wtw Oxi 1970i Operating Manual page 22

Calibration procedure
pH S mV /
C A L
1
O % mg/l
S/
m
Sal
1/ cm
Time Baud 1 1 7 6
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
pH S mV /
1 0 8 8
% mg/l
O
S/
m
Sal
1/ cm
Time Baud 1 1 7 6
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
pH S mV
1 F A C
O % mg/l
S/
m
Sal
1/ cm
Time Baud 1 1 7 6
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng
pH S mV
1 4 4 2
% mg/l
O
S/
m
Sal
1/
cm
Time Baud 1 0 0 7
C
°
Day.Month No.
%
Year Ident
Tref25 Tref20 Auto Store REL1
LoBat nLF Lin Oxi Cal TEC ARng AR
22
Procedure for calibrating with the air calibration vessel OxiCal®-SL:
 Keep the OxiCal
 Connect the D. O. sensor to the measuring instrument.
 Put the D. O. sensor into the air calibration vessel.
 Press the <CAL> key repeatedly until O
pH
cm
Sal
/
K
TP
REL2
RCL
 Press <RUN/ENTER>. The AutoRead measurement begins.
The value of the relative slope of the sensor is displayed.
 As soon as the measured value is stable, the instrument displays the
pH
sensor evaluation.
cm
 Switch to the measuring mode with <M>.
Sal
/ K
TP
REL2
RCL
Procedure for calibrating via a comparison measurement:
 Connect the D. O. sensor to the measuring instrument.
 Press the <CAL> key repeatedly until O
/ pH
 Immerse the oxygen sensor in the calibrating solution.
cm
Sal
/
K
TP
REL2
AR RCL
 Press <RUN/ENTER>. The AutoRead measurement begins.
 If the measured value is stable, the instrument displays the determined
/ pH
measured value and the correction factor of the relative slope (initial
cm
value = 1.000).
Sal
 Remove the oxygen sensor from the calibrating solution.
/ K
TP
REL2
 Perform a comparison measurement (determine the nominal value).
RCL
Leave the measuring instrument switched on until the nominal value is
determined.
 Set the displayed value on the measuring instrument to the nominal
value with <▲> <▼>. This changes the related correction factor of the
relative slope.
 Switch to the measuring mode with <M>.
Note
®
-SL air calibration vessel ready.
CAL appears.
2
FAC appears.
2
ba75676e03
Oxi 1970i
05/2012