28 EL3000 CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. B
ZO23: Preparation for installation
Sample gas
CAUTION
The gas analyzer may not be used for the measurement of ignitable
gas/air or gas/oxygen mixtures.
Sample gas inlet conditions
Temperature +5 to +50 °C
Inlet pressure p
e
≤ 70 hPa
Flow 4 to 20 l/h
The sample gas flow rate must be kept constant at ±0.2 l/h in the specified
range. The sample gas must be taken from a bypass at zero pressure. If the
sample gas flow rate is too low, the effects of contaminants from the gas
lines (leaks, permeabilities, desorptions) have an adverse effect on the
measurement result. If the sample gas flow rate is too high, asymmetrical
cooling of the sensor can cause measuring errors. This can also cause faster
aging of or damage to the sample cell.
Remark: Sample gas temperature, pressure and flow rate should be main-
tained constant to such a degree that the fluctuation influence on the accu-
racy of measurement is acceptable (see also Chapter "Analyzer module oper-
ating data").
Corrosive gases
The presence of corrosive gases and catalyst poisons, e.g. halogens, gases
containing sulphur and heavy metal dusts, causes faster aging and/or or
destruction of the ZrO
2
cell.
Flammable gases
The analyzer module is suitable for the measurement of flammable gases in
a non-hazardous environment. The concentration of flammable gases in the
sample gas may not exceed 100 ppm.
Associated gas effect
Inert gases (Ar, N
2
) have no effect. Flammable gases (CO, H
2
, CH
4
) in stoi-
chiometric concentrations for the oxygen content: Conversion of O
2
< 20 %
of the stoichiometric conversion. If there are higher concentrations of
flammable gas, higher O
2
conversion rates must be expected.
Sample gas outlet conditions
The outlet pressure must be the same as the atmospheric pressure.
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