EL3000 CONTINUOUS GAS ANALYZERS | CI/EL3000-EN REV. B 39
Housing purge
Housing design
Remark: Housing purge in the Fidas24 is described in a separate section, see
below.
Housing Purge is only possible with the wall-mount housing (EL3040 model).
The purging gas connectors (⅛-NPT female thread) are factory-installed
based on orders.
When does a housing purge become necessary?
Housing purge becomes necessary when the sample gas contains flamma-
ble (see page 43), corrosive or toxic components.
Purge gas
The following is to be used as purge gas:
Nitrogen for measuring flammable gases and
nitrogen or instrument air for measuring corrosive or toxic gases
(Quality of instrument air in conformity with ISO 8573-1 Category 3,
i.e. particle size max. 40 µm, oil content max. 1 mg/m
3
, dew point
max. +3 °C).
NOTE
For Uras26, the purging gas must not contain any constituents of the sam-
ple components! Sample component constituents in the purging gas can
falsify the measurement result.
CAUTION
Leaks may cause the purging gas to escape from the housing. When ap-
plying nitrogen as purge gas, appropriate precautionary measures must
be taken against asphyxiation!
The purge gas flow must always be restricted upstream of the purge gas
inlet! If the purge gas flow is not restricted until after the purge gas out-
let, the full pressure of the purge gas is exerted on the seals. This can de-
stroy the operator panel keypad!
Initial purging for start-up
Purging of the gas feed path: Purge gas flow max. 100 l/h,
duration approx. 20 s
Purging of the wall-mount housing: Purge gas flow max. 200 l/h,
duration approx. 1 h
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: max. 20 l/h (constant) at the instrument inlet
Positive pressure of
purging gas:
p
e
= 2 to 4 hPa
With a purge gas flow of 20 l/h at the instrument inlet, the purge gas flow at
the instrument outlet due to leakage will amount to approx. 5 to 10 l/h.
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