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

Functions
8.2 Calibration
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
115
8.2.3.2
Calibration: O2 measuring range: Calibrating the O2 zero point
You can use this function to re
-adjust the zero point of the H
2
S
sensor with nitrogen. Connect nitrogen to the
sensor and
commence the calibration with <ENTER
>.
Following calling of the correction function, the current oxygen
value is displayed in the second line. If the
displayed value
does not deviate by more than 1% from the set value, it is used
as the new zero point.
If the deviation is greater than 1% (as is the case in the exa
m-
ple on the left, see third line), a fixed default value is used i
n-
stead.
Note
The ga
s exchange takes place very slowly with low oxygen concentrations. In such cases we
recommend flow periods of approx. 30 minutes before you use the current value.
8.2.3.3
Calibration: O2 measuring range: Calibrate measuring range
You can calibrate the sensitivity of the electrochemical O
2
sensor using this function.
The adjacent menu display appears when you select the fun
c-
tion.
Start the calibration procedure by posi
tioning the cursor to the
3rd line and pressing the <ENTER
> key.
The analyzer interrupts the current measurement when the
calibration procedure is selected and e
xpects a flow of calibra-
tion gas.
The entered setpoint is displayed in the first line and the act
u-
ally measured value in the second line.
If the analyzer recogni
zes a flow of calibration gas, the display
changes as shown. If the measured value in the second line
remains constant for more than approx. 10
s or does not
change significantly, press the <ENTER
> key.