse the ORP electrode in the sample.
3 Select the mV display with <M>.
U
157.0
mV
24.8 °C
15.03.2014
010:00
Menu
1 Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
The HOLD function is active.
2 Using <ENTER>, activate the Stability control function manu-
ally.
The [AR] status indicator appears while the measured value is
assessed as not stable. A progress bar is displayed and the
display of the measured parameter flashes.
The [HOLD][AR] status indicator appears as soon as a stable
measured value is recognized.