Purge Sample Gas Path And Analyzer Housing; Gas Analyzer Start-Up - ABB EasyLine EL3000 Manual

100 EL3000 CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. C
... 6 Commissioning
Purge sample gas path and analyzer
housing
Before the gas analyzer is commissioned and the sample gas is
connected, the sample gas path and, if necessary, the wall
housing must be purged.
First of all, this makes sure that before commissioning, the
sample gas paths and wall-mounted housing are free from
contaminants, e.g. corrosive gases and accumulations of dust.
Secondly, this prevents any explosive gas / air mixture present in
the sample gas paths or wall-mounted housing from being
ignited when the power supply is powered-up.
Initial purging upon commissioning
Pre-purging the gas path
Purge gas Nitrogen
Purge gas flow Maximum 100 l/h
Purge time approx. 20 s
Housing purge*
Purge gas Nitrogen
Purge gas flow Maximum 200 l/h
Purge time Approx. 1 hour
* Not for Fidas24, see for a separate description at Housing purge with
Fidas24 on page 34.
If the purge gas flow is lower than specified, the duration of the
purging must be extended accordingly.
Housing purge with Fidas24
In the Fidas24 gas analyzer, the housing purge is provided in
such a way that a part (approx. 600 to 700 l/h) of the instrument
air is conducted continuously through the housing as purge air.
Thus it is guaranteed that no ignitable gas mixture can form
within the housing in case of a leak in the combustion gas path.
The housing purge is always active when pressurized air is on,
that is also when the instrument air valve is closed.

Gas analyzer start-up

Note
For the analyzers ZO23 and Fidas24, the instructions specified in
ZO23 – Commissioning the gas analyzer on page 101 or
Fidas24 – Commissioning the gas analyzer on page 101 must be
observed.
General description of commissioning
1. Turn on the gas analyzer power supply.
2. During the start-up phase ('Booting'), the LCD display shows
the name of the gas analyzer and the number of the software
version.
3. At the end of the start-up phase, the LCD display switches
over to display the measured values.
Example:
4. Check the gas analyzer configuration and change if
necessary, see Operating instruction.
5. Once the warm-up phase is complete, the gas analyzer is
ready to begin the measurement process, see Duration of
the Warm-up Phase on page 100.
6. Check the gas analyzer calibration, see Operating instruction.
The gas analyzer is factory calibrated. However, transport
influences as well as the pressure and temperature
conditions at the installation site can influence the
calibration.
7. Turn on the sample gas supply.
Duration of the Warm-up Phase
Analyzer Duration of the Warm-up Phase
Uras26 Without thermostat: approx. ½ h
With thermostat: approx. 2 h
Limas23 Approx. 2 hours
Magnos206 < 1 hours
Magnos28 < 5 h, The value may be elevated during first
commissioning or after a longer service life.
Magnos27 2 to 4 h
Caldos27 Approx. ½ h
Fidas24 Approx. 2 hours
ZO23 approx. 2 h, see for detailed information ZO23 –
Commissioning the gas analyzer on page 101.