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pH value pH/ION 7320
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6 pH value
6.1 Measuring
6.1.1 Measuring the pH value
NOTE
When connecting an earthed PC/printer, measurements cannot be
performed in earthed media as the values would be incorrect
.
The USB interface is not galvanically isolated.
Stability control
(AutoRead)
& HOLD function
The stability control function ( AutoRead ) continually checks the stability of the
measurement signal. The stability has a considerable impact on the reproduc-
ibility 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 activate or switch off the automatic Stability control function (see
section 9.3.1 S
YSTEM
, page 75).
To ensure the high measurement accuracy of the measuring sys-
tem, always measure with a calibrated electrode (see section 6.2
C
ALIBRATION
, page 31).
1. Connect the pH electrode to the meter.
2. If necessary, select the measured parameter with <M> .
3. When measuring without temperature sensor:
Temper the test sample or measure the current temperature and enter it
with
<

> <

> .
4. Immerse the pH electrode in the test sample.
The measured value is checked for stability (automatic stability control).
The display of the measured parameter flashes.
5. Wait for a stable measured value.
The display of the measured parameter no longer flashes.
pH
6.949
24.8 °C
12.12.2012
12:12
USB output