Siemens 7MB2335, Operating Instructions Manual, Page: 73 / 168

Operation
5-23
Operating instructions ULTRAMAT 23 gas analyzer
C79000-B5276-C216-03
5.8.2.2 Calibration: Calibrate O
2
Sensor: O
2
Zero Cal.
In this dialog you can recalibrate the zero point of the O
2
sensor using
nitrogen. Connect a flow of nitrogen and commence the calibration
using
ENTER .
When you call the calibration function, the current oxygen value is
displayed in the second line. If this does not deviate by more than 1 %
from the set value, it is used as the new zero (this is not the case in the
example display, see third line).
If the value is greater than 1 %, a fixed standard value is used instead.
Notice
Please note that the exchange of gas takes place very slowly with low
oxygen concentrations. Purge for 30 min, and then use the current
value.
5.8.3 Calibration: Calibrate Pressure Sensor
In the first line of this dialog, you can re-enter the setpoint of the
pressure sensor. Measure a value e.g. using an accurate barometer,
and change the setpoint in the first line if necessary.
O
2
zero ca. with N2
0.18 %
Nitrogen flow please
Calibrate with ENTER
5822
O
2
zero cal with N2
1.25 %
>1% => default value
Press ESC to return
5822a
Set value: 1000 mbar
Reading: 1007 mbar
Enter new set value
583