ABB EasyLine Series - ZO23: Preparation for Installation

Preparation for Installation 25
ZO23: Preparation for Installation
Sample gas
ATTENTION
The gas analyzer may not be used for the measurement of ignitable
gas/air or gas/oxygen mixtures.
Sample Gas Inlet Conditions
Temperature +5…+50 °C
Inlet pressure
p
e
 70 hPa
Flow 4…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 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 affect 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.
Note: Sample gas temperature, pressure and flow rate should be
maintained constant to such a degree that the fluctuation influence on the
accuracy of measurement is acceptable (see also Chapter "Analyzer
Module Operating 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
stoichiometric 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.