26 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Oxygen sensor
Zero gas:
Quality 3 vol.% O
2
in N
2
(accuracy ±2%)
Inlet pressure p
e
= 1500 ± 100 hPa (1.5 ± 0.1 bar)
Flow rate max. 500 l/h
Span gas:
Quality Clean compressed air (20.96 vol.% O
2
) from the air purifier
Inlet pressure p
e
= 1500 ± 100 hPa (1.5 ± 0.1 bar)
Flow rate max. 500 l/h
Instrument air
Quality On the basis of ISO 8573-1:2001 class 2 (max. particle size 1 to 5 µm, max.
10 particles/m
3
, max. oil content 0.1 mg/m
3
, max. vapor pressure dew point
−40°C)
Inlet pressure p
e
= 5500 to 7000 hPa (5.5 to 7.0 bar)
Flow rate In normal mode 3000 to 3800 l/h, during adjustment briefly up to 5000 l/h
NOTICE Install a pressure controller and a shut-off fitting in the instrument air feed
as close as possible to the installation site of the analyzer cabinet.
Compressed air for back-purging
Quality Instrument air
Inlet pressure max. 6 bar for back-purging,
approx. 4 bar as control air (needed for 2-stage back-purging with Type PFE2
filter unit and with FID)
Flow rate approx. 1600 l/min (duration of the back-purging procedure approx.
45 seconds, see page 159)
NOTICE Compressed air is needed to clean the sampling filter and the probe tube as
well as for controlling the control valves.
Definition
p
e
= p
abs
− p
amb
with p
e
= gauge pressure, p
abs
= absolute pressure, p
amb
=
atmospheric pressure
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