wtw Oxi 170, Operating Instructions Manual

Page: 39 / 64

Oxi 170 Operation
101 ba24105e08 11/2010
Calibration routine
1 In the measured value display:
Call up the calibration routine with
<C> . The
CAL
display appears.
Note: The states of all relays and
current outputs linked with the
measured oxygen value are frozen
during the calibration routine (
CAL
display).
2 Put the sensor into the calibrating
position. To do this, position the
sensor approx. 2 cm above a water
surface, the best is a narrow
mouthed bucket or similar vessel.
No drops of liquid should get onto
the membrane while doing so.
3 Start the calibration with
<ENTER> . The sensor slope is
determined. The measurement
runs until a stable value is reached
(AR flashes).
4 If the value is stable, AR goes out.
The slope is accepted.
Note: A flashing slope value
indicates that the slope is close to
the edge of the permissible range
(slope < 0.5 or > 1.4). In this case
replace the electrolyte and
membrane head in the near future.
5 Put the sensor back into the
measuring position.
6 Press <ENTER> .
The measured value is displayed
in the second line.
The states of all relays and current
outputs linked with the measured
oxygen value remain frozen.
% mg/ l
AR
REL2 REL1
Sal
°
C
Ident
Baud 8 8 8 8
Sal
O
1
S
C A L
Cal
Auto
Oxi
% mg/ l
REL2 REL1
Sal
°
C
Ident
Baud 8
Sal
O
1 C A L
Cal
Auto
Oxi
0 8 9
S
AR
AR
% mg/ l
REL2 REL1
Sal
°
C
Ident
Baud 8
Sal
O
1 C A L
Cal
Auto
Oxi
0 8 9
S
Cal
Auto
Oxi
S
AR
%
REL2 REL1
Sal
°
C
Ident
Baud 8
Sal
O
1 C A L
mg/ l
1 8 5