Siemens ULTRAMAT 23 Series - Analyzer Status: Diagnostics Values: (Electrochemical) O2 Sensor

81261
SO LED curr.: 700
Z: 1.000 C: 0.000
Alpha_c: +9.5290e-1
Alpha_f: -3.3477e-4
2
Calibration values
Here you can read out various diagnostic values, which have the
following meaning:
• SO
2
: The relevant component
• LED current: The LED amperage in DAW units (maximum
2047, here in the example 700)
• Z: The signal ratio between the measuring channel and ref‐
erence channel (in the example: 1)
• C: Cross-sensitivity: This value maps the proportional cross-
correction of the respective channel (here: SO
2
) onto the
second UV channel (NO
2
).
Note:
In the example, the value of C for the SO
2
component is
0.000, because SO
2
does not cause any cross-sensitivity on
the 2nd channel (NO
2
). For NO
2
the value of C is 0.160, be‐
cause NO
2
causes a cross-sensitivity of about 16% on the SO
2
channel.
• Alpha_c and Alpha_f
These values are linearization parameters that are used to
convert measured intensity values I(C) to concentration val‐
ues C based on the Lambert-Beer absorption law:
I(C) = I(0)[αe + 1 - α]
βc
Alpha_f is the factory setting, Alpha_c is the value which was
last determined after the customer calibration.
81263
Signal strengths SO2
Reading
Meas: 335979e1
Ref.: 416329e1
Optical alignment
This screen shows the signal strengths of the measuring channel
(3rd line) and reference channel (4th line).
8.1.2.3 Analyzer status: Diagnostics values: (Electrochemical) O2 sensor
Sensorsig : 11.11 mV
O2 : 20.77 %
Date: DD.MM.YYYY
Inst.volt.: 12.10 mV

This dialog displays the diagnostics values of the electrochemi‐
cal oxygen sensor (option). Meaning:
• Sensorsig is the current pressure-compensated voltage of
the O
2
sensor in mV
• O
2
is the current oxygen value. Negative values are also pos‐
sible here
• Inst. date is the installation date of the O
2
sensor (see sec‐
tion Calibration: O2 measuring range: Sensor inst. date
(Page 117))
• Inst.volt is the pressure-compensated voltage of the O
2
sen‐
sor when it was installed.
Functions
8.1 Diagnostics
ULTRAMAT 23
108 Equipment Manual, 04/2022, A5E37100388-012