Preparation for Installation 25
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 inert gas 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.
ATTENTION
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
atmospheric conditions in the flameproof case:
· Restriction of the purge gas inlet pressure and outlet pressure to
positive 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
³ –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 (Æ 220 ´ 3 mm) in the groove provided between the bottom of the
case and the case.
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