H84.0.15.6C-01
Operating manual ResOx 5695
Page 13 of 22
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9
Calibration of the oxygen sensor
In order to compensate for ageing of the sensor, the sensor has to be calibrated at regular
intervals.
The device is equipped with an easy-to-use calibration function.
We recommend to calibrate the sensor at least all 7 days, or to get maximum precision,
before each measuring series.
9.1 One point calibration
“
(AL.
1-PT
“
The calibration adjusts the sensor to the oxygen content of the atmosphere (20.95 % Vol. O
2
) Therefore
simply expose the sensor to the ambient air (sufficient ventilation in closed rooms has to be ensured).
Start calibration: press
for 2 seconds.
The display will show
A,R
, and as soon the values for oxygen and temperature are stable, the
calibration will be finished.
Then the sensor state resulting of the successful calibration will be shown for a short time evaluation in 10%
steps
”
xx%
ELE[
“
.
9.2 2 / 3- Point calibration
”
(AL
2-PT
“
,
”
(AL
3-PT
“
The sensor will be automatically calibrated to the oxygen content of the atmosphere (20.95 % Vol. O
2
), and
one or two additional concentrations. As reference, gases usually Nitrogen (0 % Vol. O
2
) or pure oxygen are
used (100 % Vol. O
2
).
1. Start calibration: press:
- key for 2 seconds.
2. First calibration reference: (Pt.1)
As first reference at a 3-point calibration, the zero reference has to be applied 0 % VOL O
2
.
at a 2-point calibration either 100 % Vol. O
2
or 0 % Vol. O
2.
The display will show
, and the referring reference which should be applied.
-
0.2
for pure oxygen.
-
NULL
for 0% oxygen (e. g. pure nitrogen).
As long as the display blinks, the instrument recognises no valid reference.
As soon the values for oxygen and temperature are stable, the calibration of the first point will be finished
.
The instrument tells you to apply the next reference (possible references are blinking in the display).
3. Second calibration reference: (Pt.2)
The display will show
, and the referring reference which should be applied.
-
A,R
for ambient air.
-
0.2
for pure oxygen.
-
NULL
for 0 % oxygen. (e. g. pure nitrogen).
As long as the display blinks, no valid reference is recognised by the instrument.
As soon the values for oxygen and temperature are stable, the calibration of the second point will be
finished. At 2-point calibration the calibration will be finished and the sensor state resulting of the successful
calibration will be shown for a short time evaluation in 10% steps
”
xx%
ELE[
“
.
At 3-point calibration, the instrument tells you to apply the next reference (possible reference is blinking).
1. Third calibration reference: (Pt.3)
The display will show
, and the referring reference which should be applied:
As soon the values for oxygen and temperature are stable, the calibration of the second point will be
finished. At 2-point calibration the calibration will be finished and the sensor state resulting of the successful
calibration will be shown for a short time evaluation in 10% steps
”
xx%
ELE[
“
.
In case of error messages being displayed during the calibration process, please refer to
our notes at the end of this manual! If a calibration cannot be carried out after an extended
period of time, at least one of the measuring values is unstable (oxygen partial pressure,
temperature).
Please check your measuring arrangements!