Xylem Oxi 1970i PORTABLE DISSOLVED OXYGEN METERS - Manual (Page 25)

Oxi 1970i Operation
25 ba75691e01 01/2007
4.3.2 Calibrating via a comparison measurement
Proceed as follows to calibrate the instrument:
1 Connect the D. O. sensor to the measuring instrument.
2 Press the <CAL> key repeatedly until O
2
FAC appears.
3 Immerse the D. O. sensor in the calibrating solution.
4 Press the <RUN/ENTER> key.
The AutoRead measurement begins. If the measured value is
stable, the instrument displays the determined measured value
and the correction factor of the relative slope (initial value =
1.000).
5 Remove the D. O. sensor from the calibrating solution.
6 Perform a comparison measurement, e. g. Winkler titration,
with the calibrating solution (determine the nominal value).
Leave the measuring instrument switched on until the nominal
value is determined.
7 Set the displayed value on the measuring instrument to the
nominal value with <
▲> <▼>. This changes the related correc-
tion factor of the relative slope.
REL1
S
AR
Year Ident
No. Day.Month
Tref25 Tref20
LoBat Lin nLF
mg/ l
ARng
Sal
pH
1
TEC
Auto Store
8
Time Baud Sal cm 1/
K / %
RCL
REL2
pH / mV
m cm S/
%
F
1 7 6
A C
°
C
TP
O
Oxi Cal
TP
REL1
S
Year Ident
No. Day.Month
Tref25 Tref20
LoBat Lin nLF
Sal
pH
1
TEC
Auto Store
Time Baud Sal cm 1/
K / %
RCL
REL2
pH / mV
m cm S/
%
4
0 0 0
4 2
°
C
O
1
AR ARng Oxi Cal
mg/ l