52 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Process gases
Instrument air
Quality as per ISO 8573-1 Class 2 (max. particle size 1 µm, max.
particle density 1 mg/m
3
, max. oil content 0.1 mg/m
3
, dew
point at least 10 °C below the lowest expected ambient
temperature)
Inlet pressure p
e
= 4000 ± 500 hPa
Flow typically approx. 1800 l/h (1200 l/h for air jet injector and
approx. 600 l/h for housing purge), maximum ap-
prox. 2200 l/h (1500 l/h + 700 l/h)
Combustion air
Quality Synthetic air or catalytically cleaned air with an organic C
content < 1 % of span
Inlet pressure p
e
= 1200 ± 100 hPa
Flow < 20 l/h
Combustion gas
Quality Hydrogen (H
2
),
Quality 5.0
H
2
/He mixture
(40 %/60 %)
Inlet pressure p
e
= 1200 ± 100 hPa p
e
= 1200 ± 100 hPa
Flow ≤ 3 l/h approx. 10 l/h
NOTE
H
2
/He mixture may only be used if the gas analyzer has been ordered and
supplied in the execution specified for this. If the gas analyzer has been sup-
plied in the execution for H
2
/He mixture, H
2
may not be used as a combus-
tion gas under any circumstances. This would cause overheating and there-
fore the destruction of the detector!
CAUTION
A flow restriction and a shut-off valve must be installed in the combustion
gas supply line by the end user, so that safe operation of the gas analyzer
is ensured.
Flow restrictor in the combustion gas supply line
The combustion gas flow must be restricted to a maximum of 10 l/h of H
2
or
25 l/h of H
2
/He mixture. Suitable measures outside the gas analyzer must be
provided by the end user for this purpose.
ABB recommends the use of a bulkhead fitting with an integrated flow re-
strictor which must be installed in the combustion gas supply line. This
bulkhead fitting can be purchased from ABB:
• Combustion gas H
2
: Part number 8329303,
• Combustion gas H
2
/He mixture: Part number 0769359.
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