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Manual
GA-21Plus
Warning:
Certain conditions, such as strong electro-magnetic fields can
cause the analyser to become "hung-up". The only solution to this
problem is to switch the instrument off. It is, however, possible
that the analyser will no longer react to the keyboard and can not
be switched off.
Info:
Pressing the [OFF] key for a period of about three seconds will always
switch the analyser off.
3. GENERAL INFORMATION
The
GA-21
plus
is a multi-functional flue gas analyser. Electrochemical sensors
are used for the measurement of gas concentration. The instrument can be fitted with
between 2 and 4 of these sensors. All analysers are fitted with O2 and CO sensors, fur-
ther gas cells must be chosen when the instrument is ordered.
The following description is based on an analyser containing 3 cells, the third one
being an NO sensor.
Oxygen, O2
Carbon monoxide CO
Nitric oxide NO
Carbon dioxide CO2
Nitrogen oxides NOx
The first three gases (O2, CO, NO) are measured directly using the electrochem-
ical cells. The remaining components are calculated. The concentrations of oxygen and
carbon dioxide are shown in percent. The concentrations of the remaining gases are
shown as follows:
volume concentration in [ppm]
absolute mass concentration in [mg/m3]
mass concentration relative to the oxygen content in [mg/m3]
In addition, the air inlet or ambient temperature and flue gas temperature are
measured. Using the measured temperatures, gas concentrations and the known fuel
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