Measuring The D. O. Concentration - wtw pH/Oxi 340i Operating Manual

Operation
Temperature sensor
Switching on/off salt
content correction
34
The D. O. probe has an integrated temperature sensor that always
measures the current temperature of the test sample.

4.4.2 Measuring the D. O. concentration

When measuring the concentration of test samples with a salt content
of more than 1 g/l, a salinity correction is required.
Note
How to enter the current salt content is described in
section 4.4.6 E
NTERING THE SALT CONTENT
Switching the salt content correction on or off, see below.
To measure the D. O. concentration with and without salt content cor-
rection, proceed as follows:
1 Perform the preparatory activities according to section 4.4.1.
2 Immerse the D. O. probe in the test sample.
3 Press the < > < > key repeatedly until the D. O. concentra-
tion in mg/l appears on the display.
TDS UpH O
S
1 7 9 2
Baud
Time
8 1 7
Day.Month No.
Year Ident
Tref25 Tref20 AutoCal DIN
LoBat nLF Lin Cal AutoCal TEC
Proceed as follows to switch on the salt content correction:
1 Perform the preparatory activities according to section 4.4.1.
2 While pressing the <RUN/ENTER> key, switch on the salt con-
tent correction with < > . The SAL display indicator appears
on the display. The specified salt content is taken into consid-
eration during the measurement.
Sal
mV/pH
%
mg/l
m S/
cm
mbar M cm
1/ cm Sal
6
°
C
/
%
K
TP
° F
Auto Store
ARng
AR RCL
pH/Oxi 340i
( ) on page 40.
SALINITY