26 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Purge curtain / purge gas / pressurized enclosure
Designation of
gas connections
Purge gas inlet: "Analyzer Purge In",
Purge gas outlet: "Analyzer Purge Out"
Purge gas Inert gas (N
2
)
Flow During operation: 15 to 20 l/h, during initial purge: 15 to 40 l/h
Initial purging Manually controlled; initial purge duration:
Limas11 IR, Uras26: 1.6 minutes at min. 15 l/h; Caldos25, Caldos27,
Magnos206: 18 minutes at min. 15 l/h or 7 minutes at min. 40 l/h.
An initial purge is not necessary, if it has been proved that no flammable
sample gas is present in the sample gas path or purge gas path.
Operation A capillary located in the purge gas path monitors that the required positive
pressure of the purge curtain is ≥ 0.5 hPa above that of the sample gas at the
above purge gas flow rates.
Monitoring Compliance with the above purge gas flow rate is monitored in the gas ana-
lyzer. Alarm signal at digital output in accordance with data in the analyzer
data sheet if the minimum flow rate of 15 l/h (corresponds to approx. 7 hPa)
is undershot and the maximum flow rate of 40 l/h (corresponds
to approx. 50 hPa) is overshot.
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