Multi 340i
Oxygen calibration
9
Oxygen calibration
Calibration proce-
dures
The calibration is performed in water vapor-saturated air. Use the
OxiCal
®
-SL air calibration vessel (accessories) for the calibration.
Sensor evaluation
After the calibration, the measuring instrument evaluates the current status
of the sensor against the relative slope. The evaluation appears on the dis-
play. The relative slope has no effect on the measuring accuracy. Low values
indicate that the electrolyte will soon be depleted and the probe will have to
be regenerated.
Oxygen calibration procedure:
Display
Relative slope
S = 0.8 ... 1.25
S = 0.7 ... 0.8
S = 0.6 ... 0.7
E3
Invalid calibration
S < 0.6 or S > 1.25
l
Keep the OxiCal
®
-SL air calibration vessel ready.
l
Connect the D. O. probe to the measuring instrument.
If necessary, press the <M> key repeatedly until the status display O
2
(oxygen measurement) appears.
l
Put the D. O. probe into the air calibration vessel.
l
Press the <CAL> key repeatedly until the oxygen calibration mode ap-
pears (display O
2
CAL).
l
Press <RUN/ENTER>. The AutoRead measurement begins.
l
When the measured value is stable, the instrument displays the value of
the relative slope and the sensor evaluation.
l
Switch to the measuring mode with <M>.
6
7
1
A L
C
O
°
C
TP
Cal
6
7
1
8 8
0
O
°
C
TP
Cal
AR
S
