Ph Value; Measuring; Measuring The Ph Value - Xylem SI Analytics Lab 855 Operating Manual

Lab 855
5

pH value

Stability control (AutoRead )
ba77143e02 12/2017
5.1

Measuring

5.1.1

Measuring the pH value

To ensure the high measurement accuracy of the measuring sys-
tem, always measure with A current calibration (see section 5.2
C
ALIBRATION
1. Connect the pH electrode to the meter.
2. When measuring without temperature sensor: Temper the test sample or
measure the current temperature.
3. If necessary, select the measured parameter (pH) with <M>.
4. Immerse the pH electrode in the test sample.
The measured value is checked for stability (stability control).
The [AR] status display flashes.
5. When measuring without temperature sensor: Enter the temperature of
the test sample with <><>.
6. Wait for a stable measured value.
The [AR] display indicator no longer flashes.
During the measuring procedure, the stability control function is automatically
activated.
The stability control function (AutoRead) continually checks the stability of the
measured values in the monitored time interval. The stability has a consider-
able impact on the reproducibility of measured values. The [AR] display indi-
cator flashes until a stable value is measured.
, page 18).
pH
6 9 2
9
2 4 8
pH value
TP
°C
AR
17