Siemens ULTRAMAT 23 - Calibration: O2 Paramagnetic: Calibrating the Zero Point; Calibration: O2 Paramagnetic: Calibrating the Measuring Range

Functions
8.2 Calibration
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
117
8.2.4.1
Calibration: O2 paramagnetic: Calibrating the zero point
You can calibrate the zero point of the paramagnetic oxygen sensor using this function. You
must use nitrogen as the zero gas.
If the adjacent display appears, start the flow
of nitrogen and
wait until the displayed value has stabilized. Subsequently
begin the calibration by pressing the <ENTER
> key.
Calibration of the zero point must be carried out regularly to guarantee the accuracy of the
paramagnetic oxygen sensor. Information on the achievable accuracy and the calibration
cycles can be found in section Technical specifications (Page 31).
8.2.4.2
Calibration: O2 paramagnetic: Calibrating the measuring range
You can calibrate the sensitivity of the paramagnetic oxygen sensor and set the setpoint
using this function.
Calibrating the sensitivity
If the adjacent display appears, perform the full
-scale calibra-
tion as follows:
1.
Connect the sample gas inlet to the calibration gas
2.
Inject calibration gas with a flow rate of 1 ... 1.2 l/min
3.
Position the cursor at the beginning of the 3rd line (Start
calibration) and press the <
ENTER
> key.
Once the intended flow rate has been reached, the
message 'Correction with ENTER' appears in the 4th line of
the display.
4.
Wait until the displayed measured value has stabilized.
5.
Start the calibration by pressing the <
ENTER>
key.
6.
To exit the menu, press the <
ESC
> key.
The measuring range of the paramagnetic oxygen sensor is calibrated as standard with
ambient air during each AUTOCAL. However, individual calibration with a freely selectable
setpoint between 2% and 100% O
2
is also possible.
Note
If an individual calibration has been carried out using calibration gas, the next AUTOCAL
overwrites this calibration. The AUTO
CAL must be deactivated if this is not required. To do
this:
1.
Navigate to the input menu (823) and
2.
set the "Autocal O2 sens." parameter there to the value 'NO'.