pH value
Multi 9420
28
ba75964e04
04/2015
Criteria for a stable
measured value
The
Stability control
function checks whether the measured values are stable
within the monitored time interval.
The minimum duration until a measured value is assessed as stable is the
monitored time interval. The actual duration is mostly longer.
4.1.2 Measuring the temperature
For reproducible pH measurements, it is essential to measure the temperature
of the test sample.
IDS sensors measure the temperature with a temperature sensor integrated in
the IDS sensor.
When operating a sensor without integrated temperature sensor, e.g.
via an IDS pH adapter, you have to measure and enter the temperature of the
test sample first.
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 mea-
sured 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 pre-
vious indication.
Measured
parameter
Time interval
Stability in the time interval
pH value
15 seconds
∆
: Better than 0.01 pH
Temperature
15 seconds
∆
: Better than 0.5 °C
