Multi 9420
pH value
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04/2015
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4
pH value
4.1
Measuring
4.1.1 Measuring the pH value
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 start the
Stability control
manually at any time, irrespective of the set-
ting for automatic
Stability control
(see section 9.6.3 A
, page 96) in the
System
menu.
The sensor connection and the USB-B (device) interface are gal-
vanically isolated. This facilitates interference-free measurements
also in the following cases:
Measurement in grounded test samples
Measurement with several sensors connected to one Multi 9420
in one test sample
1.
Connect the IDS pH sensor to the meter.
The pH measuring window is displayed.
2.
If necessary, select the measured parameter with
<M>
.
3.
Adjust the temperature of the solutions and measure the current tem-
perature if the measurement is made without a temperature sensor.
4.
If necessary, calibrate or check the IDS pH sensor.
5.
Immerse the IDS pH sensor in the test sample.
01.08.2013 08:00
Info
1.
Freeze the measured value with
<AR>
.
The [HOLD] status indicator is displayed.
The HOLD function is active.
