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Description
3.3 Function
Electrochemical hydrogen sulfide measurement
6
1
2
3
Figure 3-7
The hydrogen sulfide (H
and is oxidized on the working electrode (2). The reduction of oxygen in air takes place on the
counter electrode (4) as a counter reaction. The transfer of electrons can be tapped at the
terminal posts (5) as a current that is directly proportional to the gas concentration.
The zero point is automatically recalibrated by the AUTOCAL function when connecting e.g.
nitrogen or air.
Automatic calibration of the IR and UV components with air or nitrogen (AUTOCAL)
Figure 3-8
The ULTRAMAT 23 can be calibrated using, for example, ambient air. During this process (can be
set between 1 and 24 hours, 0 = no AUTOCAL), the analyzer chamber is purged with air by way
of an internal or external 3-way valve. The detector then generates the largest signal U
30
Gas membrane
Working electrode
Reference electrode
Operating principle of H
S) enters the sensor through the diffusion barrier (gas membrane (1))
2
Calibration with air
4 Counter electrode
5 Terminal posts
6 Electrolyte (H
S sensor
2
Equipment Manual, 04/2022, A5E37100388-012
1
2
3
4
5
SO
)
2
4
ULTRAMAT 23
(no pre-
0
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