Measuring - wtw Multi 340i Operating Manual

Measuring

Connect or
disconnect
the D. O. probe
Oxygen
saturation
AutoRead
(drift control)
Temperature mea-
surement during
pH measurements
AutoRange mea-
suring range
selection
Salt content
correction in
O measurements
2
Reference
temperature of the
conductivity, Tref
6
Measuring
Overview of the measuring modes:
or <M>
concentration
%
Special functions:
The AutoRead function checks the stability of the measurement signal (ex-
cept for the measurement of the ORP voltage). Activate AutoRead with
<AR>. Press <RUN/ENTER> to start the AutoRead measurement. During
the AutoRead measurement, AR flashes on the display until a stable mea-
sured value is reached. This can be terminated at any time taking over the
current measured value with <RUN/ENTER>.
You can perform pH measurements with or without a temperature sensor as
well as with the temperature sensor of an oxygen sensor or a conductivity
measuring cell. The measuring instrument recognizes which sensors are
connected and switches automatically to the correct mode for the tempera-
ture measurement (display TP).
Manual temperature input: Set the temperature value with < > < > while
pressing the <RUN/ENTER> key.
There are several measuring ranges available for both oxygen and conduc-
tivity measurements. If a measuring range is exceeded, AutoRange causes
the measuring instrument to change automatically to the next measuring
range.
A salt content correction is required in the oxygen concentration measure-
ment of samples with a salt content of more than 1 g/l. To do so, press the
<CAL> key repeatedly until Sal appears on the display. Then, enter the salt
content with < > < >. Switch on the salt content correction with < > while
pressing the <RUN/ENTER> key (display SAL). To switch it off, press < >
while pressing the <RUN/ENTER> key.
The reference temperature can be switched between 20 °C and 25 °C. It ap-
pears on the display as Tref20 or Tref25. To switchover the reference tem-
perature, see C
pH value
Oxygen
mg/l
Exchange probe
.
ONFIGURING
Redox-
voltage
mV
Connect or disconnect
the conductivity
or
<M>
measuring cell
Salinity
Sal
Multi 340i
Conductivity
µS/cm