Dissolved oxygen (D.O.) Multi 9420
70 ba75964e04 04/2015
Air pressure
correction
The integrated air pressure sensor of the Multi 9420 measures the current air
pressure. The air pressure is automatically used for air pressure correction
during calibrating and for the display of the oxygen saturation [%] parameter.
You can view the current air pressure in the sensor menu when an IDS D.O.
sensor is connected. Press the <ENTER> key in the measured value display.
The current air pressure is displayed as an info message.
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.
Irrespective of the setting for automatic Stability control (see section 9.6.3
A
UTOMATIC STABILITY CONTROL, page 96) in the System menu, you can start a
measurement with Stability control manually at any time.
1. Freeze the measured value with <AR>.
The [HOLD] status indicator is displayed.
The HOLD function is active.
You can terminate the Stability control function and the HOLD func-
tion with <AR> or <M> at any time.
2. Using <ENTER>, activate the Stability control function manually.
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.
As soon as a measured value meets the stability criteria, it is frozen. The
[HOLD][AR] status indicator is displayed, the progress bar disappears
and the display of the measured parameter stops flashing.
The current measurement data is output to the interface. Measurement
data meeting the stability control criterion is marked by AR.
You can prematurely terminate the Stability control function manu-
ally with <ENTER> at any time. When the Stability control function
is prematurely terminated, the current measurement data are out-
put to the interface (PC, USB memory device or USB printer) with-
out AutoRead info.
3. Using <ENTER>, start a further measurement with stability control.
or
Release the frozen measured value again with <AR> or <M>.
The [AR] status display disappears. The display switches back to the
previous indication.
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