A-3-2 Appendix 3: ZO23 Trace Oxygen Analyzer Module 42/24-10 EN Rev. 9
Requirements at the Installation Site
Ambient Temperature +5 to +45 °C with installation in a system housing with an electronics module
Heat Sources and
Magnetic Fields
No heat sources or instruments which generate strong magnetic fields (e.g. elec-
tric motors or transformers) may be located in the proximity of the installation site.
Sample Gas Inlet Conditions
Temperature: +5 to +50 °C Conditions at the
Sample Gas Inlet of
the Gas Analyzer
Pressure: 2 to 20 hPa positive pressure
Sample Gas
Flow Rate
5 to 10 l/h. The flow rate must be kept constant to ±0.2 l/h in this range. The flow
rate is kept constant to 8 ± 0.2 l/h with integrated pump and flow control. The
sample gas must be taken from a bypass at zero pressure.
If the sample gas flow rate is too low, contaminants from the gas lines (leaks,
permeability, desorption) will adversely affect the measuring result.
If the sample gas flow rate is too high, asymmetrical cooling of the sensor may
cause measuring errors. This can also cause faster aging or damage to the
measuring cell.
Flammable and
Corrosive Gases
The analyzer must not be used for measurement of ignitable gas/air or gas/oxygen
mixtures. The concentration of flammable gases in the sample gas must not
exceed 100 ppm.
The presence of corrosive gases and catalyst poisons, e.g. halogens, sulfurous
gases and heavy-metal dusts, results in faster aging and/or the destruction of the
measuring cell.
Associated Gas
Effect
Inert gases (Ar, CO
2
, N
2
) have no effect. Flammable gases (CO, H
2
, CH
4
) in
stoichiometric concentrations to the oxygen content: Conversion of O
2
< 20 % of
the stoichiometric conversion. If higher concentrations of flammable gases are
present, higher O
2
conversions must be expected.
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