34
EL3000
CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. C
… 3 Preparation for Installation
… Housing purge
Initial purging upon commissioning
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
If the purge gas flow is lower than specified, the duration of the
purging must be extended accordingly.
Housing purge during operation
Purge gas flow
At the device input max. 20 l/h (constant)
Purge gas overpressure
p
e
= 2 to 4 hPa
For a purge gas flow rate of 20 l/h at the device inlet, the purge
gas flow rate at the device outlet is approx. 5 to 10 l/h.
Housing purge during operation when measuring
flammable gases
The housing must be purged using nitrogen. Purge gas flow rate
1 to 20 l/h. The purge gas flow must be monitored at the purge
gas output.
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.
