wtw pH 7310, Руководство по эксплуатации

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pH value pH 7310
22
ba75929e02 10/2011
5 pH value
5.1 Measuring
5.1.1 Measuring the pH value
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 7.1.1 C
HANGING THE SETTINGS FOR P
H
MEASUREMENTS
, page 38).
To ensure the high measurement accuracy of the measuring sys-
tem, always measure with a calibrated electrode (see section 5.2
C
ALIBRATION
, page 25).
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
01.07.2011
08:00
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USB output