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Emerson Process Management GmbH & Co. OHG 2-7
2
Installation
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
03/2012
2.3 Installation - Gas Lines
2.3.2 Gas Conditioning
In order to ensure trouble-free operation, spe-
cial attention must be paid to the preparation
of the gases:
All gases must be conditioned
before supplying to the analyzer,
to be
• dry,
• free of dust and
• free of any aggressive com-
ponents which may damage
the gas lines (e.g. by corrosi-
on or solvents) .
Case purge option
The purge medium (e.g. to minimize CO
2
interference or for enhanced safety when
measuring corrosive or poisonous gases)
• must be dry, clean and free of corro-
sives or components containing sol-
vents.
• has to be free of components to be
measured, to minimize cross interfe-
rences.
Its temperature must correspond to the am-
bient temperature of the analyzer, but be at
least within the range 20…35 °C (68…95 °F).
For safety reasons, consider section 2.3.1
when making use of this option!
Open reference option
I
n some cases, the measuring cell has an open
reference side, to be supplied with nitrogen.
This nitrogen
• at least should be of quality 5.0, which
means nitrogen of purity ≥ 99.999 %.
If such gas is not available, the substitute
• must be dry, clean and free of corrosi-
ves or components containing solvents.
• has to be free of components to be
measured, to minimize cross interfe-
rences.
In any case, the gas temperature must cor-
respond to the ambient temperature of the
analyzer, but at least be within the range
20…35 °C (68…95 °F).
Pressure and gas ow must remain within
the values given in the „Measurement
Specications“ section within this manual.
Perform a calibration each time
the source of this gas (e. g.
bottle) has changed!
If moisture cannot be avoided, it is necessary
to ensure that the dew point of the gases is at
least 10 °C (18 °F) below the ambient tempe-
rature to avoid condensate in the gas lines.
Pressure and gas ow must remain within
the values given in the „Measurement
Specications“ section within this manual.
Hints for selected gases
• Calibration gases for CO and NO need
to be moistured by supplying them via a
cooler.