EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A 27
Case purging
Use
The cases of the control unit and the analyzer unit Uras26 can be purged as
an option for protection of the gas analyzers in a corrosive environment or
with corrosive sample or associated gases.
Purge gas
Clean instrument air from non-hazardous areas or nitrogen is to be used as a
purge gas. The purge gas for purging the EL3060-Uras26 analyzer unit may
not contain any fractions of the sample components.
CAUTION
Leaks may cause the purging gas to escape from the case. When applying
nitrogen as purging gas, appropriate precautionary measures must be
taken against asphyxiation!
Operating statuses of the case purging
Two operating statuses of the purging are permissible to maintain the at-
mospheric conditions in the flameproof case:
• Restriction of the purge gas inlet pressure and outlet pressure to posi-
tive pressure p
e
≤ 80 hPa (absolute pressure p
abs
≤ 1080 hPa).
• The purge gas is provided at zero pressure at the inlet and extracted at
the outlet (p
e
≥ −100 hPa).
The purge gas flow in operation must be restricted to 10 l/h. The pressure
drop at the flame barriers is approx. 20 hPa with a flow of 10 l/h.
The flameproof cases are specially sealed, so that the purge gas loss during
case purging remains low. The purge gas loss in the EL3060-Uras26 analyzer
unit can be further reduced by inserting the supplied O-ring (Ø 220 × 3 mm)
in the groove provided between the bottom of the case and the case.
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