42/24-12-2 EN Advance Optima Ex Analyzer Modules Operator’s Manual 9
Connect the Gas Lines
F
Follow
• the instructions and notes in the "Analyzer System Installation" and "Gas Line
Connection" chapters of Operator’s Manual 42/24-10 EN,
• the following special instructions and notes as well as
• the notes in the "Electrical Equipment in Explosion Hazard Zones" sections in
the Annex.
Gas Connection
Design
(see Figure 1)
All gas connections – with 1/8-NPT female threads – are routed via flame barriers:
• Sample Gas Inlets and Outlets
• Housing Purge (Option)
• Flowing reference gas for the Uras 14-Ex (Option)
• Pressure sensor for Uras 14-Ex, Magnos 106-Ex (Option) and Caldos 17-Ex
The actual gas connection layout of a delivered Ex analyzer module will be shown
in the applicable analyzer data sheet.
Sample Gas Inlet
Conditions
see “Operating Specifications” section, page 30
CAUTION!
The sample gas must not contain corrosive gases (such as chlorine) that
attack stainless steel.
Special Safety
Measures for
Operation with
Positive Pressure in
the Sample Gas Path
A special version of the Ex analyzer modules is needed for operation with positive
pressure in the sample gas path. This version is identified by the words "Messgas-
druck siehe Besondere Bedingungen" [See Special Conditions for Sample Gas
Pressure] on the identification plate.
When operating with positive pressure in the sample gas path the following special
safety measures should be taken:
• To protect the pressure-tight housing, two additional vent openings (implemented
in the same manner as sample gas flame barriers) are incorporated. Their
internal and external openings must always remain open.
• If the positive pressure at the sample gas outlet and inlet is p
e
< 300 hPa (p
abs
<
1400 hPa), in a failure mode (e.g. if the sample gas line in the analyzer bursts) this
can lead to a sample gas flow from both sides. For this case, steps must be
taken to assure that the total sample gas flow on both sides cannot exceed the
maximum value of 100 l/h.
• To avoid the development of an explosive mixture in the sample gas path, the
latter must be flushed with an inert gas prior to introducing combustible gases.
Uras 14-Ex
The "Flowing Reference Gas" option is not available for the Uras 14-Ex analyzer
module for operation with positive pressure in the sample gas path.
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